Merge tag 'tilcdc-4.10' of https://github.com/jsarha/linux into drm-next

tilcdc changes for v4.10

* tag 'tilcdc-4.10' of https://github.com/jsarha/linux: (23 commits)
  drm/tilcdc: fix parsing of some DT properties
  drm/tilcdc: Enable frame done irq and functionality for LCDC rev 1
  drm/tilcdc: Configure video mode to HW in enable() not in mode_set_nofb()
  drm/tilcdc: Load palette at the end of mode_set_nofb()
  drm/tilcdc: Add timeout wait for palette loading to complete
  drm/tilcdc: Enable palette loading for revision 2 LCDC too
  drm/tilcdc: Fix load mode bit-field setting in tilcdc_crtc_enable()
  drm/tilcdc: Add tilcdc_write_mask() to tilcdc_regs.h
  drm/tilcdc: Fix tilcdc_crtc_create() return value handling
  drm/tilcdc: implement palette loading for rev1
  drm/tilcdc: Enable sync lost error and recovery handling for rev 1 LCDC
  drm/tilcdc: Add drm bridge support for attaching drm bridge drivers
  drm/bridge: Add ti-tfp410 DVI transmitter driver
  dt-bindings: Move "ti,tfp410.txt" from display/ti to display/bridge
  drm/tilcdc: Recover from sync lost error flood by resetting the LCDC
  drm/tilcdc: Fix race from forced shutdown of crtc in unload
  drm/tilcdc: Use unload to handle initialization failures
  drm/tilcdc: Stop using struct drm_driver load() callback
  drm/tilcdc: Remove obsolete drm_connector_register() calls
  drm/tilcdc: Correct misspelling in error message
  ...

Documentation/devicetree/bindings/display/ti/ti,tfp410.txt → Documentation/devicetree/bindings/display/bridge/ti,tfp410.txt

@@ -6,10 +6,15 @@ Required properties:
 
 Optional properties:
 - powerdown-gpios: power-down gpio
+- reg: I2C address. If and only if present the device node
+       should be placed into the i2c controller node where the
+       tfp410 i2c is connected to.
 
 Required nodes:
-- Video port 0 for DPI input
-- Video port 1 for DVI output
+- Video port 0 for DPI input [1].
+- Video port 1 for DVI output [1].
+
+[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
 
 Example
 -------

Documentation/devicetree/bindings/display/tilcdc/tilcdc.txt

@@ -1,7 +1,9 @@
 Device-Tree bindings for tilcdc DRM driver
 
 Required properties:
- - compatible: value should be "ti,am33xx-tilcdc".
+ - compatible: value should be one of the following:
+    - "ti,am33xx-tilcdc" for AM335x based boards
+    - "ti,da850-tilcdc" for DA850/AM18x/OMAP-L138 based boards
  - interrupts: the interrupt number
  - reg: base address and size of the LCDC device
 
@@ -51,7 +53,7 @@ Optional nodes:
 Example:
 
 	fb: fb@4830e000 {
-		compatible = "ti,am33xx-tilcdc";
+		compatible = "ti,am33xx-tilcdc", "ti,da850-tilcdc";
 		reg = <0x4830e000 0x1000>;
 		interrupt-parent = <&intc>;
 		interrupts = <36>;

drivers/gpu/drm/bridge/Kconfig

@@ -90,6 +90,13 @@ config DRM_TOSHIBA_TC358767
 	---help---
 	  Toshiba TC358767 eDP bridge chip driver.
 
+config DRM_TI_TFP410
+	tristate "TI TFP410 DVI/HDMI bridge"
+	depends on OF
+	select DRM_KMS_HELPER
+	---help---
+	  Texas Instruments TFP410 DVI/HDMI Transmitter driver
+
 source "drivers/gpu/drm/bridge/analogix/Kconfig"
 
 source "drivers/gpu/drm/bridge/adv7511/Kconfig"

drivers/gpu/drm/bridge/Makefile

@@ -12,3 +12,4 @@ obj-$(CONFIG_DRM_SII902X) += sii902x.o
 obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
 obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
 obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
+obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o

