Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2756 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
new file mode 100644
index 0000000000..ac9a406250
--- /dev/null
+++ b/drivers/gpu/drm/drm_modes.c
@@ -0,0 +1,2756 @@
+/*
+ * Copyright © 1997-2003 by The XFree86 Project, Inc.
+ * Copyright © 2007 Dave Airlie
+ * Copyright © 2007-2008 Intel Corporation
+ *   Jesse Barnes <jesse.barnes@intel.com>
+ * Copyright 2005-2006 Luc Verhaegen
+ * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of the copyright holder(s)
+ * and author(s) shall not be used in advertising or otherwise to promote
+ * the sale, use or other dealings in this Software without prior written
+ * authorization from the copyright holder(s) and author(s).
+ */
+
+#include <linux/ctype.h>
+#include <linux/export.h>
+#include <linux/fb.h> /* for KHZ2PICOS() */
+#include <linux/list.h>
+#include <linux/list_sort.h>
+#include <linux/of.h>
+
+#include <video/of_display_timing.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_device.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_print.h>
+
+#include "drm_crtc_internal.h"
+
+/**
+ * drm_mode_debug_printmodeline - print a mode to dmesg
+ * @mode: mode to print
+ *
+ * Describe @mode using DRM_DEBUG.
+ */
+void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
+{
+	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
+}
+EXPORT_SYMBOL(drm_mode_debug_printmodeline);
+
+/**
+ * drm_mode_create - create a new display mode
+ * @dev: DRM device
+ *
+ * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
+ * and return it.
+ *
+ * Returns:
+ * Pointer to new mode on success, NULL on error.
+ */
+struct drm_display_mode *drm_mode_create(struct drm_device *dev)
+{
+	struct drm_display_mode *nmode;
+
+	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
+	if (!nmode)
+		return NULL;
+
+	return nmode;
+}
+EXPORT_SYMBOL(drm_mode_create);
+
+/**
+ * drm_mode_destroy - remove a mode
+ * @dev: DRM device
+ * @mode: mode to remove
+ *
+ * Release @mode's unique ID, then free it @mode structure itself using kfree.
+ */
+void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
+{
+	if (!mode)
+		return;
+
+	kfree(mode);
+}
+EXPORT_SYMBOL(drm_mode_destroy);
+
+/**
+ * drm_mode_probed_add - add a mode to a connector's probed_mode list
+ * @connector: connector the new mode
+ * @mode: mode data
+ *
+ * Add @mode to @connector's probed_mode list for later use. This list should
+ * then in a second step get filtered and all the modes actually supported by
+ * the hardware moved to the @connector's modes list.
+ */
+void drm_mode_probed_add(struct drm_connector *connector,
+			 struct drm_display_mode *mode)
+{
+	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
+
+	list_add_tail(&mode->head, &connector->probed_modes);
+}
+EXPORT_SYMBOL(drm_mode_probed_add);
+
+enum drm_mode_analog {
+	DRM_MODE_ANALOG_NTSC, /* 525 lines, 60Hz */
+	DRM_MODE_ANALOG_PAL, /* 625 lines, 50Hz */
+};
+
+/*
+ * The timings come from:
+ * - https://web.archive.org/web/20220406232708/http://www.kolumbus.fi/pami1/video/pal_ntsc.html
+ * - https://web.archive.org/web/20220406124914/http://martin.hinner.info/vga/pal.html
+ * - https://web.archive.org/web/20220609202433/http://www.batsocks.co.uk/readme/video_timing.htm
+ */
+#define NTSC_LINE_DURATION_NS		63556U
+#define NTSC_LINES_NUMBER		525
+
+#define NTSC_HBLK_DURATION_TYP_NS	10900U
+#define NTSC_HBLK_DURATION_MIN_NS	(NTSC_HBLK_DURATION_TYP_NS - 200)
+#define NTSC_HBLK_DURATION_MAX_NS	(NTSC_HBLK_DURATION_TYP_NS + 200)
+
+#define NTSC_HACT_DURATION_TYP_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_TYP_NS)
+#define NTSC_HACT_DURATION_MIN_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MAX_NS)
+#define NTSC_HACT_DURATION_MAX_NS	(NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MIN_NS)
+
+#define NTSC_HFP_DURATION_TYP_NS	1500
+#define NTSC_HFP_DURATION_MIN_NS	1270
+#define NTSC_HFP_DURATION_MAX_NS	2220
+
+#define NTSC_HSLEN_DURATION_TYP_NS	4700
+#define NTSC_HSLEN_DURATION_MIN_NS	(NTSC_HSLEN_DURATION_TYP_NS - 100)
+#define NTSC_HSLEN_DURATION_MAX_NS	(NTSC_HSLEN_DURATION_TYP_NS + 100)
+
+#define NTSC_HBP_DURATION_TYP_NS	4700
+
+/*
+ * I couldn't find the actual tolerance for the back porch, so let's
+ * just reuse the sync length ones.
+ */
+#define NTSC_HBP_DURATION_MIN_NS	(NTSC_HBP_DURATION_TYP_NS - 100)
+#define NTSC_HBP_DURATION_MAX_NS	(NTSC_HBP_DURATION_TYP_NS + 100)
+
+#define PAL_LINE_DURATION_NS		64000U
+#define PAL_LINES_NUMBER		625
+
+#define PAL_HACT_DURATION_TYP_NS	51950U
+#define PAL_HACT_DURATION_MIN_NS	(PAL_HACT_DURATION_TYP_NS - 100)
+#define PAL_HACT_DURATION_MAX_NS	(PAL_HACT_DURATION_TYP_NS + 400)
+
+#define PAL_HBLK_DURATION_TYP_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_TYP_NS)
+#define PAL_HBLK_DURATION_MIN_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MAX_NS)
+#define PAL_HBLK_DURATION_MAX_NS	(PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MIN_NS)
+
+#define PAL_HFP_DURATION_TYP_NS		1650
+#define PAL_HFP_DURATION_MIN_NS		(PAL_HFP_DURATION_TYP_NS - 100)
+#define PAL_HFP_DURATION_MAX_NS		(PAL_HFP_DURATION_TYP_NS + 400)
+
+#define PAL_HSLEN_DURATION_TYP_NS	4700
+#define PAL_HSLEN_DURATION_MIN_NS	(PAL_HSLEN_DURATION_TYP_NS - 200)
+#define PAL_HSLEN_DURATION_MAX_NS	(PAL_HSLEN_DURATION_TYP_NS + 200)
+
+#define PAL_HBP_DURATION_TYP_NS		5700
+#define PAL_HBP_DURATION_MIN_NS		(PAL_HBP_DURATION_TYP_NS - 200)
+#define PAL_HBP_DURATION_MAX_NS		(PAL_HBP_DURATION_TYP_NS + 200)
+
+struct analog_param_field {
+	unsigned int even, odd;
+};
+
+#define PARAM_FIELD(_odd, _even)		\
+	{ .even = _even, .odd = _odd }
+
+struct analog_param_range {
+	unsigned int	min, typ, max;
+};
+
+#define PARAM_RANGE(_min, _typ, _max)		\
+	{ .min = _min, .typ = _typ, .max = _max }
+
+struct analog_parameters {
+	unsigned int			num_lines;
+	unsigned int			line_duration_ns;
+
+	struct analog_param_range	hact_ns;
+	struct analog_param_range	hfp_ns;
+	struct analog_param_range	hslen_ns;
+	struct analog_param_range	hbp_ns;
+	struct analog_param_range	hblk_ns;
+
+	unsigned int			bt601_hfp;
+
+	struct analog_param_field	vfp_lines;
+	struct analog_param_field	vslen_lines;
+	struct analog_param_field	vbp_lines;
+};
+
+#define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp,	\
+			  _hslen, _hbp, _hblk, _bt601_hfp, _vfp,	\
+			  _vslen, _vbp)					\
+	[_mode] = {							\
+		.num_lines = _lines,					\
+		.line_duration_ns = _line_dur,				\
+		.hact_ns = _hact,					\
+		.hfp_ns = _hfp,						\
+		.hslen_ns = _hslen,					\
+		.hbp_ns = _hbp,						\
+		.hblk_ns = _hblk,					\
+		.bt601_hfp = _bt601_hfp,				\
+		.vfp_lines = _vfp,					\
+		.vslen_lines = _vslen,					\
+		.vbp_lines = _vbp,					\
+	}
+
+static const struct analog_parameters tv_modes_parameters[] = {
+	TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC,
+			  NTSC_LINES_NUMBER,
+			  NTSC_LINE_DURATION_NS,
+			  PARAM_RANGE(NTSC_HACT_DURATION_MIN_NS,
+				      NTSC_HACT_DURATION_TYP_NS,
+				      NTSC_HACT_DURATION_MAX_NS),
+			  PARAM_RANGE(NTSC_HFP_DURATION_MIN_NS,
+				      NTSC_HFP_DURATION_TYP_NS,
+				      NTSC_HFP_DURATION_MAX_NS),
+			  PARAM_RANGE(NTSC_HSLEN_DURATION_MIN_NS,
+				      NTSC_HSLEN_DURATION_TYP_NS,
+				      NTSC_HSLEN_DURATION_MAX_NS),
+			  PARAM_RANGE(NTSC_HBP_DURATION_MIN_NS,
+				      NTSC_HBP_DURATION_TYP_NS,
+				      NTSC_HBP_DURATION_MAX_NS),
+			  PARAM_RANGE(NTSC_HBLK_DURATION_MIN_NS,
+				      NTSC_HBLK_DURATION_TYP_NS,
+				      NTSC_HBLK_DURATION_MAX_NS),
+			  16,
+			  PARAM_FIELD(3, 3),
+			  PARAM_FIELD(3, 3),
+			  PARAM_FIELD(16, 17)),
+	TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL,
+			  PAL_LINES_NUMBER,
+			  PAL_LINE_DURATION_NS,
+			  PARAM_RANGE(PAL_HACT_DURATION_MIN_NS,
+				      PAL_HACT_DURATION_TYP_NS,
+				      PAL_HACT_DURATION_MAX_NS),
+			  PARAM_RANGE(PAL_HFP_DURATION_MIN_NS,
+				      PAL_HFP_DURATION_TYP_NS,
+				      PAL_HFP_DURATION_MAX_NS),
+			  PARAM_RANGE(PAL_HSLEN_DURATION_MIN_NS,
+				      PAL_HSLEN_DURATION_TYP_NS,
+				      PAL_HSLEN_DURATION_MAX_NS),
+			  PARAM_RANGE(PAL_HBP_DURATION_MIN_NS,
+				      PAL_HBP_DURATION_TYP_NS,
+				      PAL_HBP_DURATION_MAX_NS),
+			  PARAM_RANGE(PAL_HBLK_DURATION_MIN_NS,
+				      PAL_HBLK_DURATION_TYP_NS,
+				      PAL_HBLK_DURATION_MAX_NS),
+			  12,
+
+			  /*
+			   * The front porch is actually 6 short sync
+			   * pulses for the even field, and 5 for the
+			   * odd field. Each sync takes half a life so
+			   * the odd field front porch is shorter by
+			   * half a line.
