Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 391 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
new file mode 100644
index 000000000..61ef7d232
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -0,0 +1,391 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2016 Broadcom Limited
+ */
+
+/**
+ * DOC: VC4 DPI module
+ *
+ * The VC4 DPI hardware supports MIPI DPI type 4 and Nokia ViSSI
+ * signals.  On BCM2835, these can be routed out to GPIO0-27 with the
+ * ALT2 function.
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/media-bus-format.h>
+#include <linux/of_graph.h>
+#include <linux/of_platform.h>
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+#define DPI_C			0x00
+# define DPI_OUTPUT_ENABLE_MODE		BIT(16)
+
+/* The order field takes the incoming 24 bit RGB from the pixel valve
+ * and shuffles the 3 channels.
+ */
+# define DPI_ORDER_MASK			VC4_MASK(15, 14)
+# define DPI_ORDER_SHIFT		14
+# define DPI_ORDER_RGB			0
+# define DPI_ORDER_BGR			1
+# define DPI_ORDER_GRB			2
+# define DPI_ORDER_BRG			3
+
+/* The format field takes the ORDER-shuffled pixel valve data and
+ * formats it onto the output lines.
+ */
+# define DPI_FORMAT_MASK		VC4_MASK(13, 11)
+# define DPI_FORMAT_SHIFT		11
+/* This define is named in the hardware, but actually just outputs 0. */
+# define DPI_FORMAT_9BIT_666_RGB	0
+/* Outputs 00000000rrrrrggggggbbbbb */
+# define DPI_FORMAT_16BIT_565_RGB_1	1
+/* Outputs 000rrrrr00gggggg000bbbbb */
+# define DPI_FORMAT_16BIT_565_RGB_2	2
+/* Outputs 00rrrrr000gggggg00bbbbb0 */
+# define DPI_FORMAT_16BIT_565_RGB_3	3
+/* Outputs 000000rrrrrrggggggbbbbbb */
+# define DPI_FORMAT_18BIT_666_RGB_1	4
+/* Outputs 00rrrrrr00gggggg00bbbbbb */
+# define DPI_FORMAT_18BIT_666_RGB_2	5
+/* Outputs rrrrrrrrggggggggbbbbbbbb */
+# define DPI_FORMAT_24BIT_888_RGB	6
+
+/* Reverses the polarity of the corresponding signal */
+# define DPI_PIXEL_CLK_INVERT		BIT(10)
+# define DPI_HSYNC_INVERT		BIT(9)
+# define DPI_VSYNC_INVERT		BIT(8)
+# define DPI_OUTPUT_ENABLE_INVERT	BIT(7)
+
+/* Outputs the signal the falling clock edge instead of rising. */
+# define DPI_HSYNC_NEGATE		BIT(6)
+# define DPI_VSYNC_NEGATE		BIT(5)
+# define DPI_OUTPUT_ENABLE_NEGATE	BIT(4)
+
+/* Disables the signal */
+# define DPI_HSYNC_DISABLE		BIT(3)
+# define DPI_VSYNC_DISABLE		BIT(2)
+# define DPI_OUTPUT_ENABLE_DISABLE	BIT(1)
+
+/* Power gate to the device, full reset at 0 -> 1 transition */
+# define DPI_ENABLE			BIT(0)
+
+/* All other registers besides DPI_C return the ID */
+#define DPI_ID			0x04
+# define DPI_ID_VALUE		0x00647069
+
+/* General DPI hardware state. */
+struct vc4_dpi {
+	struct vc4_encoder encoder;
+
+	struct platform_device *pdev;
+
+	void __iomem *regs;
+
+	struct clk *pixel_clock;
+	struct clk *core_clock;
+
+	struct debugfs_regset32 regset;
+};
+
+static inline struct vc4_dpi *
+to_vc4_dpi(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct vc4_dpi, encoder.base);
+}
+
+#define DPI_READ(offset) readl(dpi->regs + (offset))
+#define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset))
+
+static const struct debugfs_reg32 dpi_regs[] = {
+	VC4_REG32(DPI_C),
+	VC4_REG32(DPI_ID),
+};
+
+static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
+{
+	struct drm_device *dev = encoder->dev;
+	struct vc4_dpi *dpi = to_vc4_dpi(encoder);
+	int idx;
+
+	if (!drm_dev_enter(dev, &idx))
+		return;
+
+	clk_disable_unprepare(dpi->pixel_clock);
+
+	drm_dev_exit(idx);
+}
+
+static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
+{
+	struct drm_device *dev = encoder->dev;
+	struct drm_display_mode *mode = &encoder->crtc->mode;
+	struct vc4_dpi *dpi = to_vc4_dpi(encoder);
+	struct drm_connector_list_iter conn_iter;
+	struct drm_connector *connector = NULL, *connector_scan;
+	u32 dpi_c = DPI_ENABLE;
+	int idx;
+	int ret;
+
+	/* Look up the connector attached to DPI so we can get the
+	 * bus_format.  Ideally the bridge would tell us the
+	 * bus_format we want, but it doesn't yet, so assume that it's
+	 * uniform throughout the bridge chain.