drivers/gpu/drm/bridge/ti-tfp410.c

@@ -0,0 +1,317 @@
+/*
+ * Copyright (C) 2016 Texas Instruments
+ * Author: Jyri Sarha <jsarha@ti.com>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+
+struct tfp410 {
+	struct drm_bridge	bridge;
+	struct drm_connector	connector;
+
+	struct i2c_adapter	*ddc;
+
+	struct device *dev;
+};
+
+static inline struct tfp410 *
+drm_bridge_to_tfp410(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct tfp410, bridge);
+}
+
+static inline struct tfp410 *
+drm_connector_to_tfp410(struct drm_connector *connector)
+{
+	return container_of(connector, struct tfp410, connector);
+}
+
+static int tfp410_get_modes(struct drm_connector *connector)
+{
+	struct tfp410 *dvi = drm_connector_to_tfp410(connector);
+	struct edid *edid;
+	int ret;
+
+	if (!dvi->ddc)
+		goto fallback;
+
+	edid = drm_get_edid(connector, dvi->ddc);
+	if (!edid) {
+		DRM_INFO("EDID read failed. Fallback to standard modes\n");
+		goto fallback;
+	}
+
+	drm_mode_connector_update_edid_property(connector, edid);
+
+	return drm_add_edid_modes(connector, edid);
+fallback:
+	/* No EDID, fallback on the XGA standard modes */
+	ret = drm_add_modes_noedid(connector, 1920, 1200);
+
+	/* And prefer a mode pretty much anything can handle */
+	drm_set_preferred_mode(connector, 1024, 768);
+
+	return ret;
+}
+
+static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
+	.get_modes	= tfp410_get_modes,
+};
+
+static enum drm_connector_status
+tfp410_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct tfp410 *dvi = drm_connector_to_tfp410(connector);
+
+	if (dvi->ddc) {
+		if (drm_probe_ddc(dvi->ddc))
+			return connector_status_connected;
+		else
+			return connector_status_disconnected;
+	}
+
+	return connector_status_unknown;
+}
+
+static const struct drm_connector_funcs tfp410_con_funcs = {
+	.dpms			= drm_atomic_helper_connector_dpms,
+	.detect			= tfp410_connector_detect,
+	.fill_modes		= drm_helper_probe_single_connector_modes,
+	.destroy		= drm_connector_cleanup,
+	.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 int tfp410_attach(struct drm_bridge *bridge)
+{
+	struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
+	int ret;
+
+	if (!bridge->encoder) {
+		dev_err(dvi->dev, "Missing encoder\n");
+		return -ENODEV;
+	}
+
+	drm_connector_helper_add(&dvi->connector,
+				 &tfp410_con_helper_funcs);
+	ret = drm_connector_init(bridge->dev, &dvi->connector,
+				 &tfp410_con_funcs, DRM_MODE_CONNECTOR_HDMIA);
+	if (ret) {
+		dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret);
+		return ret;
+	}
+
+	drm_mode_connector_attach_encoder(&dvi->connector,
+					  bridge->encoder);
+
+	return 0;
+}
+
+static const struct drm_bridge_funcs tfp410_bridge_funcs = {
+	.attach		= tfp410_attach,
+};
+
+static int tfp410_get_connector_ddc(struct tfp410 *dvi)
+{
+	struct device_node *ep = NULL, *connector_node = NULL;
+	struct device_node *ddc_phandle = NULL;
+	int ret = 0;
+
+	/* port@1 is the connector node */
+	ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
+	if (!ep)
+		goto fail;
+
+	connector_node = of_graph_get_remote_port_parent(ep);
+	if (!connector_node)
+		goto fail;
+
+	ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
+	if (!ddc_phandle)
+		goto fail;
+
+	dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle);
+	if (dvi->ddc)
+		dev_info(dvi->dev, "Connector's ddc i2c bus found\n");
+	else
+		ret = -EPROBE_DEFER;
+
+fail:
+	of_node_put(ep);
+	of_node_put(connector_node);
+	of_node_put(ddc_phandle);
+	return ret;
+}
+
+static int tfp410_init(struct device *dev)
+{
+	struct tfp410 *dvi;
+	int ret;
+
+	if (!dev->of_node) {
+		dev_err(dev, "device-tree data is missing\n");
+		return -ENXIO;
+	}
+
+	dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);
+	if (!dvi)
+		return -ENOMEM;
+	dev_set_drvdata(dev, dvi);
+
+	dvi->bridge.funcs = &tfp410_bridge_funcs;
+	dvi->bridge.of_node = dev->of_node;
+	dvi->dev = dev;
+
+	ret = tfp410_get_connector_ddc(dvi);
+	if (ret)
+		goto fail;
+
+	ret = drm_bridge_add(&dvi->bridge);
+	if (ret) {
+		dev_err(dev, "drm_bridge_add() failed: %d\n", ret);
+		goto fail;
+	}
+
+	return 0;
+fail:
+	i2c_put_adapter(dvi->ddc);
+	return ret;
+}
+
+static int tfp410_fini(struct device *dev)
+{
+	struct tfp410 *dvi = dev_get_drvdata(dev);
+
+	drm_bridge_remove(&dvi->bridge);
+
+	if (dvi->ddc)
+		i2c_put_adapter(dvi->ddc);
+
+	return 0;
+}
+
+static int tfp410_probe(struct platform_device *pdev)
+{
+	return tfp410_init(&pdev->dev);
+}
+
+static int tfp410_remove(struct platform_device *pdev)
+{
+	return tfp410_fini(&pdev->dev);
+}
+
+static const struct of_device_id tfp410_match[] = {
+	{ .compatible = "ti,tfp410" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, tfp410_match);
+
+struct platform_driver tfp410_platform_driver = {
+	.probe	= tfp410_probe,
+	.remove	= tfp410_remove,
+	.driver	= {
+		.name		= "tfp410-bridge",
+		.of_match_table	= tfp410_match,
+	},
+};
+
+#if IS_ENABLED(CONFIG_I2C)
+/* There is currently no i2c functionality. */
+static int tfp410_i2c_probe(struct i2c_client *client,
+			    const struct i2c_device_id *id)
+{
+	int reg;
+
+	if (!client->dev.of_node ||
+	    of_property_read_u32(client->dev.of_node, "reg", &reg)) {
+		dev_err(&client->dev,
+			"Can't get i2c reg property from device-tree\n");
+		return -ENXIO;
+	}
+
+	return tfp410_init(&client->dev);
+}
+
+static int tfp410_i2c_remove(struct i2c_client *client)
+{
+	return tfp410_fini(&client->dev);
+}
+
+static const struct i2c_device_id tfp410_i2c_ids[] = {
+	{ "tfp410", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);
+
+static struct i2c_driver tfp410_i2c_driver = {
+	.driver = {
+		.name	= "tfp410",
+		.of_match_table = of_match_ptr(tfp410_match),
+	},
+	.id_table	= tfp410_i2c_ids,
+	.probe		= tfp410_i2c_probe,
+	.remove		= tfp410_i2c_remove,
+};
+#endif /* IS_ENABLED(CONFIG_I2C) */
+
+static struct {
+	uint i2c:1;
+	uint platform:1;
+}  tfp410_registered_driver;
+
+static int __init tfp410_module_init(void)
+{
+	int ret;
+
+#if IS_ENABLED(CONFIG_I2C)
+	ret = i2c_add_driver(&tfp410_i2c_driver);
+	if (ret)
+		pr_err("%s: registering i2c driver failed: %d",
+		       __func__, ret);
+	else
+		tfp410_registered_driver.i2c = 1;
+#endif
+
+	ret = platform_driver_register(&tfp410_platform_driver);
+	if (ret)
+		pr_err("%s: registering platform driver failed: %d",
+		       __func__, ret);
+	else
+		tfp410_registered_driver.platform = 1;
+
+	if (tfp410_registered_driver.i2c ||
+	    tfp410_registered_driver.platform)
+		return 0;
+
+	return ret;
+}
+module_init(tfp410_module_init);
+
+static void __exit tfp410_module_exit(void)
+{
+#if IS_ENABLED(CONFIG_I2C)
+	if (tfp410_registered_driver.i2c)
+		i2c_del_driver(&tfp410_i2c_driver);
+#endif
+	if (tfp410_registered_driver.platform)
+		platform_driver_unregister(&tfp410_platform_driver);
+}
+module_exit(tfp410_module_exit);
+
+MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
+MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");
+MODULE_LICENSE("GPL");