+			   *
+			   * In progressive, we're supposed to use 6
+			   * pulses, so we're fine there
+			   */
+			  PARAM_FIELD(3, 2),
+
+			  /*
+			   * The vsync length is 5 long sync pulses,
+			   * each field taking half a line. We're
+			   * shorter for both fields by half a line.
+			   *
+			   * In progressive, we're supposed to use 5
+			   * pulses, so we're off by half
+			   * a line.
+			   *
+			   * In interlace, we're now off by half a line
+			   * for the even field and one line for the odd
+			   * field.
+			   */
+			  PARAM_FIELD(3, 3),
+
+			  /*
+			   * The back porch starts with post-equalizing
+			   * pulses, consisting in 5 short sync pulses
+			   * for the even field, 4 for the odd field. In
+			   * progressive, it's 5 short syncs.
+			   *
+			   * In progressive, we thus have 2.5 lines,
+			   * plus the 0.5 line we were missing
+			   * previously, so we should use 3 lines.
+			   *
+			   * In interlace, the even field is in the
+			   * exact same case than progressive. For the
+			   * odd field, we should be using 2 lines but
+			   * we're one line short, so we'll make up for
+			   * it here by using 3.
+			   *
+			   * The entire blanking area is supposed to
+			   * take 25 lines, so we also need to account
+			   * for the rest of the blanking area that
+			   * can't be in either the front porch or sync
+			   * period.
+			   */
+			  PARAM_FIELD(19, 20)),
+};
+
+static int fill_analog_mode(struct drm_device *dev,
+			    struct drm_display_mode *mode,
+			    const struct analog_parameters *params,
+			    unsigned long pixel_clock_hz,
+			    unsigned int hactive,
+			    unsigned int vactive,
+			    bool interlace)
+{
+	unsigned long pixel_duration_ns = NSEC_PER_SEC / pixel_clock_hz;
+	unsigned int htotal, vtotal;
+	unsigned int max_hact, hact_duration_ns;
+	unsigned int hblk, hblk_duration_ns;
+	unsigned int hfp, hfp_duration_ns;
+	unsigned int hslen, hslen_duration_ns;
+	unsigned int hbp, hbp_duration_ns;
+	unsigned int porches, porches_duration_ns;
+	unsigned int vfp, vfp_min;
+	unsigned int vbp, vbp_min;
+	unsigned int vslen;
+	bool bt601 = false;
+	int porches_rem;
+	u64 result;
+
+	drm_dbg_kms(dev,
+		    "Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n",
+		    hactive, vactive,
+		    interlace ? 'i' : 'p',
+		    params->num_lines,
+		    pixel_clock_hz / 1000);
+
+	max_hact = params->hact_ns.max / pixel_duration_ns;
+	if (pixel_clock_hz == 13500000 && hactive > max_hact && hactive <= 720) {
+		drm_dbg_kms(dev, "Trying to generate a BT.601 mode. Disabling checks.\n");
+		bt601 = true;
+	}
+
+	/*
+	 * Our pixel duration is going to be round down by the division,
+	 * so rounding up is probably going to introduce even more
+	 * deviation.
+	 */
+	result = (u64)params->line_duration_ns * pixel_clock_hz;
+	do_div(result, NSEC_PER_SEC);
+	htotal = result;
+
+	drm_dbg_kms(dev, "Total Horizontal Number of Pixels: %u\n", htotal);
+
+	hact_duration_ns = hactive * pixel_duration_ns;
+	if (!bt601 &&
+	    (hact_duration_ns < params->hact_ns.min ||
+	     hact_duration_ns > params->hact_ns.max)) {
+		DRM_ERROR("Invalid horizontal active area duration: %uns (min: %u, max %u)\n",
+			  hact_duration_ns, params->hact_ns.min, params->hact_ns.max);
+		return -EINVAL;
+	}
+
+	hblk = htotal - hactive;
+	drm_dbg_kms(dev, "Horizontal Blanking Period: %u\n", hblk);
+
+	hblk_duration_ns = hblk * pixel_duration_ns;
+	if (!bt601 &&
+	    (hblk_duration_ns < params->hblk_ns.min ||
+	     hblk_duration_ns > params->hblk_ns.max)) {
+		DRM_ERROR("Invalid horizontal blanking duration: %uns (min: %u, max %u)\n",
+			  hblk_duration_ns, params->hblk_ns.min, params->hblk_ns.max);
+		return -EINVAL;
+	}
+
+	hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns);
+	drm_dbg_kms(dev, "Horizontal Sync Period: %u\n", hslen);
+
+	hslen_duration_ns = hslen * pixel_duration_ns;
+	if (!bt601 &&
+	    (hslen_duration_ns < params->hslen_ns.min ||
+	     hslen_duration_ns > params->hslen_ns.max)) {
+		DRM_ERROR("Invalid horizontal sync duration: %uns (min: %u, max %u)\n",
+			  hslen_duration_ns, params->hslen_ns.min, params->hslen_ns.max);
+		return -EINVAL;
+	}
+
+	porches = hblk - hslen;
+	drm_dbg_kms(dev, "Remaining horizontal pixels for both porches: %u\n", porches);
+
+	porches_duration_ns = porches * pixel_duration_ns;
+	if (!bt601 &&
+	    (porches_duration_ns > (params->hfp_ns.max + params->hbp_ns.max) ||
+	     porches_duration_ns < (params->hfp_ns.min + params->hbp_ns.min))) {
+		DRM_ERROR("Invalid horizontal porches duration: %uns\n", porches_duration_ns);
+		return -EINVAL;
+	}
+
+	if (bt601) {
+		hfp = params->bt601_hfp;
+	} else {
+		unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min,
+						    pixel_duration_ns);
+		unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min,
+						    pixel_duration_ns);
+		int porches_rem = porches - hfp_min - hbp_min;
+
+		hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
+	}
+
+	drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp);
+
+	hfp_duration_ns = hfp * pixel_duration_ns;
+	if (!bt601 &&
+	    (hfp_duration_ns < params->hfp_ns.min ||
+	     hfp_duration_ns > params->hfp_ns.max)) {
+		DRM_ERROR("Invalid horizontal front porch duration: %uns (min: %u, max %u)\n",
+			  hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max);
+		return -EINVAL;
+	}
+
+	hbp = porches - hfp;
+	drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp);
+
+	hbp_duration_ns = hbp * pixel_duration_ns;
+	if (!bt601 &&
+	    (hbp_duration_ns < params->hbp_ns.min ||
+	     hbp_duration_ns > params->hbp_ns.max)) {
+		DRM_ERROR("Invalid horizontal back porch duration: %uns (min: %u, max %u)\n",
+			  hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max);
+		return -EINVAL;
+	}
+
+	if (htotal != (hactive + hfp + hslen + hbp))
+		return -EINVAL;
+
+	mode->clock = pixel_clock_hz / 1000;
+	mode->hdisplay = hactive;
+	mode->hsync_start = mode->hdisplay + hfp;
+	mode->hsync_end = mode->hsync_start + hslen;
+	mode->htotal = mode->hsync_end + hbp;
+
+	if (interlace) {
+		vfp_min = params->vfp_lines.even + params->vfp_lines.odd;
+		vbp_min = params->vbp_lines.even + params->vbp_lines.odd;
+		vslen = params->vslen_lines.even + params->vslen_lines.odd;
+	} else {
+		/*
+		 * By convention, NTSC (aka 525/60) systems start with
+		 * the even field, but PAL (aka 625/50) systems start
+		 * with the odd one.
+		 *
+		 * PAL systems also have asymmetric timings between the
+		 * even and odd field, while NTSC is symmetric.
+		 *
+		 * Moreover, if we want to create a progressive mode for
+		 * PAL, we need to use the odd field timings.
+		 *
+		 * Since odd == even for NTSC, we can just use the odd
+		 * one all the time to simplify the code a bit.
+		 */
+		vfp_min = params->vfp_lines.odd;
+		vbp_min = params->vbp_lines.odd;
+		vslen = params->vslen_lines.odd;
+	}
+
+	drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen);
+
+	porches = params->num_lines - vactive - vslen;
+	drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches);
+
+	porches_rem = porches - vfp_min - vbp_min;
+	vfp = vfp_min + (porches_rem / 2);
+	drm_dbg_kms(dev, "Vertical Front Porch: %u\n", vfp);
+
+	vbp = porches - vfp;
+	drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp);
+
+	vtotal = vactive + vfp + vslen + vbp;
+	if (params->num_lines != vtotal) {
+		DRM_ERROR("Invalid vertical total: %upx (expected %upx)\n",
+			  vtotal, params->num_lines);
+		return -EINVAL;
+	}
+
+	mode->vdisplay = vactive;
+	mode->vsync_start = mode->vdisplay + vfp;
+	mode->vsync_end = mode->vsync_start + vslen;
+	mode->vtotal = mode->vsync_end + vbp;
+
+	if (mode->vtotal != params->num_lines)
+		return -EINVAL;
+
+	mode->type = DRM_MODE_TYPE_DRIVER;
+	mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
+	if (interlace)
+		mode->flags |= DRM_MODE_FLAG_INTERLACE;
+
+	drm_mode_set_name(mode);
+
+	drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
+
+	return 0;
+}
+
+/**
+ * drm_analog_tv_mode - create a display mode for an analog TV
+ * @dev: drm device
+ * @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*.
+ * @pixel_clock_hz: Pixel Clock Frequency, in Hertz
+ * @hdisplay: hdisplay size
+ * @vdisplay: vdisplay size
+ * @interlace: whether to compute an interlaced mode
+ *
+ * This function creates a struct drm_display_mode instance suited for
+ * an analog TV output, for one of the usual analog TV mode.
+ *
+ * Note that @hdisplay is larger than the usual constraints for the PAL
+ * and NTSC timings, and we'll choose to ignore most timings constraints
+ * to reach those resolutions.
+ *
+ * Returns:
+ *
+ * A pointer to the mode, allocated with drm_mode_create(). Returns NULL
+ * on error.
