Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 402 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..f18581297
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -0,0 +1,402 @@
+/*
+ * Copyright (C) 2016 Broadcom Limited
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * 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_crtc_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <linux/clk.h>
+#include <linux/component.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 platform_device *pdev;
+
+	struct drm_encoder *encoder;
+
+	void __iomem *regs;
+
+	struct clk *pixel_clock;
+	struct clk *core_clock;
+};
+
+#define DPI_READ(offset) readl(dpi->regs + (offset))
+#define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset))
+
+/* VC4 DPI encoder KMS struct */
+struct vc4_dpi_encoder {
+	struct vc4_encoder base;
+	struct vc4_dpi *dpi;
+};
+
+static inline struct vc4_dpi_encoder *
+to_vc4_dpi_encoder(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct vc4_dpi_encoder, base.base);
+}
+
+#define DPI_REG(reg) { reg, #reg }
+static const struct {
+	u32 reg;
+	const char *name;
+} dpi_regs[] = {
+	DPI_REG(DPI_C),
+	DPI_REG(DPI_ID),
+};
+
+#ifdef CONFIG_DEBUG_FS
+int vc4_dpi_debugfs_regs(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *)m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_dpi *dpi = vc4->dpi;
+	int i;
+
+	if (!dpi)
+		return 0;
+
+	for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
+		seq_printf(m, "%s (0x%04x): 0x%08x\n",
+			   dpi_regs[i].name, dpi_regs[i].reg,
+			   DPI_READ(dpi_regs[i].reg));
+	}
+
+	return 0;
+}
+#endif
+
+static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
+{
+	struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
+	struct vc4_dpi *dpi = vc4_encoder->dpi;
+
+	clk_disable_unprepare(dpi->pixel_clock);
+}
+
+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_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
+	struct vc4_dpi *dpi = vc4_encoder->dpi;
+	struct drm_connector_list_iter conn_iter;
+	struct drm_connector *connector = NULL, *connector_scan;
+	u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE;
+	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);
+
+	if (connector && connector->display_info.num_bus_formats) {
+		u32 bus_format = connector->display_info.bus_formats[0];
+
+		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_3,
+					       DPI_FORMAT);
+			break;
+		default:
+			DRM_ERROR("Unknown media bus format %d\n", bus_format);
+			break;
+		}
+	} else {
+		/* Default to 24bit if no connector found. */
+		dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, DPI_FORMAT);
+	}
+
+	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;
+
+	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);
+}
+
+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 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 device *dev = &dpi->pdev->dev;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
+	int ret;
+
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
+					  &panel, &bridge);
+	if (ret) {
+		/* If nothing was connected in the DT, that's not an
+		 * error.
+		 */
+		if (ret == -ENODEV)
+			return 0;
+		else
+			return ret;
+	}
+
+	if (panel)
+		bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DPI);
+
+	return drm_bridge_attach(dpi->encoder, bridge, NULL);
+}
+
+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_dev *vc4 = to_vc4_dev(drm);
+	struct vc4_dpi *dpi;
+	struct vc4_dpi_encoder *vc4_dpi_encoder;
+	int ret;
+
+	dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
+	if (!dpi)
+		return -ENOMEM;
+
+	vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder),
+				       GFP_KERNEL);
+	if (!vc4_dpi_encoder)
+		return -ENOMEM;
+	vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI;
+	vc4_dpi_encoder->dpi = dpi;
+	dpi->encoder = &vc4_dpi_encoder->base.base;
+
+	dpi->pdev = pdev;
+	dpi->regs = vc4_ioremap_regs(pdev, 0);
+	if (IS_ERR(dpi->regs))
+		return PTR_ERR(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);
+
+	drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs,
+			 DRM_MODE_ENCODER_DPI, NULL);
+	drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs);
+
+	ret = vc4_dpi_init_bridge(dpi);
+	if (ret)
+		goto err_destroy_encoder;
+
+	dev_set_drvdata(dev, dpi);
+
+	vc4->dpi = dpi;
+
+	return 0;
+
+err_destroy_encoder:
+	drm_encoder_cleanup(dpi->encoder);
+	clk_disable_unprepare(dpi->core_clock);
+	return ret;
+}
+
+static void vc4_dpi_unbind(struct device *dev, struct device *master,
+			   void *data)
+{
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = to_vc4_dev(drm);
+	struct vc4_dpi *dpi = dev_get_drvdata(dev);
+
+	drm_of_panel_bridge_remove(dev->of_node, 0, 0);
+
+	drm_encoder_cleanup(dpi->encoder);
+
+	clk_disable_unprepare(dpi->core_clock);
+
+	vc4->dpi = NULL;
+}
+
+static const struct component_ops vc4_dpi_ops = {
+	.bind   = vc4_dpi_bind,
+	.unbind = vc4_dpi_unbind,
+};
+
+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,
+	},
+};