drivers/gpu/drm/tilcdc/tilcdc_crtc.c

@@ -21,11 +21,15 @@
 #include <drm/drm_flip_work.h>
 #include <drm/drm_plane_helper.h>
 #include <linux/workqueue.h>
+#include <linux/completion.h>
+#include <linux/dma-mapping.h>
 
 #include "tilcdc_drv.h"
 #include "tilcdc_regs.h"
 
-#define TILCDC_VBLANK_SAFETY_THRESHOLD_US 1000
+#define TILCDC_VBLANK_SAFETY_THRESHOLD_US	1000
+#define TILCDC_PALETTE_SIZE			32
+#define TILCDC_PALETTE_FIRST_ENTRY		0x4000
 
 struct tilcdc_crtc {
 	struct drm_crtc base;
@@ -33,7 +37,9 @@ struct tilcdc_crtc {
 	struct drm_plane primary;
 	const struct tilcdc_panel_info *info;
 	struct drm_pending_vblank_event *event;
+	struct mutex enable_lock;
 	bool enabled;
+	bool shutdown;
 	wait_queue_head_t frame_done_wq;
 	bool frame_done;
 	spinlock_t irq_lock;
@@ -53,6 +59,11 @@ struct tilcdc_crtc {
 
 	int sync_lost_count;
 	bool frame_intact;
+	struct work_struct recover_work;
+
+	dma_addr_t palette_dma_handle;
+	u16 *palette_base;
+	struct completion palette_loaded;
 };
 #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base)
 
