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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/gpu/drm/sun4i/sun4i_rgb.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/sun4i/sun4i_rgb.c')
-rw-r--r--drivers/gpu/drm/sun4i/sun4i_rgb.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
new file mode 100644
index 000000000..dfb6acc42
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015 Free Electrons
+ * Copyright (C) 2015 NextThing Co
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ */
+
+#include <linux/clk.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#include "sun4i_crtc.h"
+#include "sun4i_tcon.h"
+#include "sun4i_rgb.h"
+
+struct sun4i_rgb {
+ struct drm_connector connector;
+ struct drm_encoder encoder;
+
+ struct sun4i_tcon *tcon;
+ struct drm_panel *panel;
+ struct drm_bridge *bridge;
+};
+
+static inline struct sun4i_rgb *
+drm_connector_to_sun4i_rgb(struct drm_connector *connector)
+{
+ return container_of(connector, struct sun4i_rgb,
+ connector);
+}
+
+static inline struct sun4i_rgb *
+drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
+{
+ return container_of(encoder, struct sun4i_rgb,
+ encoder);
+}
+
+static int sun4i_rgb_get_modes(struct drm_connector *connector)
+{
+ struct sun4i_rgb *rgb =
+ drm_connector_to_sun4i_rgb(connector);
+
+ return drm_panel_get_modes(rgb->panel, connector);
+}
+
+/*
+ * VESA DMT defines a tolerance of 0.5% on the pixel clock, while the
+ * CVT spec reuses that tolerance in its examples, so it looks to be a
+ * good default tolerance for the EDID-based modes. Define it to 5 per
+ * mille to avoid floating point operations.
+ */
+#define SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE 5
+
+static enum drm_mode_status sun4i_rgb_mode_valid(struct drm_encoder *crtc,
+ const struct drm_display_mode *mode)
+{
+ struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(crtc);
+ struct sun4i_tcon *tcon = rgb->tcon;
+ u32 hsync = mode->hsync_end - mode->hsync_start;
+ u32 vsync = mode->vsync_end - mode->vsync_start;
+ unsigned long long rate = mode->clock * 1000;
+ unsigned long long lowest, highest;
+ unsigned long long rounded_rate;
+
+ DRM_DEBUG_DRIVER("Validating modes...\n");
+
+ if (hsync < 1)
+ return MODE_HSYNC_NARROW;
+
+ if (hsync > 0x3ff)
+ return MODE_HSYNC_WIDE;
+
+ if ((mode->hdisplay < 1) || (mode->htotal < 1))
+ return MODE_H_ILLEGAL;
+
+ if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
+ return MODE_BAD_HVALUE;
+
+ DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
+
+ if (vsync < 1)
+ return MODE_VSYNC_NARROW;
+
+ if (vsync > 0x3ff)
+ return MODE_VSYNC_WIDE;
+
+ if ((mode->vdisplay < 1) || (mode->vtotal < 1))
+ return MODE_V_ILLEGAL;
+
+ if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
+ return MODE_BAD_VVALUE;
+
+ DRM_DEBUG_DRIVER("Vertical parameters OK\n");
+
+ /*
+ * TODO: We should use the struct display_timing if available
+ * and / or trying to stretch the timings within that
+ * tolerancy to take care of panels that we wouldn't be able
+ * to have a exact match for.
+ */
+ if (rgb->panel) {
+ DRM_DEBUG_DRIVER("RGB panel used, skipping clock rate checks");
+ goto out;
+ }
+
+ /*
+ * That shouldn't ever happen unless something is really wrong, but it
+ * doesn't harm to check.
+ */
+ if (!rgb->bridge)
+ goto out;
+
+ tcon->dclk_min_div = 6;
+ tcon->dclk_max_div = 127;
+ rounded_rate = clk_round_rate(tcon->dclk, rate);
+
+ lowest = rate * (1000 - SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);
+ do_div(lowest, 1000);
+ if (rounded_rate < lowest)
+ return MODE_CLOCK_LOW;
+
+ highest = rate * (1000 + SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);
+ do_div(highest, 1000);
+ if (rounded_rate > highest)
+ return MODE_CLOCK_HIGH;
+
+out:
+ DRM_DEBUG_DRIVER("Clock rate OK\n");
+
+ return MODE_OK;
+}
+
+static const struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
+ .get_modes = sun4i_rgb_get_modes,
+};
+
+static void
+sun4i_rgb_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs sun4i_rgb_con_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = sun4i_rgb_connector_destroy,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
+{
+ struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
+
+ DRM_DEBUG_DRIVER("Enabling RGB output\n");
+
+ if (rgb->panel) {
+ drm_panel_prepare(rgb->panel);
+ drm_panel_enable(rgb->panel);
+ }
+}
+
+static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
+{
+ struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
+
+ DRM_DEBUG_DRIVER("Disabling RGB output\n");
+
+ if (rgb->panel) {
+ drm_panel_disable(rgb->panel);
+ drm_panel_unprepare(rgb->panel);
+ }
+}
+
+static const struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
+ .disable = sun4i_rgb_encoder_disable,
+ .enable = sun4i_rgb_encoder_enable,
+ .mode_valid = sun4i_rgb_mode_valid,
+};
+
+int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)
+{
+ struct drm_encoder *encoder;
+ struct sun4i_rgb *rgb;
+ int ret;
+
+ rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
+ if (!rgb)
+ return -ENOMEM;
+ rgb->tcon = tcon;
+ encoder = &rgb->encoder;
+
+ ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
+ &rgb->panel, &rgb->bridge);
+ if (ret) {
+ dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
+ return 0;
+ }
+
+ drm_encoder_helper_add(&rgb->encoder,
+ &sun4i_rgb_enc_helper_funcs);
+ ret = drm_simple_encoder_init(drm, &rgb->encoder,
+ DRM_MODE_ENCODER_NONE);
+ if (ret) {
+ dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
+ goto err_out;
+ }
+
+ /* The RGB encoder can only work with the TCON channel 0 */
+ rgb->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc);
+
+ if (rgb->panel) {
+ drm_connector_helper_add(&rgb->connector,
+ &sun4i_rgb_con_helper_funcs);
+ ret = drm_connector_init(drm, &rgb->connector,
+ &sun4i_rgb_con_funcs,
+ DRM_MODE_CONNECTOR_Unknown);
+ if (ret) {
+ dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
+ goto err_cleanup_connector;
+ }
+
+ drm_connector_attach_encoder(&rgb->connector,
+ &rgb->encoder);
+ }
+
+ if (rgb->bridge) {
+ ret = drm_bridge_attach(encoder, rgb->bridge, NULL, 0);
+ if (ret)
+ goto err_cleanup_connector;
+ }
+
+ return 0;
+
+err_cleanup_connector:
+ drm_encoder_cleanup(&rgb->encoder);
+err_out:
+ return ret;
+}
+EXPORT_SYMBOL(sun4i_rgb_init);