+ */
+struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
+					    enum drm_connector_tv_mode tv_mode,
+					    unsigned long pixel_clock_hz,
+					    unsigned int hdisplay,
+					    unsigned int vdisplay,
+					    bool interlace)
+{
+	struct drm_display_mode *mode;
+	enum drm_mode_analog analog;
+	int ret;
+
+	switch (tv_mode) {
+	case DRM_MODE_TV_MODE_NTSC:
+		fallthrough;
+	case DRM_MODE_TV_MODE_NTSC_443:
+		fallthrough;
+	case DRM_MODE_TV_MODE_NTSC_J:
+		fallthrough;
+	case DRM_MODE_TV_MODE_PAL_M:
+		analog = DRM_MODE_ANALOG_NTSC;
+		break;
+
+	case DRM_MODE_TV_MODE_PAL:
+		fallthrough;
+	case DRM_MODE_TV_MODE_PAL_N:
+		fallthrough;
+	case DRM_MODE_TV_MODE_SECAM:
+		analog = DRM_MODE_ANALOG_PAL;
+		break;
+
+	default:
+		return NULL;
+	}
+
+	mode = drm_mode_create(dev);
+	if (!mode)
+		return NULL;
+
+	ret = fill_analog_mode(dev, mode,
+			       &tv_modes_parameters[analog],
+			       pixel_clock_hz, hdisplay, vdisplay, interlace);
+	if (ret)
+		goto err_free_mode;
+
+	return mode;
+
+err_free_mode:
+	drm_mode_destroy(dev, mode);
+	return NULL;
+}
+EXPORT_SYMBOL(drm_analog_tv_mode);
+
+/**
+ * drm_cvt_mode -create a modeline based on the CVT algorithm
+ * @dev: drm device
+ * @hdisplay: hdisplay size
+ * @vdisplay: vdisplay size
+ * @vrefresh: vrefresh rate
+ * @reduced: whether to use reduced blanking
+ * @interlaced: whether to compute an interlaced mode
+ * @margins: whether to add margins (borders)
+ *
+ * This function is called to generate the modeline based on CVT algorithm
+ * according to the hdisplay, vdisplay, vrefresh.
+ * It is based from the VESA(TM) Coordinated Video Timing Generator by
+ * Graham Loveridge April 9, 2003 available at
+ * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
+ *
+ * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
+ * What I have done is to translate it by using integer calculation.
+ *
+ * Returns:
+ * The modeline based on the CVT algorithm stored in a drm_display_mode object.
+ * The display mode object is allocated with drm_mode_create(). Returns NULL
+ * when no mode could be allocated.
+ */
+struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
+				      int vdisplay, int vrefresh,
+				      bool reduced, bool interlaced, bool margins)
+{
+#define HV_FACTOR			1000
+	/* 1) top/bottom margin size (% of height) - default: 1.8, */
+#define	CVT_MARGIN_PERCENTAGE		18
+	/* 2) character cell horizontal granularity (pixels) - default 8 */
+#define	CVT_H_GRANULARITY		8
+	/* 3) Minimum vertical porch (lines) - default 3 */
+#define	CVT_MIN_V_PORCH			3
+	/* 4) Minimum number of vertical back porch lines - default 6 */
+#define	CVT_MIN_V_BPORCH		6
+	/* Pixel Clock step (kHz) */
+#define CVT_CLOCK_STEP			250
+	struct drm_display_mode *drm_mode;
+	unsigned int vfieldrate, hperiod;
+	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
+	int interlace;
+	u64 tmp;
+
+	if (!hdisplay || !vdisplay)
+		return NULL;
+
+	/* allocate the drm_display_mode structure. If failure, we will
+	 * return directly
+	 */
+	drm_mode = drm_mode_create(dev);
+	if (!drm_mode)
+		return NULL;
+
+	/* the CVT default refresh rate is 60Hz */
+	if (!vrefresh)
+		vrefresh = 60;
+
+	/* the required field fresh rate */
+	if (interlaced)
+		vfieldrate = vrefresh * 2;
+	else
+		vfieldrate = vrefresh;
+
+	/* horizontal pixels */
+	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
+
+	/* determine the left&right borders */
+	hmargin = 0;
+	if (margins) {
+		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
+		hmargin -= hmargin % CVT_H_GRANULARITY;
+	}
+	/* find the total active pixels */
+	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
+
+	/* find the number of lines per field */
+	if (interlaced)
+		vdisplay_rnd = vdisplay / 2;
+	else
+		vdisplay_rnd = vdisplay;
+
+	/* find the top & bottom borders */
+	vmargin = 0;
+	if (margins)
+		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
+
+	drm_mode->vdisplay = vdisplay + 2 * vmargin;
+
+	/* Interlaced */
+	if (interlaced)
+		interlace = 1;
+	else
+		interlace = 0;
+
+	/* Determine VSync Width from aspect ratio */
+	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
+		vsync = 4;
+	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
+		vsync = 5;
+	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
+		vsync = 6;
+	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
+		vsync = 7;
+	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
+		vsync = 7;
+	else /* custom */
+		vsync = 10;
+
+	if (!reduced) {
+		/* simplify the GTF calculation */
+		/* 4) Minimum time of vertical sync + back porch interval (µs)
+		 * default 550.0
+		 */
+		int tmp1, tmp2;
+#define CVT_MIN_VSYNC_BP	550
+		/* 3) Nominal HSync width (% of line period) - default 8 */
+#define CVT_HSYNC_PERCENTAGE	8
+		unsigned int hblank_percentage;
+		int vsyncandback_porch, __maybe_unused vback_porch, hblank;
+
+		/* estimated the horizontal period */
+		tmp1 = HV_FACTOR * 1000000  -
+				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
+		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
+				interlace;
+		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
+
+		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
+		/* 9. Find number of lines in sync + backporch */
+		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
+			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
+		else
+			vsyncandback_porch = tmp1;
+		/* 10. Find number of lines in back porch */
+		vback_porch = vsyncandback_porch - vsync;
+		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
+				vsyncandback_porch + CVT_MIN_V_PORCH;
+		/* 5) Definition of Horizontal blanking time limitation */
+		/* Gradient (%/kHz) - default 600 */
+#define CVT_M_FACTOR	600
+		/* Offset (%) - default 40 */
+#define CVT_C_FACTOR	40
+		/* Blanking time scaling factor - default 128 */
+#define CVT_K_FACTOR	128
+		/* Scaling factor weighting - default 20 */
+#define CVT_J_FACTOR	20
+#define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
+#define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
+			 CVT_J_FACTOR)
+		/* 12. Find ideal blanking duty cycle from formula */
+		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
+					hperiod / 1000;
+		/* 13. Blanking time */
+		if (hblank_percentage < 20 * HV_FACTOR)
+			hblank_percentage = 20 * HV_FACTOR;
+		hblank = drm_mode->hdisplay * hblank_percentage /
+			 (100 * HV_FACTOR - hblank_percentage);
+		hblank -= hblank % (2 * CVT_H_GRANULARITY);
+		/* 14. find the total pixels per line */
+		drm_mode->htotal = drm_mode->hdisplay + hblank;
+		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
+		drm_mode->hsync_start = drm_mode->hsync_end -
+			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
+		drm_mode->hsync_start += CVT_H_GRANULARITY -
+			drm_mode->hsync_start % CVT_H_GRANULARITY;
+		/* fill the Vsync values */
+		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
+		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
+	} else {
+		/* Reduced blanking */
+		/* Minimum vertical blanking interval time (µs)- default 460 */
+#define CVT_RB_MIN_VBLANK	460
+		/* Fixed number of clocks for horizontal sync */
+#define CVT_RB_H_SYNC		32
+		/* Fixed number of clocks for horizontal blanking */
+#define CVT_RB_H_BLANK		160
+		/* Fixed number of lines for vertical front porch - default 3*/
+#define CVT_RB_VFPORCH		3
+		int vbilines;
+		int tmp1, tmp2;
+		/* 8. Estimate Horizontal period. */
+		tmp1 = HV_FACTOR * 1000000 -
+			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
+		tmp2 = vdisplay_rnd + 2 * vmargin;
+		hperiod = tmp1 / (tmp2 * vfieldrate);
+		/* 9. Find number of lines in vertical blanking */
+		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
+		/* 10. Check if vertical blanking is sufficient */
+		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
+			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
+		/* 11. Find total number of lines in vertical field */
+		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
+		/* 12. Find total number of pixels in a line */
+		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
+		/* Fill in HSync values */
+		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
+		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
+		/* Fill in VSync values */
+		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
+		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
+	}
+	/* 15/13. Find pixel clock frequency (kHz for xf86) */
+	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
+	tmp *= HV_FACTOR * 1000;
+	do_div(tmp, hperiod);
+	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
+	drm_mode->clock = tmp;
+	/* 18/16. Find actual vertical frame frequency */
+	/* ignore - just set the mode flag for interlaced */
+	if (interlaced) {
+		drm_mode->vtotal *= 2;
+		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
+	}
+	/* Fill the mode line name */
+	drm_mode_set_name(drm_mode);
+	if (reduced)
+		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
+					DRM_MODE_FLAG_NVSYNC);
+	else
+		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
+					DRM_MODE_FLAG_NHSYNC);
+
+	return drm_mode;
+}
+EXPORT_SYMBOL(drm_cvt_mode);
+
+/**
+ * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
+ * @dev: drm device
+ * @hdisplay: hdisplay size
+ * @vdisplay: vdisplay size
+ * @vrefresh: vrefresh rate.
+ * @interlaced: whether to compute an interlaced mode
+ * @margins: desired margin (borders) size
+ * @GTF_M: extended GTF formula parameters
+ * @GTF_2C: extended GTF formula parameters
+ * @GTF_K: extended GTF formula parameters
+ * @GTF_2J: extended GTF formula parameters
+ *
+ * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
+ * in here multiplied by two.  For a C of 40, pass in 80.
+ *
+ * Returns:
+ * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
+ * The display mode object is allocated with drm_mode_create(). Returns NULL
+ * when no mode could be allocated.
+ */
+struct drm_display_mode *
+drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
+		     int vrefresh, bool interlaced, int margins,
+		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
+{	/* 1) top/bottom margin size (% of height) - default: 1.8, */
+#define	GTF_MARGIN_PERCENTAGE		18
+	/* 2) character cell horizontal granularity (pixels) - default 8 */
+#define	GTF_CELL_GRAN			8
+	/* 3) Minimum vertical porch (lines) - default 3 */
+#define	GTF_MIN_V_PORCH			1
+	/* width of vsync in lines */
+#define V_SYNC_RQD			3
+	/* width of hsync as % of total line */
+#define H_SYNC_PERCENT			8
+	/* min time of vsync + back porch (microsec) */
+#define MIN_VSYNC_PLUS_BP		550
+	/* C' and M' are part of the Blanking Duty Cycle computation */
+#define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
+#define GTF_M_PRIME	(GTF_K * GTF_M / 256)
+	struct drm_display_mode *drm_mode;
+	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
+	int top_margin, bottom_margin;
+	int interlace;
+	unsigned int hfreq_est;
+	int vsync_plus_bp, __maybe_unused vback_porch;
+	unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
+	unsigned int __maybe_unused hperiod;
+	unsigned int vfield_rate, __maybe_unused vframe_rate;
+	int left_margin, right_margin;
+	unsigned int total_active_pixels, ideal_duty_cycle;
+	unsigned int hblank, total_pixels, pixel_freq;
+	int hsync, hfront_porch, vodd_front_porch_lines;
+	unsigned int tmp1, tmp2;
+
+	if (!hdisplay || !vdisplay)
+		return NULL;
+
+	drm_mode = drm_mode_create(dev);
+	if (!drm_mode)
+		return NULL;
+
+	/* 1. In order to give correct results, the number of horizontal
+	 * pixels requested is first processed to ensure that it is divisible
+	 * by the character size, by rounding it to the nearest character
+	 * cell boundary:
+	 */
+	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
+	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
+
+	/* 2. If interlace is requested, the number of vertical lines assumed
+	 * by the calculation must be halved, as the computation calculates
+	 * the number of vertical lines per field.