@@ -71,6 +82,7 @@ static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
 {
 	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 	struct drm_device *dev = crtc->dev;
+	struct tilcdc_drm_private *priv = dev->dev_private;
 	struct drm_gem_cma_object *gem;
 	dma_addr_t start, end;
 	u64 dma_base_and_ceiling;
@@ -88,7 +100,10 @@ static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
 	 * unlikely that LCDC would fetch the DMA addresses in the middle of
 	 * an update.
 	 */
-	dma_base_and_ceiling = (u64)(end - 1) << 32 | start;
+	if (priv->rev == 1)
+		end -= 1;
+
+	dma_base_and_ceiling = (u64)end << 32 | start;
 	tilcdc_write64(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, dma_base_and_ceiling);
 
 	if (tilcdc_crtc->curr_fb)
@@ -98,6 +113,56 @@ static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
 	tilcdc_crtc->curr_fb = fb;
 }
 
+/*
+ * The driver currently only supports only true color formats. For
+ * true color the palette block is bypassed, but a 32 byte palette
+ * should still be loaded. The first 16-bit entry must be 0x4000 while
+ * all other entries must be zeroed.
+ */
+static void tilcdc_crtc_load_palette(struct drm_crtc *crtc)
+{
+	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+	struct drm_device *dev = crtc->dev;
+	struct tilcdc_drm_private *priv = dev->dev_private;
+	int ret;
+
+	reinit_completion(&tilcdc_crtc->palette_loaded);
+
+	/* Tell the LCDC where the palette is located. */
+	tilcdc_write(dev, LCDC_DMA_FB_BASE_ADDR_0_REG,
+		     tilcdc_crtc->palette_dma_handle);
+	tilcdc_write(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG,
+		     (u32) tilcdc_crtc->palette_dma_handle +
+		     TILCDC_PALETTE_SIZE - 1);
+
+	/* Set dma load mode for palette loading only. */
+	tilcdc_write_mask(dev, LCDC_RASTER_CTRL_REG,
+			  LCDC_PALETTE_LOAD_MODE(PALETTE_ONLY),
+			  LCDC_PALETTE_LOAD_MODE_MASK);
+
+	/* Enable DMA Palette Loaded Interrupt */
+	if (priv->rev == 1)
+		tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA);
+	else
+		tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_PL_INT_ENA);
+
+	/* Enable LCDC DMA and wait for palette to be loaded. */
+	tilcdc_clear_irqstatus(dev, 0xffffffff);
+	tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
+
+	ret = wait_for_completion_timeout(&tilcdc_crtc->palette_loaded,
+					  msecs_to_jiffies(50));
+	if (ret == 0)
+		dev_err(dev->dev, "%s: Palette loading timeout", __func__);
+
+	/* Disable LCDC DMA and DMA Palette Loaded Interrupt. */
+	tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
+	if (priv->rev == 1)
+		tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA);
+	else
+		tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG, LCDC_V2_PL_INT_ENA);
+}
+
 static void tilcdc_crtc_enable_irqs(struct drm_device *dev)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
@@ -106,6 +171,7 @@ static void tilcdc_crtc_enable_irqs(struct drm_device *dev)
 
 	if (priv->rev == 1) {
 		tilcdc_set(dev, LCDC_RASTER_CTRL_REG,
+			LCDC_V1_SYNC_LOST_INT_ENA | LCDC_V1_FRAME_DONE_INT_ENA |
 			LCDC_V1_UNDERFLOW_INT_ENA);
 		tilcdc_set(dev, LCDC_DMA_CTRL_REG,
 			LCDC_V1_END_OF_FRAME_INT_ENA);
@@ -124,6 +190,7 @@ static void tilcdc_crtc_disable_irqs(struct drm_device *dev)
 	/* disable irqs that we might have enabled: */
 	if (priv->rev == 1) {
 		tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
+			LCDC_V1_SYNC_LOST_INT_ENA | LCDC_V1_FRAME_DONE_INT_ENA |
 			LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 		tilcdc_clear(dev, LCDC_DMA_CTRL_REG,
 			LCDC_V1_END_OF_FRAME_INT_ENA);
@@ -148,193 +215,68 @@ static void reset(struct drm_crtc *crtc)
 	tilcdc_clear(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
 }
 