+	 */
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector_scan, &conn_iter) {
+		if (connector_scan->encoder == encoder) {
+			connector = connector_scan;
+			break;
+		}
+	}
+	drm_connector_list_iter_end(&conn_iter);
+
+	/* Default to 24bit if no connector or format found. */
+	dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, DPI_FORMAT);
+
+	if (connector) {
+		if (connector->display_info.num_bus_formats) {
+			u32 bus_format = connector->display_info.bus_formats[0];
+
+			dpi_c &= ~DPI_FORMAT_MASK;
+
+			switch (bus_format) {
+			case MEDIA_BUS_FMT_RGB888_1X24:
+				dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
+						       DPI_FORMAT);
+				break;
+			case MEDIA_BUS_FMT_BGR888_1X24:
+				dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
+						       DPI_FORMAT);
+				dpi_c |= VC4_SET_FIELD(DPI_ORDER_BGR,
+						       DPI_ORDER);
+				break;
+			case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+				dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_2,
+						       DPI_FORMAT);
+				break;
+			case MEDIA_BUS_FMT_RGB666_1X18:
+				dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1,
+						       DPI_FORMAT);
+				break;
+			case MEDIA_BUS_FMT_RGB565_1X16:
+				dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_1,
+						       DPI_FORMAT);
+				break;
+			default:
+				DRM_ERROR("Unknown media bus format %d\n",
+					  bus_format);
+				break;
+			}
+		}
+
+		if (connector->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
+			dpi_c |= DPI_PIXEL_CLK_INVERT;
+
+		if (connector->display_info.bus_flags & DRM_BUS_FLAG_DE_LOW)
+			dpi_c |= DPI_OUTPUT_ENABLE_INVERT;
+	}
+
+	if (mode->flags & DRM_MODE_FLAG_CSYNC) {
+		if (mode->flags & DRM_MODE_FLAG_NCSYNC)
+			dpi_c |= DPI_OUTPUT_ENABLE_INVERT;
+	} else {
+		dpi_c |= DPI_OUTPUT_ENABLE_MODE;
+
+		if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+			dpi_c |= DPI_HSYNC_INVERT;
+		else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
+			dpi_c |= DPI_HSYNC_DISABLE;
+
+		if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+			dpi_c |= DPI_VSYNC_INVERT;
+		else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
+			dpi_c |= DPI_VSYNC_DISABLE;
+	}
+
+	if (!drm_dev_enter(dev, &idx))
+		return;
+
+	DPI_WRITE(DPI_C, dpi_c);
+
+	ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000);
+	if (ret)
+		DRM_ERROR("Failed to set clock rate: %d\n", ret);
+
+	ret = clk_prepare_enable(dpi->pixel_clock);
+	if (ret)
+		DRM_ERROR("Failed to set clock rate: %d\n", ret);
+
+	drm_dev_exit(idx);
+}
+
+static enum drm_mode_status vc4_dpi_encoder_mode_valid(struct drm_encoder *encoder,
+						       const struct drm_display_mode *mode)
+{
+	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+		return MODE_NO_INTERLACE;
+
+	return MODE_OK;
+}
+
+static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = {
+	.disable = vc4_dpi_encoder_disable,
+	.enable = vc4_dpi_encoder_enable,
+	.mode_valid = vc4_dpi_encoder_mode_valid,
+};
+
+static int vc4_dpi_late_register(struct drm_encoder *encoder)
+{
+	struct drm_device *drm = encoder->dev;
+	struct vc4_dpi *dpi = to_vc4_dpi(encoder);
+	int ret;
+
+	ret = vc4_debugfs_add_regset32(drm->primary, "dpi_regs", &dpi->regset);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = {
+	.late_register = vc4_dpi_late_register,
+};
+
+static const struct of_device_id vc4_dpi_dt_match[] = {
+	{ .compatible = "brcm,bcm2835-dpi", .data = NULL },
+	{}
+};
+
+/* Sets up the next link in the display chain, whether it's a panel or
+ * a bridge.