+	 */
+	if (interlaced)
+		vdisplay_rnd = vdisplay / 2;
+	else
+		vdisplay_rnd = vdisplay;
+
+	/* 3. Find the frame rate required: */
+	if (interlaced)
+		vfieldrate_rqd = vrefresh * 2;
+	else
+		vfieldrate_rqd = vrefresh;
+
+	/* 4. Find number of lines in Top margin: */
+	top_margin = 0;
+	if (margins)
+		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
+				1000;
+	/* 5. Find number of lines in bottom margin: */
+	bottom_margin = top_margin;
+
+	/* 6. If interlace is required, then set variable interlace: */
+	if (interlaced)
+		interlace = 1;
+	else
+		interlace = 0;
+
+	/* 7. Estimate the Horizontal frequency */
+	{
+		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
+		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
+				2 + interlace;
+		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
+	}
+
+	/* 8. Find the number of lines in V sync + back porch */
+	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
+	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
+	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
+	/*  9. Find the number of lines in V back porch alone: */
+	vback_porch = vsync_plus_bp - V_SYNC_RQD;
+	/*  10. Find the total number of lines in Vertical field period: */
+	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
+			vsync_plus_bp + GTF_MIN_V_PORCH;
+	/*  11. Estimate the Vertical field frequency: */
+	vfieldrate_est = hfreq_est / vtotal_lines;
+	/*  12. Find the actual horizontal period: */
+	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
+
+	/*  13. Find the actual Vertical field frequency: */
+	vfield_rate = hfreq_est / vtotal_lines;
+	/*  14. Find the Vertical frame frequency: */
+	if (interlaced)
+		vframe_rate = vfield_rate / 2;
+	else
+		vframe_rate = vfield_rate;
+	/*  15. Find number of pixels in left margin: */
+	if (margins)
+		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
+				1000;
+	else
+		left_margin = 0;
+
+	/* 16.Find number of pixels in right margin: */
+	right_margin = left_margin;
+	/* 17.Find total number of active pixels in image and left and right */
+	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
+	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
+	ideal_duty_cycle = GTF_C_PRIME * 1000 -
+				(GTF_M_PRIME * 1000000 / hfreq_est);
+	/* 19.Find the number of pixels in the blanking time to the nearest
+	 * double character cell: */
+	hblank = total_active_pixels * ideal_duty_cycle /
+			(100000 - ideal_duty_cycle);
+	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
+	hblank = hblank * 2 * GTF_CELL_GRAN;
+	/* 20.Find total number of pixels: */
+	total_pixels = total_active_pixels + hblank;
+	/* 21.Find pixel clock frequency: */
+	pixel_freq = total_pixels * hfreq_est / 1000;
+	/* Stage 1 computations are now complete; I should really pass
+	 * the results to another function and do the Stage 2 computations,
+	 * but I only need a few more values so I'll just append the
+	 * computations here for now */
+	/* 17. Find the number of pixels in the horizontal sync period: */
+	hsync = H_SYNC_PERCENT * total_pixels / 100;
+	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
+	hsync = hsync * GTF_CELL_GRAN;
+	/* 18. Find the number of pixels in horizontal front porch period */
+	hfront_porch = hblank / 2 - hsync;
+	/*  36. Find the number of lines in the odd front porch period: */
+	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
+
+	/* finally, pack the results in the mode struct */
+	drm_mode->hdisplay = hdisplay_rnd;
+	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
+	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
+	drm_mode->htotal = total_pixels;
+	drm_mode->vdisplay = vdisplay_rnd;
+	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
+	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
+	drm_mode->vtotal = vtotal_lines;
+
+	drm_mode->clock = pixel_freq;
+
+	if (interlaced) {
+		drm_mode->vtotal *= 2;
+		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
+	}
+
+	drm_mode_set_name(drm_mode);
+	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
+		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
+	else
+		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
+
+	return drm_mode;
+}
+EXPORT_SYMBOL(drm_gtf_mode_complex);
+
+/**
+ * drm_gtf_mode - create the modeline based on the GTF algorithm
+ * @dev: drm device
+ * @hdisplay: hdisplay size
+ * @vdisplay: vdisplay size
+ * @vrefresh: vrefresh rate.
+ * @interlaced: whether to compute an interlaced mode
+ * @margins: desired margin (borders) size
+ *
+ * return the modeline based on GTF algorithm
+ *
+ * This function is to create the modeline based on the GTF algorithm.
+ * Generalized Timing Formula is derived from:
+ *
+ *	GTF Spreadsheet by Andy Morrish (1/5/97)
+ *	available at https://www.vesa.org
+ *
+ * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
+ * What I have done is to translate it by using integer calculation.
+ * I also refer to the function of fb_get_mode in the file of
+ * drivers/video/fbmon.c
+ *
+ * Standard GTF parameters::
+ *
+ *     M = 600
+ *     C = 40
+ *     K = 128
+ *     J = 20
+ *
+ * Returns:
+ * The modeline based on the GTF algorithm stored in a drm_display_mode object.
+ * The display mode object is allocated with drm_mode_create(). Returns NULL
+ * when no mode could be allocated.
+ */
+struct drm_display_mode *
+drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
+	     bool interlaced, int margins)
+{
+	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
+				    interlaced, margins,
+				    600, 40 * 2, 128, 20 * 2);
+}
+EXPORT_SYMBOL(drm_gtf_mode);
+
+#ifdef CONFIG_VIDEOMODE_HELPERS
+/**
+ * drm_display_mode_from_videomode - fill in @dmode using @vm,
+ * @vm: videomode structure to use as source
+ * @dmode: drm_display_mode structure to use as destination
+ *
+ * Fills out @dmode using the display mode specified in @vm.
+ */
+void drm_display_mode_from_videomode(const struct videomode *vm,
+				     struct drm_display_mode *dmode)
+{
+	dmode->hdisplay = vm->hactive;
+	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
+	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
+	dmode->htotal = dmode->hsync_end + vm->hback_porch;
+
+	dmode->vdisplay = vm->vactive;
+	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
+	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
+	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
+
+	dmode->clock = vm->pixelclock / 1000;
+
+	dmode->flags = 0;
+	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
+		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
+	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
+		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
+	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
+		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
+	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
+		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
+	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
+		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
+	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
+		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
+	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
+		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
+	drm_mode_set_name(dmode);
+}
+EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
+
+/**
+ * drm_display_mode_to_videomode - fill in @vm using @dmode,
+ * @dmode: drm_display_mode structure to use as source
+ * @vm: videomode structure to use as destination
+ *
+ * Fills out @vm using the display mode specified in @dmode.
+ */
+void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
+				   struct videomode *vm)
+{
+	vm->hactive = dmode->hdisplay;
+	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
+	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
+	vm->hback_porch = dmode->htotal - dmode->hsync_end;
+
+	vm->vactive = dmode->vdisplay;
+	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
+	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
+	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
+
+	vm->pixelclock = dmode->clock * 1000;
+
+	vm->flags = 0;
+	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
+		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
+	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
+		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
+	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
+		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
+	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
+		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
+	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
+		vm->flags |= DISPLAY_FLAGS_INTERLACED;
+	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
+		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
+	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
+		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
+}
+EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
+
+/**
+ * drm_bus_flags_from_videomode - extract information about pixelclk and
+ * DE polarity from videomode and store it in a separate variable
+ * @vm: videomode structure to use
+ * @bus_flags: information about pixelclk, sync and DE polarity will be stored
+ * here
+ *
+ * Sets DRM_BUS_FLAG_DE_(LOW|HIGH),  DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
+ * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
+ * found in @vm
+ */
+void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
+{
+	*bus_flags = 0;
+	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
+		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
+	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
+
+	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
+		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
+	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
+		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
+
+	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
+		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
+	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
+		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
+}
+EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
+
+#ifdef CONFIG_OF
+/**
+ * of_get_drm_display_mode - get a drm_display_mode from devicetree
+ * @np: device_node with the timing specification
+ * @dmode: will be set to the return value
+ * @bus_flags: information about pixelclk, sync and DE polarity
+ * @index: index into the list of display timings in devicetree
+ *
+ * This function is expensive and should only be used, if only one mode is to be
+ * read from DT. To get multiple modes start with of_get_display_timings and
+ * work with that instead.
+ *
+ * Returns:
+ * 0 on success, a negative errno code when no of videomode node was found.
+ */
+int of_get_drm_display_mode(struct device_node *np,
+			    struct drm_display_mode *dmode, u32 *bus_flags,
+			    int index)
+{
+	struct videomode vm;
+	int ret;
+
+	ret = of_get_videomode(np, &vm, index);
+	if (ret)
+		return ret;
+
+	drm_display_mode_from_videomode(&vm, dmode);
+	if (bus_flags)
+		drm_bus_flags_from_videomode(&vm, bus_flags);
+
+	pr_debug("%pOF: got %dx%d display mode\n",
+		np, vm.hactive, vm.vactive);
+	drm_mode_debug_printmodeline(dmode);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
+
+/**
+ * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
+ * @np: device_node with the panel-timing specification
+ * @dmode: will be set to the return value
+ * @bus_flags: information about pixelclk, sync and DE polarity
+ *
+ * The mandatory Device Tree properties width-mm and height-mm
+ * are read and set on the display mode.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int of_get_drm_panel_display_mode(struct device_node *np,
+				  struct drm_display_mode *dmode, u32 *bus_flags)
+{
+	u32 width_mm = 0, height_mm = 0;
+	struct display_timing timing;
+	struct videomode vm;
+	int ret;
+
+	ret = of_get_display_timing(np, "panel-timing", &timing);
+	if (ret)
+		return ret;
+
+	videomode_from_timing(&timing, &vm);
+
+	memset(dmode, 0, sizeof(*dmode));
+	drm_display_mode_from_videomode(&vm, dmode);
+	if (bus_flags)
+		drm_bus_flags_from_videomode(&vm, bus_flags);
+
+	ret = of_property_read_u32(np, "width-mm", &width_mm);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32(np, "height-mm", &height_mm);
+	if (ret)
+		return ret;
+
+	dmode->width_mm = width_mm;
+	dmode->height_mm = height_mm;
+
+	drm_mode_debug_printmodeline(dmode);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
+#endif /* CONFIG_OF */
+#endif /* CONFIG_VIDEOMODE_HELPERS */
+
+/**
+ * drm_mode_set_name - set the name on a mode
+ * @mode: name will be set in this mode
+ *
+ * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
+ * with an optional 'i' suffix for interlaced modes.