-static void tilcdc_crtc_enable(struct drm_crtc *crtc)
+/*
+ * Calculate the percentage difference between the requested pixel clock rate
+ * and the effective rate resulting from calculating the clock divider value.
+ */
+static unsigned int tilcdc_pclk_diff(unsigned long rate,
+				     unsigned long real_rate)
 {
-	struct drm_device *dev = crtc->dev;
-	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
-
-	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
-
-	if (tilcdc_crtc->enabled)
-		return;
-
-	pm_runtime_get_sync(dev->dev);
-
-	reset(crtc);
-
-	tilcdc_crtc_enable_irqs(dev);
-
-	tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_DUAL_FRAME_BUFFER_ENABLE);
-	tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_PALETTE_LOAD_MODE(DATA_ONLY));
-	tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
-
-	drm_crtc_vblank_on(crtc);
+	int r = rate / 100, rr = real_rate / 100;
 
-	tilcdc_crtc->enabled = true;
+	return (unsigned int)(abs(((rr - r) * 100) / r));
 }
 
-void tilcdc_crtc_disable(struct drm_crtc *crtc)
+static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
 {
-	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 	struct drm_device *dev = crtc->dev;
 	struct tilcdc_drm_private *priv = dev->dev_private;
-
-	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
-
-	if (!tilcdc_crtc->enabled)
-		return;
-
-	tilcdc_crtc->frame_done = false;
-	tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
-
-	/*
-	 * if necessary wait for framedone irq which will still come
-	 * before putting things to sleep..
-	 */
-	if (priv->rev == 2) {
-		int ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
-					     tilcdc_crtc->frame_done,
-					     msecs_to_jiffies(500));
-		if (ret == 0)
-			dev_err(dev->dev, "%s: timeout waiting for framedone\n",
-				__func__);
-	}
-
-	drm_crtc_vblank_off(crtc);
-
-	tilcdc_crtc_disable_irqs(dev);
-
-	pm_runtime_put_sync(dev->dev);
-
-	if (tilcdc_crtc->next_fb) {
-		drm_flip_work_queue(&tilcdc_crtc->unref_work,
-				    tilcdc_crtc->next_fb);
-		tilcdc_crtc->next_fb = NULL;
-	}
-
-	if (tilcdc_crtc->curr_fb) {
-		drm_flip_work_queue(&tilcdc_crtc->unref_work,
-				    tilcdc_crtc->curr_fb);
-		tilcdc_crtc->curr_fb = NULL;
-	}
-
-	drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq);
-	tilcdc_crtc->last_vblank = ktime_set(0, 0);
-
-	tilcdc_crtc->enabled = false;
-}
-
-static bool tilcdc_crtc_is_on(struct drm_crtc *crtc)
-{
-	return crtc->state && crtc->state->enable && crtc->state->active;
-}
-
-static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
-{
-	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
-	struct tilcdc_drm_private *priv = crtc->dev->dev_private;
-
-	drm_modeset_lock_crtc(crtc, NULL);
-	tilcdc_crtc_disable(crtc);
-	drm_modeset_unlock_crtc(crtc);
-
-	flush_workqueue(priv->wq);
-
-	of_node_put(crtc->port);
-	drm_crtc_cleanup(crtc);
-	drm_flip_work_cleanup(&tilcdc_crtc->unref_work);
-}
-
-int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
-		struct drm_framebuffer *fb,
-		struct drm_pending_vblank_event *event)
-{
-	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
-	struct drm_device *dev = crtc->dev;
-	unsigned long flags;
-
-	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
-
-	if (tilcdc_crtc->event) {
-		dev_err(dev->dev, "already pending page flip!\n");
-		return -EBUSY;
-	}
-
-	drm_framebuffer_reference(fb);
-
-	crtc->primary->fb = fb;
-
-	spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
-
-	if (crtc->hwmode.vrefresh && ktime_to_ns(tilcdc_crtc->last_vblank)) {
-		ktime_t next_vblank;
-		s64 tdiff;
-
-		next_vblank = ktime_add_us(tilcdc_crtc->last_vblank,
-			1000000 / crtc->hwmode.vrefresh);
-
-		tdiff = ktime_to_us(ktime_sub(next_vblank, ktime_get()));
-
-		if (tdiff < TILCDC_VBLANK_SAFETY_THRESHOLD_US)
-			tilcdc_crtc->next_fb = fb;
-	}
-
-	if (tilcdc_crtc->next_fb != fb)
-		set_scanout(crtc, fb);
-
-	tilcdc_crtc->event = event;
-
-	spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
-
-	return 0;
-}
-
-static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
-		const struct drm_display_mode *mode,
-		struct drm_display_mode *adjusted_mode)
-{
 	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+	unsigned long clk_rate, real_rate, req_rate;
+	unsigned int clkdiv;
+	int ret;
 
-	if (!tilcdc_crtc->simulate_vesa_sync)
-		return true;
+	clkdiv = 2; /* first try using a standard divider of 2 */
 