+ */
+static int vc4_dpi_init_bridge(struct vc4_dpi *dpi)
+{
+	struct drm_device *drm = dpi->encoder.base.dev;
+	struct device *dev = &dpi->pdev->dev;
+	struct drm_bridge *bridge;
+
+	bridge = drmm_of_get_bridge(drm, dev->of_node, 0, 0);
+	if (IS_ERR(bridge)) {
+		/* If nothing was connected in the DT, that's not an
+		 * error.
+		 */
+		if (PTR_ERR(bridge) == -ENODEV)
+			return 0;
+		else
+			return PTR_ERR(bridge);
+	}
+
+	return drm_bridge_attach(&dpi->encoder.base, bridge, NULL, 0);
+}
+
+static void vc4_dpi_disable_clock(void *ptr)
+{
+	struct vc4_dpi *dpi = ptr;
+
+	clk_disable_unprepare(dpi->core_clock);
+}
+
+static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dpi *dpi;
+	int ret;
+
+	dpi = drmm_kzalloc(drm, sizeof(*dpi), GFP_KERNEL);
+	if (!dpi)
+		return -ENOMEM;
+
+	dpi->encoder.type = VC4_ENCODER_TYPE_DPI;
+	dpi->pdev = pdev;
+	dpi->regs = vc4_ioremap_regs(pdev, 0);
+	if (IS_ERR(dpi->regs))
+		return PTR_ERR(dpi->regs);
+	dpi->regset.base = dpi->regs;
+	dpi->regset.regs = dpi_regs;
+	dpi->regset.nregs = ARRAY_SIZE(dpi_regs);
+
+	if (DPI_READ(DPI_ID) != DPI_ID_VALUE) {
+		dev_err(dev, "Port returned 0x%08x for ID instead of 0x%08x\n",
+			DPI_READ(DPI_ID), DPI_ID_VALUE);
+		return -ENODEV;
+	}
+
+	dpi->core_clock = devm_clk_get(dev, "core");
+	if (IS_ERR(dpi->core_clock)) {
+		ret = PTR_ERR(dpi->core_clock);
+		if (ret != -EPROBE_DEFER)
+			DRM_ERROR("Failed to get core clock: %d\n", ret);
+		return ret;
+	}
+
+	dpi->pixel_clock = devm_clk_get(dev, "pixel");
+	if (IS_ERR(dpi->pixel_clock)) {
+		ret = PTR_ERR(dpi->pixel_clock);
+		if (ret != -EPROBE_DEFER)
+			DRM_ERROR("Failed to get pixel clock: %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(dpi->core_clock);
+	if (ret) {
+		DRM_ERROR("Failed to turn on core clock: %d\n", ret);
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(dev, vc4_dpi_disable_clock, dpi);
+	if (ret)
+		return ret;
+
+	ret = drmm_encoder_init(drm, &dpi->encoder.base,
+				&vc4_dpi_encoder_funcs,
+				DRM_MODE_ENCODER_DPI,
+				NULL);
+	if (ret)
+		return ret;
+
+	drm_encoder_helper_add(&dpi->encoder.base, &vc4_dpi_encoder_helper_funcs);
+
+	ret = vc4_dpi_init_bridge(dpi);
+	if (ret)
+		return ret;
+
+	dev_set_drvdata(dev, dpi);
+
+	return 0;
+}
+
+static const struct component_ops vc4_dpi_ops = {
+	.bind   = vc4_dpi_bind,
+};
+
+static int vc4_dpi_dev_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &vc4_dpi_ops);
+}
+
+static int vc4_dpi_dev_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &vc4_dpi_ops);
+	return 0;
+}
+
+struct platform_driver vc4_dpi_driver = {
+	.probe = vc4_dpi_dev_probe,
+	.remove = vc4_dpi_dev_remove,
+	.driver = {
+		.name = "vc4_dpi",
+		.of_match_table = vc4_dpi_dt_match,
+	},
+};