+ */
+void drm_mode_set_name(struct drm_display_mode *mode)
+{
+	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
+
+	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
+		 mode->hdisplay, mode->vdisplay,
+		 interlaced ? "i" : "");
+}
+EXPORT_SYMBOL(drm_mode_set_name);
+
+/**
+ * drm_mode_vrefresh - get the vrefresh of a mode
+ * @mode: mode
+ *
+ * Returns:
+ * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
+ * value first if it is not yet set.
+ */
+int drm_mode_vrefresh(const struct drm_display_mode *mode)
+{
+	unsigned int num, den;
+
+	if (mode->htotal == 0 || mode->vtotal == 0)
+		return 0;
+
+	num = mode->clock;
+	den = mode->htotal * mode->vtotal;
+
+	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+		num *= 2;
+	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
+		den *= 2;
+	if (mode->vscan > 1)
+		den *= mode->vscan;
+
+	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
+}
+EXPORT_SYMBOL(drm_mode_vrefresh);
+
+/**
+ * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
+ * @mode: mode to query
+ * @hdisplay: hdisplay value to fill in
+ * @vdisplay: vdisplay value to fill in
+ *
+ * The vdisplay value will be doubled if the specified mode is a stereo mode of
+ * the appropriate layout.
+ */
+void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
+			    int *hdisplay, int *vdisplay)
+{
+	struct drm_display_mode adjusted;
+
+	drm_mode_init(&adjusted, mode);
+
+	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
+	*hdisplay = adjusted.crtc_hdisplay;
+	*vdisplay = adjusted.crtc_vdisplay;
+}
+EXPORT_SYMBOL(drm_mode_get_hv_timing);
+
+/**
+ * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
+ * @p: mode
+ * @adjust_flags: a combination of adjustment flags
+ *
+ * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
+ *
+ * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
+ *   interlaced modes.
+ * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
+ *   buffers containing two eyes (only adjust the timings when needed, eg. for
+ *   "frame packing" or "side by side full").
+ * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
+ *   be performed for doublescan and vscan > 1 modes respectively.
+ */
+void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
+{
+	if (!p)
+		return;
+
+	p->crtc_clock = p->clock;
+	p->crtc_hdisplay = p->hdisplay;
+	p->crtc_hsync_start = p->hsync_start;
+	p->crtc_hsync_end = p->hsync_end;
+	p->crtc_htotal = p->htotal;
+	p->crtc_hskew = p->hskew;
+	p->crtc_vdisplay = p->vdisplay;
+	p->crtc_vsync_start = p->vsync_start;
+	p->crtc_vsync_end = p->vsync_end;
+	p->crtc_vtotal = p->vtotal;
+
+	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
+		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
+			p->crtc_vdisplay /= 2;
+			p->crtc_vsync_start /= 2;
+			p->crtc_vsync_end /= 2;
+			p->crtc_vtotal /= 2;
+		}
+	}
+
+	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
+		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
+			p->crtc_vdisplay *= 2;
+			p->crtc_vsync_start *= 2;
+			p->crtc_vsync_end *= 2;
+			p->crtc_vtotal *= 2;
+		}
+	}
+
+	if (!(adjust_flags & CRTC_NO_VSCAN)) {
+		if (p->vscan > 1) {
+			p->crtc_vdisplay *= p->vscan;
+			p->crtc_vsync_start *= p->vscan;
+			p->crtc_vsync_end *= p->vscan;
+			p->crtc_vtotal *= p->vscan;
+		}
+	}
+
+	if (adjust_flags & CRTC_STEREO_DOUBLE) {
+		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
+
+		switch (layout) {
+		case DRM_MODE_FLAG_3D_FRAME_PACKING:
+			p->crtc_clock *= 2;
+			p->crtc_vdisplay += p->crtc_vtotal;
+			p->crtc_vsync_start += p->crtc_vtotal;
+			p->crtc_vsync_end += p->crtc_vtotal;
+			p->crtc_vtotal += p->crtc_vtotal;
+			break;
+		}
+	}
+
+	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
+	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
+	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
+	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
+}
+EXPORT_SYMBOL(drm_mode_set_crtcinfo);
+
+/**
+ * drm_mode_copy - copy the mode
+ * @dst: mode to overwrite
+ * @src: mode to copy
+ *
+ * Copy an existing mode into another mode, preserving the
+ * list head of the destination mode.
+ */
+void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
+{
+	struct list_head head = dst->head;
+
+	*dst = *src;
+	dst->head = head;
+}
+EXPORT_SYMBOL(drm_mode_copy);
+
+/**
+ * drm_mode_init - initialize the mode from another mode
+ * @dst: mode to overwrite
+ * @src: mode to copy
+ *
+ * Copy an existing mode into another mode, zeroing the
+ * list head of the destination mode. Typically used
+ * to guarantee the list head is not left with stack
+ * garbage in on-stack modes.
+ */
+void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
+{
+	memset(dst, 0, sizeof(*dst));
+	drm_mode_copy(dst, src);
+}
+EXPORT_SYMBOL(drm_mode_init);
+
+/**
+ * drm_mode_duplicate - allocate and duplicate an existing mode
+ * @dev: drm_device to allocate the duplicated mode for
+ * @mode: mode to duplicate
+ *
+ * Just allocate a new mode, copy the existing mode into it, and return
+ * a pointer to it.  Used to create new instances of established modes.
+ *
+ * Returns:
+ * Pointer to duplicated mode on success, NULL on error.
+ */
+struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
+					    const struct drm_display_mode *mode)
+{
+	struct drm_display_mode *nmode;
+
+	nmode = drm_mode_create(dev);
+	if (!nmode)
+		return NULL;
+
+	drm_mode_copy(nmode, mode);
+
+	return nmode;
+}
+EXPORT_SYMBOL(drm_mode_duplicate);
+
+static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
+				   const struct drm_display_mode *mode2)
+{
+	return mode1->hdisplay == mode2->hdisplay &&
+		mode1->hsync_start == mode2->hsync_start &&
+		mode1->hsync_end == mode2->hsync_end &&
+		mode1->htotal == mode2->htotal &&
+		mode1->hskew == mode2->hskew &&
+		mode1->vdisplay == mode2->vdisplay &&
+		mode1->vsync_start == mode2->vsync_start &&
+		mode1->vsync_end == mode2->vsync_end &&
+		mode1->vtotal == mode2->vtotal &&
+		mode1->vscan == mode2->vscan;
+}
+
+static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
+				  const struct drm_display_mode *mode2)
+{
+	/*
+	 * do clock check convert to PICOS
+	 * so fb modes get matched the same
+	 */
+	if (mode1->clock && mode2->clock)
+		return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
+	else
+		return mode1->clock == mode2->clock;
+}
+
+static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
+				 const struct drm_display_mode *mode2)
+{
+	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
+		(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
+}
+
+static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
+				    const struct drm_display_mode *mode2)
+{
+	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
+		(mode2->flags & DRM_MODE_FLAG_3D_MASK);
+}
+
+static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
+					const struct drm_display_mode *mode2)
+{
+	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
+}
+
+/**
+ * drm_mode_match - test modes for (partial) equality
+ * @mode1: first mode
+ * @mode2: second mode
+ * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
+ *
+ * Check to see if @mode1 and @mode2 are equivalent.
+ *
+ * Returns:
+ * True if the modes are (partially) equal, false otherwise.
+ */
+bool drm_mode_match(const struct drm_display_mode *mode1,
+		    const struct drm_display_mode *mode2,
+		    unsigned int match_flags)
+{
+	if (!mode1 && !mode2)
+		return true;
+
+	if (!mode1 || !mode2)
+		return false;
+
+	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
+	    !drm_mode_match_timings(mode1, mode2))
+		return false;
+
+	if (match_flags & DRM_MODE_MATCH_CLOCK &&
+	    !drm_mode_match_clock(mode1, mode2))
+		return false;
+
+	if (match_flags & DRM_MODE_MATCH_FLAGS &&
+	    !drm_mode_match_flags(mode1, mode2))
+		return false;
+
+	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
+	    !drm_mode_match_3d_flags(mode1, mode2))
+		return false;
+
+	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
+	    !drm_mode_match_aspect_ratio(mode1, mode2))
+		return false;
+
+	return true;
+}
+EXPORT_SYMBOL(drm_mode_match);
+
+/**
+ * drm_mode_equal - test modes for equality
+ * @mode1: first mode
+ * @mode2: second mode
+ *
+ * Check to see if @mode1 and @mode2 are equivalent.
+ *
+ * Returns:
+ * True if the modes are equal, false otherwise.
+ */
+bool drm_mode_equal(const struct drm_display_mode *mode1,
+		    const struct drm_display_mode *mode2)
+{
+	return drm_mode_match(mode1, mode2,
+			      DRM_MODE_MATCH_TIMINGS |
+			      DRM_MODE_MATCH_CLOCK |
+			      DRM_MODE_MATCH_FLAGS |
+			      DRM_MODE_MATCH_3D_FLAGS|
+			      DRM_MODE_MATCH_ASPECT_RATIO);
+}
+EXPORT_SYMBOL(drm_mode_equal);
+
+/**
+ * drm_mode_equal_no_clocks - test modes for equality
+ * @mode1: first mode
+ * @mode2: second mode
+ *
+ * Check to see if @mode1 and @mode2 are equivalent, but
+ * don't check the pixel clocks.
+ *
+ * Returns:
+ * True if the modes are equal, false otherwise.
+ */
+bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
+			      const struct drm_display_mode *mode2)
+{
+	return drm_mode_match(mode1, mode2,
+			      DRM_MODE_MATCH_TIMINGS |
+			      DRM_MODE_MATCH_FLAGS |
+			      DRM_MODE_MATCH_3D_FLAGS);
+}
+EXPORT_SYMBOL(drm_mode_equal_no_clocks);
+
+/**
+ * drm_mode_equal_no_clocks_no_stereo - test modes for equality
+ * @mode1: first mode
+ * @mode2: second mode
+ *
+ * Check to see if @mode1 and @mode2 are equivalent, but
+ * don't check the pixel clocks nor the stereo layout.