-	/*
-	 * tilcdc does not generate VESA-compliant sync but aligns
-	 * VS on the second edge of HS instead of first edge.
-	 * We use adjusted_mode, to fixup sync by aligning both rising
-	 * edges and add HSKEW offset to fix the sync.
-	 */
-	adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
-	adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
+	/* mode.clock is in KHz, set_rate wants parameter in Hz */
+	req_rate = crtc->mode.clock * 1000;
 
-	if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
-		adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
-		adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
-	} else {
-		adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
-		adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
-	}
+	ret = clk_set_rate(priv->clk, req_rate * clkdiv);
+	clk_rate = clk_get_rate(priv->clk);
+	if (ret < 0) {
+		/*
+		 * If we fail to set the clock rate (some architectures don't
+		 * use the common clock framework yet and may not implement
+		 * all the clk API calls for every clock), try the next best
+		 * thing: adjusting the clock divider, unless clk_get_rate()
+		 * failed as well.
+		 */
+		if (!clk_rate) {
+			/* Nothing more we can do. Just bail out. */
+			dev_err(dev->dev,
+				"failed to set the pixel clock - unable to read current lcdc clock rate\n");
+			return;
+		}
 
-	return true;
-}
+		clkdiv = DIV_ROUND_CLOSEST(clk_rate, req_rate);
 
-static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	struct tilcdc_drm_private *priv = dev->dev_private;
-	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
-	const unsigned clkdiv = 2; /* using a fixed divider of 2 */
-	int ret;
+		/*
+		 * Emit a warning if the real clock rate resulting from the
+		 * calculated divider differs much from the requested rate.
+		 *
+		 * 5% is an arbitrary value - LCDs are usually quite tolerant
+		 * about pixel clock rates.
+		 */
+		real_rate = clkdiv * req_rate;
 
-	/* mode.clock is in KHz, set_rate wants parameter in Hz */
-	ret = clk_set_rate(priv->clk, crtc->mode.clock * 1000 * clkdiv);
-	if (ret < 0) {
-		dev_err(dev->dev, "failed to set display clock rate to: %d\n",
-			crtc->mode.clock);
-		return;
+		if (tilcdc_pclk_diff(clk_rate, real_rate) > 5) {
+			dev_warn(dev->dev,
+				 "effective pixel clock rate (%luHz) differs from the calculated rate (%luHz)\n",
+				 clk_rate, real_rate);
+		}
 	}
 
-	tilcdc_crtc->lcd_fck_rate = clk_get_rate(priv->clk);
+	tilcdc_crtc->lcd_fck_rate = clk_rate;
 
 	DBG("lcd_clk=%u, mode clock=%d, div=%u",
 	    tilcdc_crtc->lcd_fck_rate, crtc->mode.clock, clkdiv);
@@ -349,7 +291,7 @@ static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
 				LCDC_V2_CORE_CLK_EN);
 }
 
-static void tilcdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
+static void tilcdc_crtc_set_mode(struct drm_crtc *crtc)
 {
 	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 	struct drm_device *dev = crtc->dev;
@@ -359,8 +301,6 @@ static void tilcdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
 	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 	struct drm_framebuffer *fb = crtc->primary->state->fb;
 
-	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
-
 	if (WARN_ON(!info))
 		return;
 
@@ -509,15 +449,226 @@ static void tilcdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
 	else
 		tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);
 
-	drm_framebuffer_reference(fb);
+	tilcdc_crtc_set_clk(crtc);
+
+	tilcdc_crtc_load_palette(crtc);
 
 	set_scanout(crtc, fb);
 
-	tilcdc_crtc_set_clk(crtc);
+	drm_framebuffer_reference(fb);
 