+ *
+ * Returns:
+ * True if the modes are equal, false otherwise.
+ */
+bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
+					const struct drm_display_mode *mode2)
+{
+	return drm_mode_match(mode1, mode2,
+			      DRM_MODE_MATCH_TIMINGS |
+			      DRM_MODE_MATCH_FLAGS);
+}
+EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
+
+static enum drm_mode_status
+drm_mode_validate_basic(const struct drm_display_mode *mode)
+{
+	if (mode->type & ~DRM_MODE_TYPE_ALL)
+		return MODE_BAD;
+
+	if (mode->flags & ~DRM_MODE_FLAG_ALL)
+		return MODE_BAD;
+
+	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
+		return MODE_BAD;
+
+	if (mode->clock == 0)
+		return MODE_CLOCK_LOW;
+
+	if (mode->hdisplay == 0 ||
+	    mode->hsync_start < mode->hdisplay ||
+	    mode->hsync_end < mode->hsync_start ||
+	    mode->htotal < mode->hsync_end)
+		return MODE_H_ILLEGAL;
+
+	if (mode->vdisplay == 0 ||
+	    mode->vsync_start < mode->vdisplay ||
+	    mode->vsync_end < mode->vsync_start ||
+	    mode->vtotal < mode->vsync_end)
+		return MODE_V_ILLEGAL;
+
+	return MODE_OK;
+}
+
+/**
+ * drm_mode_validate_driver - make sure the mode is somewhat sane
+ * @dev: drm device
+ * @mode: mode to check
+ *
+ * First do basic validation on the mode, and then allow the driver
+ * to check for device/driver specific limitations via the optional
+ * &drm_mode_config_helper_funcs.mode_valid hook.
+ *
+ * Returns:
+ * The mode status
+ */
+enum drm_mode_status
+drm_mode_validate_driver(struct drm_device *dev,
+			const struct drm_display_mode *mode)
+{
+	enum drm_mode_status status;
+
+	status = drm_mode_validate_basic(mode);
+	if (status != MODE_OK)
+		return status;
+
+	if (dev->mode_config.funcs->mode_valid)
+		return dev->mode_config.funcs->mode_valid(dev, mode);
+	else
+		return MODE_OK;
+}
+EXPORT_SYMBOL(drm_mode_validate_driver);
+
+/**
+ * drm_mode_validate_size - make sure modes adhere to size constraints
+ * @mode: mode to check
+ * @maxX: maximum width
+ * @maxY: maximum height
+ *
+ * This function is a helper which can be used to validate modes against size
+ * limitations of the DRM device/connector. If a mode is too big its status
+ * member is updated with the appropriate validation failure code. The list
+ * itself is not changed.
+ *
+ * Returns:
+ * The mode status
+ */
+enum drm_mode_status
+drm_mode_validate_size(const struct drm_display_mode *mode,
+		       int maxX, int maxY)
+{
+	if (maxX > 0 && mode->hdisplay > maxX)
+		return MODE_VIRTUAL_X;
+
+	if (maxY > 0 && mode->vdisplay > maxY)
+		return MODE_VIRTUAL_Y;
+
+	return MODE_OK;
+}
+EXPORT_SYMBOL(drm_mode_validate_size);
+
+/**
+ * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
+ * @mode: mode to check
+ * @connector: drm connector under action
+ *
+ * This function is a helper which can be used to filter out any YCBCR420
+ * only mode, when the source doesn't support it.
+ *
+ * Returns:
+ * The mode status
+ */
+enum drm_mode_status
+drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
+			   struct drm_connector *connector)
+{
+	if (!connector->ycbcr_420_allowed &&
+	    drm_mode_is_420_only(&connector->display_info, mode))
+		return MODE_NO_420;
+
+	return MODE_OK;
+}
+EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
+
+#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
+
+static const char * const drm_mode_status_names[] = {
+	MODE_STATUS(OK),
+	MODE_STATUS(HSYNC),
+	MODE_STATUS(VSYNC),
+	MODE_STATUS(H_ILLEGAL),
+	MODE_STATUS(V_ILLEGAL),
+	MODE_STATUS(BAD_WIDTH),
+	MODE_STATUS(NOMODE),
+	MODE_STATUS(NO_INTERLACE),
+	MODE_STATUS(NO_DBLESCAN),
+	MODE_STATUS(NO_VSCAN),
+	MODE_STATUS(MEM),
+	MODE_STATUS(VIRTUAL_X),
+	MODE_STATUS(VIRTUAL_Y),
+	MODE_STATUS(MEM_VIRT),
+	MODE_STATUS(NOCLOCK),
+	MODE_STATUS(CLOCK_HIGH),
+	MODE_STATUS(CLOCK_LOW),
+	MODE_STATUS(CLOCK_RANGE),
+	MODE_STATUS(BAD_HVALUE),
+	MODE_STATUS(BAD_VVALUE),
+	MODE_STATUS(BAD_VSCAN),
+	MODE_STATUS(HSYNC_NARROW),
+	MODE_STATUS(HSYNC_WIDE),
+	MODE_STATUS(HBLANK_NARROW),
+	MODE_STATUS(HBLANK_WIDE),
+	MODE_STATUS(VSYNC_NARROW),
+	MODE_STATUS(VSYNC_WIDE),
+	MODE_STATUS(VBLANK_NARROW),
+	MODE_STATUS(VBLANK_WIDE),
+	MODE_STATUS(PANEL),
+	MODE_STATUS(INTERLACE_WIDTH),
+	MODE_STATUS(ONE_WIDTH),
+	MODE_STATUS(ONE_HEIGHT),
+	MODE_STATUS(ONE_SIZE),
+	MODE_STATUS(NO_REDUCED),
+	MODE_STATUS(NO_STEREO),
+	MODE_STATUS(NO_420),
+	MODE_STATUS(STALE),
+	MODE_STATUS(BAD),
+	MODE_STATUS(ERROR),
+};
+
+#undef MODE_STATUS
+
+const char *drm_get_mode_status_name(enum drm_mode_status status)
+{
+	int index = status + 3;
+
+	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
+		return "";
+
+	return drm_mode_status_names[index];
+}
+
+/**
+ * drm_mode_prune_invalid - remove invalid modes from mode list
+ * @dev: DRM device
+ * @mode_list: list of modes to check
+ * @verbose: be verbose about it
+ *
+ * This helper function can be used to prune a display mode list after
+ * validation has been completed. All modes whose status is not MODE_OK will be
+ * removed from the list, and if @verbose the status code and mode name is also
+ * printed to dmesg.
+ */
+void drm_mode_prune_invalid(struct drm_device *dev,
+			    struct list_head *mode_list, bool verbose)
+{
+	struct drm_display_mode *mode, *t;
+
+	list_for_each_entry_safe(mode, t, mode_list, head) {
+		if (mode->status != MODE_OK) {
+			list_del(&mode->head);
+			if (mode->type & DRM_MODE_TYPE_USERDEF) {
+				drm_warn(dev, "User-defined mode not supported: "
+					 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
+			}
+			if (verbose) {
+				drm_mode_debug_printmodeline(mode);
+				DRM_DEBUG_KMS("Not using %s mode: %s\n",
+					      mode->name,
+					      drm_get_mode_status_name(mode->status));
+			}
+			drm_mode_destroy(dev, mode);
+		}
+	}
+}
+EXPORT_SYMBOL(drm_mode_prune_invalid);
+
+/**
+ * drm_mode_compare - compare modes for favorability
+ * @priv: unused
+ * @lh_a: list_head for first mode
+ * @lh_b: list_head for second mode
+ *
+ * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
+ * which is better.
+ *
+ * Returns:
+ * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
+ * positive if @lh_b is better than @lh_a.
+ */
+static int drm_mode_compare(void *priv, const struct list_head *lh_a,
+			    const struct list_head *lh_b)
+{
+	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
+	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
+	int diff;
+
+	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
+		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
+	if (diff)
+		return diff;
+	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
+	if (diff)
+		return diff;
+
+	diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
+	if (diff)
+		return diff;
+
+	diff = b->clock - a->clock;
+	return diff;
+}
+
+/**
+ * drm_mode_sort - sort mode list
+ * @mode_list: list of drm_display_mode structures to sort
+ *
+ * Sort @mode_list by favorability, moving good modes to the head of the list.
+ */
+void drm_mode_sort(struct list_head *mode_list)
+{
+	list_sort(NULL, mode_list, drm_mode_compare);
+}
+EXPORT_SYMBOL(drm_mode_sort);
+
+/**
+ * drm_connector_list_update - update the mode list for the connector
+ * @connector: the connector to update
+ *
+ * This moves the modes from the @connector probed_modes list
+ * to the actual mode list. It compares the probed mode against the current
+ * list and only adds different/new modes.
+ *
+ * This is just a helper functions doesn't validate any modes itself and also
+ * doesn't prune any invalid modes. Callers need to do that themselves.
+ */
+void drm_connector_list_update(struct drm_connector *connector)
+{
+	struct drm_display_mode *pmode, *pt;
+
+	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
+
+	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
+		struct drm_display_mode *mode;
+		bool found_it = false;
+
+		/* go through current modes checking for the new probed mode */
+		list_for_each_entry(mode, &connector->modes, head) {
+			if (!drm_mode_equal(pmode, mode))
+				continue;
+
+			found_it = true;
+
+			/*
+			 * If the old matching mode is stale (ie. left over
+			 * from a previous probe) just replace it outright.
+			 * Otherwise just merge the type bits between all
+			 * equal probed modes.
+			 *
+			 * If two probed modes are considered equal, pick the
+			 * actual timings from the one that's marked as
+			 * preferred (in case the match isn't 100%). If
+			 * multiple or zero preferred modes are present, favor
+			 * the mode added to the probed_modes list first.
+			 */
+			if (mode->status == MODE_STALE) {
+				drm_mode_copy(mode, pmode);
+			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
+				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
+				pmode->type |= mode->type;
+				drm_mode_copy(mode, pmode);
+			} else {
+				mode->type |= pmode->type;
+			}
+
+			list_del(&pmode->head);
+			drm_mode_destroy(connector->dev, pmode);
+			break;
+		}
+
+		if (!found_it) {
+			list_move_tail(&pmode->head, &connector->modes);
+		}
+	}
+}
+EXPORT_SYMBOL(drm_connector_list_update);
+
+static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
+				      struct drm_cmdline_mode *mode)
+{
+	unsigned int bpp;
+
+	if (str[0] != '-')
+		return -EINVAL;
+
+	str++;
+	bpp = simple_strtol(str, end_ptr, 10);
+	if (*end_ptr == str)
+		return -EINVAL;
+
+	mode->bpp = bpp;
+	mode->bpp_specified = true;
+
+	return 0;
+}
+
+static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
+					  struct drm_cmdline_mode *mode)
+{
+	unsigned int refresh;
+
+	if (str[0] != '@')
+		return -EINVAL;
+
+	str++;
+	refresh = simple_strtol(str, end_ptr, 10);
+	if (*end_ptr == str)
+		return -EINVAL;
+
+	mode->refresh = refresh;
+	mode->refresh_specified = true;
+
+	return 0;
+}
+
+static int drm_mode_parse_cmdline_extra(const char *str, int length,
+					bool freestanding,
+					const struct drm_connector *connector,
+					struct drm_cmdline_mode *mode)
+{
+	int i;
+
+	for (i = 0; i < length; i++) {
+		switch (str[i]) {
+		case 'i':
+			if (freestanding)
+				return -EINVAL;
+
+			mode->interlace = true;
+			break;
+		case 'm':
+			if (freestanding)
+				return -EINVAL;
+
+			mode->margins = true;
+			break;
+		case 'D':
+			if (mode->force != DRM_FORCE_UNSPECIFIED)
+				return -EINVAL;
+
+			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
+			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
+				mode->force = DRM_FORCE_ON;
+			else
+				mode->force = DRM_FORCE_ON_DIGITAL;
+			break;
+		case 'd':
+			if (mode->force != DRM_FORCE_UNSPECIFIED)
+				return -EINVAL;
+
+			mode->force = DRM_FORCE_OFF;
+			break;
+		case 'e':
+			if (mode->force != DRM_FORCE_UNSPECIFIED)
+				return -EINVAL;
+
+			mode->force = DRM_FORCE_ON;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
+					   bool extras,
+					   const struct drm_connector *connector,
+					   struct drm_cmdline_mode *mode)
+{
+	const char *str_start = str;
+	bool rb = false, cvt = false;
+	int xres = 0, yres = 0;
+	int remaining, i;
+	char *end_ptr;
+
+	xres = simple_strtol(str, &end_ptr, 10);
+	if (end_ptr == str)
+		return -EINVAL;
+
+	if (end_ptr[0] != 'x')
+		return -EINVAL;
+	end_ptr++;
+
+	str = end_ptr;
+	yres = simple_strtol(str, &end_ptr, 10);
+	if (end_ptr == str)
+		return -EINVAL;
+
+	remaining = length - (end_ptr - str_start);
+	if (remaining < 0)
+		return -EINVAL;
+
+	for (i = 0; i < remaining; i++) {
+		switch (end_ptr[i]) {
+		case 'M':
+			cvt = true;
+			break;
+		case 'R':
+			rb = true;
+			break;
+		default:
+			/*
+			 * Try to pass that to our extras parsing
+			 * function to handle the case where the
+			 * extras are directly after the resolution
+			 */
+			if (extras) {
+				int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
+								       1,
+								       false,
+								       connector,
+								       mode);
+				if (ret)
+					return ret;
+			} else {
+				return -EINVAL;
+			}
+		}
+	}
+
+	mode->xres = xres;
+	mode->yres = yres;
+	mode->cvt = cvt;
+	mode->rb = rb;
+
+	return 0;
+}
+
+static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
+{
+	const char *value;
+	char *endp;
+
+	/*
+	 * delim must point to the '=', otherwise it is a syntax error and
+	 * if delim points to the terminating zero, then delim + 1 will point
+	 * past the end of the string.
+	 */
+	if (*delim != '=')
+		return -EINVAL;
+
+	value = delim + 1;
+	*int_ret = simple_strtol(value, &endp, 10);
+
+	/* Make sure we have parsed something */
+	if (endp == value)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int drm_mode_parse_panel_orientation(const char *delim,
+					    struct drm_cmdline_mode *mode)
+{
+	const char *value;
+
+	if (*delim != '=')
+		return -EINVAL;
+
+	value = delim + 1;
+	delim = strchr(value, ',');
+	if (!delim)
+		delim = value + strlen(value);
+
+	if (!strncmp(value, "normal", delim - value))
+		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
+	else if (!strncmp(value, "upside_down", delim - value))
+		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
+	else if (!strncmp(value, "left_side_up", delim - value))
+		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
+	else if (!strncmp(value, "right_side_up", delim - value))
+		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static int drm_mode_parse_tv_mode(const char *delim,
+				  struct drm_cmdline_mode *mode)
+{
+	const char *value;
+	int ret;
+
+	if (*delim != '=')
+		return -EINVAL;
+
+	value = delim + 1;
+	delim = strchr(value, ',');
+	if (!delim)
+		delim = value + strlen(value);
+
+	ret = drm_get_tv_mode_from_name(value, delim - value);
+	if (ret < 0)
+		return ret;
+
+	mode->tv_mode_specified = true;
+	mode->tv_mode = ret;
+
+	return 0;
+}
+
+static int drm_mode_parse_cmdline_options(const char *str,
+					  bool freestanding,
+					  const struct drm_connector *connector,
+					  struct drm_cmdline_mode *mode)
+{
+	unsigned int deg, margin, rotation = 0;
+	const char *delim, *option, *sep;
+
+	option = str;
+	do {
+		delim = strchr(option, '=');
+		if (!delim) {
+			delim = strchr(option, ',');
+
+			if (!delim)
+				delim = option + strlen(option);
+		}
+
+		if (!strncmp(option, "rotate", delim - option)) {
+			if (drm_mode_parse_cmdline_int(delim, &deg))
+				return -EINVAL;
+
+			switch (deg) {
+			case 0:
+				rotation |= DRM_MODE_ROTATE_0;
+				break;
+
+			case 90:
+				rotation |= DRM_MODE_ROTATE_90;
+				break;
+
+			case 180:
+				rotation |= DRM_MODE_ROTATE_180;
+				break;
+
+			case 270:
+				rotation |= DRM_MODE_ROTATE_270;
+				break;
+
+			default:
+				return -EINVAL;
+			}
+		} else if (!strncmp(option, "reflect_x", delim - option)) {
+			rotation |= DRM_MODE_REFLECT_X;
+		} else if (!strncmp(option, "reflect_y", delim - option)) {
+			rotation |= DRM_MODE_REFLECT_Y;
+		} else if (!strncmp(option, "margin_right", delim - option)) {
+			if (drm_mode_parse_cmdline_int(delim, &margin))
+				return -EINVAL;
+
+			mode->tv_margins.right = margin;
+		} else if (!strncmp(option, "margin_left", delim - option)) {
+			if (drm_mode_parse_cmdline_int(delim, &margin))
+				return -EINVAL;
+
+			mode->tv_margins.left = margin;
+		} else if (!strncmp(option, "margin_top", delim - option)) {
+			if (drm_mode_parse_cmdline_int(delim, &margin))
+				return -EINVAL;
+
+			mode->tv_margins.top = margin;
+		} else if (!strncmp(option, "margin_bottom", delim - option)) {
+			if (drm_mode_parse_cmdline_int(delim, &margin))
+				return -EINVAL;
+
+			mode->tv_margins.bottom = margin;
+		} else if (!strncmp(option, "panel_orientation", delim - option)) {
+			if (drm_mode_parse_panel_orientation(delim, mode))
+				return -EINVAL;
+		} else if (!strncmp(option, "tv_mode", delim - option)) {
+			if (drm_mode_parse_tv_mode(delim, mode))
+				return -EINVAL;
+		} else {
+			return -EINVAL;
+		}
+		sep = strchr(delim, ',');
+		option = sep + 1;
+	} while (sep);
+
+	if (rotation && freestanding)
+		return -EINVAL;
+
+	if (!(rotation & DRM_MODE_ROTATE_MASK))
+		rotation |= DRM_MODE_ROTATE_0;
+
+	/* Make sure there is exactly one rotation defined */
+	if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
+		return -EINVAL;
+
+	mode->rotation_reflection = rotation;
+
+	return 0;
+}
+
+struct drm_named_mode {
+	const char *name;
+	unsigned int pixel_clock_khz;
+	unsigned int xres;
+	unsigned int yres;
+	unsigned int flags;
+	unsigned int tv_mode;
+};
+
+#define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode)	\
+	{						\
+		.name = _name,				\
+		.pixel_clock_khz = _pclk,		\
+		.xres = _x,				\
+		.yres = _y,				\
+		.flags = _flags,			\
+		.tv_mode = _mode,			\
+	}
+
+static const struct drm_named_mode drm_named_modes[] = {
+	NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
+	NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
+	NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
+	NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
+};
+
+static int drm_mode_parse_cmdline_named_mode(const char *name,
+					     unsigned int name_end,
+					     struct drm_cmdline_mode *cmdline_mode)
+{
+	unsigned int i;
+
+	if (!name_end)
+		return 0;
+
+	/* If the name starts with a digit, it's not a named mode */
+	if (isdigit(name[0]))
+		return 0;
+
+	/*
+	 * If there's an equal sign in the name, the command-line
+	 * contains only an option and no mode.
+	 */
+	if (strnchr(name, name_end, '='))
+		return 0;
+
+	/* The connection status extras can be set without a mode. */
+	if (name_end == 1 &&
+	    (name[0] == 'd' || name[0] == 'D' || name[0] == 'e'))
+		return 0;
+
+	/*
+	 * We're sure we're a named mode at this point, iterate over the
+	 * list of modes we're aware of.
+	 */
+	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
+		const struct drm_named_mode *mode = &drm_named_modes[i];
+		int ret;
+
+		ret = str_has_prefix(name, mode->name);
+		if (ret != name_end)
+			continue;
+
+		strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
+		cmdline_mode->pixel_clock = mode->pixel_clock_khz;
+		cmdline_mode->xres = mode->xres;
+		cmdline_mode->yres = mode->yres;
+		cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
+		cmdline_mode->tv_mode = mode->tv_mode;
+		cmdline_mode->tv_mode_specified = true;
+		cmdline_mode->specified = true;
+
+		return 1;
+	}
+
+	return -EINVAL;
+}
+
+/**
+ * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
+ * @mode_option: optional per connector mode option
+ * @connector: connector to parse modeline for
+ * @mode: preallocated drm_cmdline_mode structure to fill out
+ *
+ * This parses @mode_option command line modeline for modes and options to
+ * configure the connector.
+ *
+ * This uses the same parameters as the fb modedb.c, except for an extra
+ * force-enable, force-enable-digital and force-disable bit at the end::
+ *
+ *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
+ *
+ * Additionals options can be provided following the mode, using a comma to
+ * separate each option. Valid options can be found in
+ * Documentation/fb/modedb.rst.
+ *
+ * The intermediate drm_cmdline_mode structure is required to store additional
+ * options from the command line modline like the force-enable/disable flag.
+ *
+ * Returns:
+ * True if a valid modeline has been parsed, false otherwise.