 	crtc->hwmode = crtc->state->adjusted_mode;
 }
 
+static void tilcdc_crtc_enable(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+
+	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+	mutex_lock(&tilcdc_crtc->enable_lock);
+	if (tilcdc_crtc->enabled || tilcdc_crtc->shutdown) {
+		mutex_unlock(&tilcdc_crtc->enable_lock);
+		return;
+	}
+
+	pm_runtime_get_sync(dev->dev);
+
+	reset(crtc);
+
+	tilcdc_crtc_set_mode(crtc);
+
+	tilcdc_crtc_enable_irqs(dev);
+
+	tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_DUAL_FRAME_BUFFER_ENABLE);
+	tilcdc_write_mask(dev, LCDC_RASTER_CTRL_REG,
+			  LCDC_PALETTE_LOAD_MODE(DATA_ONLY),
+			  LCDC_PALETTE_LOAD_MODE_MASK);
+	tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
+
+	drm_crtc_vblank_on(crtc);
+
+	tilcdc_crtc->enabled = true;
+	mutex_unlock(&tilcdc_crtc->enable_lock);
+}
+
+static void tilcdc_crtc_off(struct drm_crtc *crtc, bool shutdown)
+{
+	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+	struct drm_device *dev = crtc->dev;
+	struct tilcdc_drm_private *priv = dev->dev_private;
+	int ret;
+
+	mutex_lock(&tilcdc_crtc->enable_lock);
+	if (shutdown)
+		tilcdc_crtc->shutdown = true;
+	if (!tilcdc_crtc->enabled) {
+		mutex_unlock(&tilcdc_crtc->enable_lock);
+		return;
+	}
+	tilcdc_crtc->frame_done = false;
+	tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
+
+	/*
+	 * Wait for framedone irq which will still come before putting
+	 * things to sleep..
+	 */
+	ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
+				 tilcdc_crtc->frame_done,
+				 msecs_to_jiffies(500));
+	if (ret == 0)
+		dev_err(dev->dev, "%s: timeout waiting for framedone\n",
+			__func__);
+
+	drm_crtc_vblank_off(crtc);
+
+	tilcdc_crtc_disable_irqs(dev);
+
+	pm_runtime_put_sync(dev->dev);
+
+	if (tilcdc_crtc->next_fb) {
+		drm_flip_work_queue(&tilcdc_crtc->unref_work,
+				    tilcdc_crtc->next_fb);
+		tilcdc_crtc->next_fb = NULL;
+	}
+
+	if (tilcdc_crtc->curr_fb) {
+		drm_flip_work_queue(&tilcdc_crtc->unref_work,
+				    tilcdc_crtc->curr_fb);
+		tilcdc_crtc->curr_fb = NULL;
+	}
+
+	drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq);
+	tilcdc_crtc->last_vblank = ktime_set(0, 0);
+
+	tilcdc_crtc->enabled = false;
+	mutex_unlock(&tilcdc_crtc->enable_lock);
+}
+
+static void tilcdc_crtc_disable(struct drm_crtc *crtc)
+{
+	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+	tilcdc_crtc_off(crtc, false);
+}
+
+void tilcdc_crtc_shutdown(struct drm_crtc *crtc)
+{
+	tilcdc_crtc_off(crtc, true);
+}
+
+static bool tilcdc_crtc_is_on(struct drm_crtc *crtc)
+{
+	return crtc->state && crtc->state->enable && crtc->state->active;
+}
+
+static void tilcdc_crtc_recover_work(struct work_struct *work)
+{
+	struct tilcdc_crtc *tilcdc_crtc =
+		container_of(work, struct tilcdc_crtc, recover_work);
+	struct drm_crtc *crtc = &tilcdc_crtc->base;
+
+	dev_info(crtc->dev->dev, "%s: Reset CRTC", __func__);
+
+	drm_modeset_lock_crtc(crtc, NULL);
+
+	if (!tilcdc_crtc_is_on(crtc))
+		goto out;
+
+	tilcdc_crtc_disable(crtc);
+	tilcdc_crtc_enable(crtc);
+out:
+	drm_modeset_unlock_crtc(crtc);
+}
+
+static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
+{
+	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+	struct tilcdc_drm_private *priv = crtc->dev->dev_private;
+
+	drm_modeset_lock_crtc(crtc, NULL);
+	tilcdc_crtc_disable(crtc);
+	drm_modeset_unlock_crtc(crtc);
+
+	flush_workqueue(priv->wq);
+
+	of_node_put(crtc->port);
+	drm_crtc_cleanup(crtc);
+	drm_flip_work_cleanup(&tilcdc_crtc->unref_work);
+}
+
+int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
+		struct drm_framebuffer *fb,
+		struct drm_pending_vblank_event *event)
+{
+	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+	struct drm_device *dev = crtc->dev;
+	unsigned long flags;
+
+	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+
+	if (tilcdc_crtc->event) {
+		dev_err(dev->dev, "already pending page flip!\n");
+		return -EBUSY;
+	}
+
+	drm_framebuffer_reference(fb);
+
+	crtc->primary->fb = fb;
+
+	spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
+
+	if (crtc->hwmode.vrefresh && ktime_to_ns(tilcdc_crtc->last_vblank)) {
+		ktime_t next_vblank;
+		s64 tdiff;
+
+		next_vblank = ktime_add_us(tilcdc_crtc->last_vblank,
+			1000000 / crtc->hwmode.vrefresh);
+
+		tdiff = ktime_to_us(ktime_sub(next_vblank, ktime_get()));
+
+		if (tdiff < TILCDC_VBLANK_SAFETY_THRESHOLD_US)
+			tilcdc_crtc->next_fb = fb;
+	}
+
+	if (tilcdc_crtc->next_fb != fb)
+		set_scanout(crtc, fb);
+
+	tilcdc_crtc->event = event;
+
+	spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
+
+	return 0;
+}
+
+static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
+		const struct drm_display_mode *mode,
+		struct drm_display_mode *adjusted_mode)
+{
+	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+
+	if (!tilcdc_crtc->simulate_vesa_sync)
+		return true;
+
+	/*
+	 * tilcdc does not generate VESA-compliant sync but aligns
+	 * VS on the second edge of HS instead of first edge.
+	 * We use adjusted_mode, to fixup sync by aligning both rising
+	 * edges and add HSKEW offset to fix the sync.
+	 */
+	adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
+	adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
+
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
+		adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
+		adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
+	} else {
+		adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
+		adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
+	}
+
+	return true;
+}
+
 static int tilcdc_crtc_atomic_check(struct drm_crtc *crtc,
 				    struct drm_crtc_state *state)
 {
@@ -558,7 +709,6 @@ static const struct drm_crtc_helper_funcs tilcdc_crtc_helper_funcs = {
 		.enable		= tilcdc_crtc_enable,
 		.disable	= tilcdc_crtc_disable,
 		.atomic_check	= tilcdc_crtc_atomic_check,
-		.mode_set_nofb	= tilcdc_crtc_mode_set_nofb,
 };
 