+ */
+bool drm_mode_parse_command_line_for_connector(const char *mode_option,
+					       const struct drm_connector *connector,
+					       struct drm_cmdline_mode *mode)
+{
+	const char *name;
+	bool freestanding = false, parse_extras = false;
+	unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
+	unsigned int mode_end = 0;
+	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
+	const char *options_ptr = NULL;
+	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
+	int len, ret;
+
+	memset(mode, 0, sizeof(*mode));
+	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+
+	if (!mode_option)
+		return false;
+
+	name = mode_option;
+
+	/* Locate the start of named options */
+	options_ptr = strchr(name, ',');
+	if (options_ptr)
+		options_off = options_ptr - name;
+	else
+		options_off = strlen(name);
+
+	/* Try to locate the bpp and refresh specifiers, if any */
+	bpp_ptr = strnchr(name, options_off, '-');
+	while (bpp_ptr && !isdigit(bpp_ptr[1]))
+		bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
+	if (bpp_ptr)
+		bpp_off = bpp_ptr - name;
+
+	refresh_ptr = strnchr(name, options_off, '@');
+	if (refresh_ptr)
+		refresh_off = refresh_ptr - name;
+
+	/* Locate the end of the name / resolution, and parse it */
+	if (bpp_ptr) {
+		mode_end = bpp_off;
+	} else if (refresh_ptr) {
+		mode_end = refresh_off;
+	} else if (options_ptr) {
+		mode_end = options_off;
+		parse_extras = true;
+	} else {
+		mode_end = strlen(name);
+		parse_extras = true;
+	}
+
+	if (!mode_end)
+		return false;
+
+	ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode);
+	if (ret < 0)
+		return false;
+
+	/*
+	 * Having a mode that starts by a letter (and thus is named) and
+	 * an at-sign (used to specify a refresh rate) is disallowed.
+	 */
+	if (ret && refresh_ptr)
+		return false;
+
+	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
+	if (!mode->specified && isdigit(name[0])) {
+		ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
+						      parse_extras,
+						      connector,
+						      mode);
+		if (ret)
+			return false;
+
+		mode->specified = true;
+	}
+
+	/* No mode? Check for freestanding extras and/or options */
+	if (!mode->specified) {
+		unsigned int len = strlen(mode_option);
+
+		if (bpp_ptr || refresh_ptr)
+			return false; /* syntax error */
+
+		if (len == 1 || (len >= 2 && mode_option[1] == ','))
+			extra_ptr = mode_option;
+		else
+			options_ptr = mode_option - 1;
+
+		freestanding = true;
+	}
+
+	if (bpp_ptr) {
+		ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
+		if (ret)
+			return false;
+
+		mode->bpp_specified = true;
+	}
+
+	if (refresh_ptr) {
+		ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
+						     &refresh_end_ptr, mode);
+		if (ret)
+			return false;
+
+		mode->refresh_specified = true;
+	}
+
+	/*
+	 * Locate the end of the bpp / refresh, and parse the extras
+	 * if relevant
+	 */
+	if (bpp_ptr && refresh_ptr)
+		extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
+	else if (bpp_ptr)
+		extra_ptr = bpp_end_ptr;
+	else if (refresh_ptr)
+		extra_ptr = refresh_end_ptr;
+
+	if (extra_ptr) {
+		if (options_ptr)
+			len = options_ptr - extra_ptr;
+		else
+			len = strlen(extra_ptr);
+
+		ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
+						   connector, mode);
+		if (ret)
+			return false;
+	}
+
+	if (options_ptr) {
+		ret = drm_mode_parse_cmdline_options(options_ptr + 1,
+						     freestanding,
+						     connector, mode);
+		if (ret)
+			return false;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
+
+static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
+					       struct drm_cmdline_mode *cmd)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
+		const struct drm_named_mode *named_mode = &drm_named_modes[i];
+
+		if (strcmp(cmd->name, named_mode->name))
+			continue;
+
+		if (!cmd->tv_mode_specified)
+			continue;
+
+		return drm_analog_tv_mode(dev,
+					  named_mode->tv_mode,
+					  named_mode->pixel_clock_khz * 1000,
+					  named_mode->xres,
+					  named_mode->yres,
+					  named_mode->flags & DRM_MODE_FLAG_INTERLACE);
+	}
+
+	return NULL;
+}
+
+/**
+ * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
+ * @dev: DRM device to create the new mode for
+ * @cmd: input command line modeline
+ *
+ * Returns:
+ * Pointer to converted mode on success, NULL on error.
+ */
+struct drm_display_mode *
+drm_mode_create_from_cmdline_mode(struct drm_device *dev,
+				  struct drm_cmdline_mode *cmd)
+{
+	struct drm_display_mode *mode;
+
+	if (cmd->xres == 0 || cmd->yres == 0)
+		return NULL;
+
+	if (strlen(cmd->name))
+		mode = drm_named_mode(dev, cmd);
+	else if (cmd->cvt)
+		mode = drm_cvt_mode(dev,
+				    cmd->xres, cmd->yres,
+				    cmd->refresh_specified ? cmd->refresh : 60,
+				    cmd->rb, cmd->interlace,
+				    cmd->margins);
+	else
+		mode = drm_gtf_mode(dev,
+				    cmd->xres, cmd->yres,
+				    cmd->refresh_specified ? cmd->refresh : 60,
+				    cmd->interlace,
+				    cmd->margins);
+	if (!mode)
+		return NULL;
+
+	mode->type |= DRM_MODE_TYPE_USERDEF;
+	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
+	if (cmd->xres == 1366)
+		drm_mode_fixup_1366x768(mode);
+	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
+	return mode;
+}
+EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
+
+/**
+ * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
+ * @out: drm_mode_modeinfo struct to return to the user
+ * @in: drm_display_mode to use
+ *
+ * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
+ * the user.
+ */
+void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
+			       const struct drm_display_mode *in)
+{
+	out->clock = in->clock;
+	out->hdisplay = in->hdisplay;
+	out->hsync_start = in->hsync_start;
+	out->hsync_end = in->hsync_end;
+	out->htotal = in->htotal;
+	out->hskew = in->hskew;
+	out->vdisplay = in->vdisplay;
+	out->vsync_start = in->vsync_start;
+	out->vsync_end = in->vsync_end;
+	out->vtotal = in->vtotal;
+	out->vscan = in->vscan;
+	out->vrefresh = drm_mode_vrefresh(in);
+	out->flags = in->flags;
+	out->type = in->type;
+
+	switch (in->picture_aspect_ratio) {
+	case HDMI_PICTURE_ASPECT_4_3:
+		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
+		break;
+	case HDMI_PICTURE_ASPECT_16_9:
+		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
+		break;
+	case HDMI_PICTURE_ASPECT_64_27:
+		out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
+		break;
+	case HDMI_PICTURE_ASPECT_256_135:
+		out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
+		break;
+	default:
+		WARN(1, "Invalid aspect ratio (0%x) on mode\n",
+		     in->picture_aspect_ratio);
+		fallthrough;
+	case HDMI_PICTURE_ASPECT_NONE:
+		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
+		break;
+	}
+
+	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
+	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
+}
+
+/**
+ * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
+ * @dev: drm device
+ * @out: drm_display_mode to return to the user
+ * @in: drm_mode_modeinfo to use
+ *
+ * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
+ * the caller.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_convert_umode(struct drm_device *dev,
+			   struct drm_display_mode *out,
+			   const struct drm_mode_modeinfo *in)
+{
+	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
+		return -ERANGE;
+
+	out->clock = in->clock;
+	out->hdisplay = in->hdisplay;
+	out->hsync_start = in->hsync_start;
+	out->hsync_end = in->hsync_end;
+	out->htotal = in->htotal;
+	out->hskew = in->hskew;
+	out->vdisplay = in->vdisplay;
+	out->vsync_start = in->vsync_start;
+	out->vsync_end = in->vsync_end;
+	out->vtotal = in->vtotal;
+	out->vscan = in->vscan;
+	out->flags = in->flags;
+	/*
+	 * Old xf86-video-vmware (possibly others too) used to
+	 * leave 'type' uninitialized. Just ignore any bits we
+	 * don't like. It's a just hint after all, and more
+	 * useful for the kernel->userspace direction anyway.
+	 */
+	out->type = in->type & DRM_MODE_TYPE_ALL;
+	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
+	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
+
+	/* Clearing picture aspect ratio bits from out flags,
+	 * as the aspect-ratio information is not stored in
+	 * flags for kernel-mode, but in picture_aspect_ratio.
+	 */
+	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
+
+	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
+	case DRM_MODE_FLAG_PIC_AR_4_3:
+		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
+		break;
+	case DRM_MODE_FLAG_PIC_AR_16_9:
+		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
+		break;
+	case DRM_MODE_FLAG_PIC_AR_64_27:
+		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
+		break;
+	case DRM_MODE_FLAG_PIC_AR_256_135:
+		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
+		break;
+	case DRM_MODE_FLAG_PIC_AR_NONE:
+		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	out->status = drm_mode_validate_driver(dev, out);
+	if (out->status != MODE_OK)
+		return -EINVAL;
+
+	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
+
+	return 0;
+}
+
+/**
+ * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
+ * output format
+ *
+ * @display: display under action
+ * @mode: video mode to be tested.
+ *
+ * Returns:
+ * true if the mode can be supported in YCBCR420 format
+ * false if not.
+ */
+bool drm_mode_is_420_only(const struct drm_display_info *display,
+			  const struct drm_display_mode *mode)
+{
+	u8 vic = drm_match_cea_mode(mode);
+
+	return test_bit(vic, display->hdmi.y420_vdb_modes);
+}
+EXPORT_SYMBOL(drm_mode_is_420_only);
+
+/**
+ * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
+ * output format also (along with RGB/YCBCR444/422)
+ *
+ * @display: display under action.
+ * @mode: video mode to be tested.
+ *
+ * Returns:
+ * true if the mode can be support YCBCR420 format
+ * false if not.
+ */
+bool drm_mode_is_420_also(const struct drm_display_info *display,
+			  const struct drm_display_mode *mode)
+{
+	u8 vic = drm_match_cea_mode(mode);
+
+	return test_bit(vic, display->hdmi.y420_cmdb_modes);
+}
+EXPORT_SYMBOL(drm_mode_is_420_also);
+/**
+ * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
+ * output format
+ *
+ * @display: display under action.
+ * @mode: video mode to be tested.
+ *
+ * Returns:
+ * true if the mode can be supported in YCBCR420 format
+ * false if not.
+ */
+bool drm_mode_is_420(const struct drm_display_info *display,
+		     const struct drm_display_mode *mode)
+{
+	return drm_mode_is_420_only(display, mode) ||
+		drm_mode_is_420_also(display, mode);
+}
+EXPORT_SYMBOL(drm_mode_is_420);