 int tilcdc_crtc_max_width(struct drm_crtc *crtc)
@@ -754,28 +904,48 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 	}
 
 	if (stat & LCDC_FIFO_UNDERFLOW)
-		dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
+		dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underflow",
 				    __func__, stat);
 
-	/* For revision 2 only */
-	if (priv->rev == 2) {
-		if (stat & LCDC_FRAME_DONE) {
-			tilcdc_crtc->frame_done = true;
-			wake_up(&tilcdc_crtc->frame_done_wq);
-		}
+	if (stat & LCDC_PL_LOAD_DONE) {
+		complete(&tilcdc_crtc->palette_loaded);
+		if (priv->rev == 1)
+			tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
+				     LCDC_V1_PL_INT_ENA);
+		else
+			tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
+				     LCDC_V2_PL_INT_ENA);
+	}
 
-		if (stat & LCDC_SYNC_LOST) {
-			dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
-					    __func__, stat);
-			tilcdc_crtc->frame_intact = false;
-			if (tilcdc_crtc->sync_lost_count++ >
-			    SYNC_LOST_COUNT_LIMIT) {
-				dev_err(dev->dev, "%s(0x%08x): Sync lost flood detected, disabling the interrupt", __func__, stat);
+	if (stat & LCDC_SYNC_LOST) {
+		dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
+				    __func__, stat);
+		tilcdc_crtc->frame_intact = false;
+		if (tilcdc_crtc->sync_lost_count++ >
+		    SYNC_LOST_COUNT_LIMIT) {
+			dev_err(dev->dev, "%s(0x%08x): Sync lost flood detected, recovering", __func__, stat);
+			queue_work(system_wq, &tilcdc_crtc->recover_work);
+			if (priv->rev == 1)
+				tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
+					     LCDC_V1_SYNC_LOST_INT_ENA);
+			else
 				tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 					     LCDC_SYNC_LOST);
-			}
+			tilcdc_crtc->sync_lost_count = 0;
 		}
+	}
+
+	if (stat & LCDC_FRAME_DONE) {
+		tilcdc_crtc->frame_done = true;
+		wake_up(&tilcdc_crtc->frame_done_wq);
+		/* rev 1 lcdc appears to hang if irq is not disbaled here */
+		if (priv->rev == 1)
+			tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
+				     LCDC_V1_FRAME_DONE_INT_ENA);
+	}
 
+	/* For revision 2 only */
+	if (priv->rev == 2) {
 		/* Indicate to LCDC that the interrupt service routine has
 		 * completed, see 13.3.6.1.6 in AM335x TRM.
 		 */
@@ -785,7 +955,7 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 	return IRQ_HANDLED;
 }
 
-struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
+int tilcdc_crtc_create(struct drm_device *dev)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
 	struct tilcdc_crtc *tilcdc_crtc;
@@ -795,21 +965,33 @@ struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
 	tilcdc_crtc = devm_kzalloc(dev->dev, sizeof(*tilcdc_crtc), GFP_KERNEL);
 	if (!tilcdc_crtc) {
 		dev_err(dev->dev, "allocation failed\n");
-		return NULL;
+		return -ENOMEM;
 	}
 
+	init_completion(&tilcdc_crtc->palette_loaded);
+	tilcdc_crtc->palette_base = dmam_alloc_coherent(dev->dev,
+					TILCDC_PALETTE_SIZE,
+					&tilcdc_crtc->palette_dma_handle,
+					GFP_KERNEL | __GFP_ZERO);
+	if (!tilcdc_crtc->palette_base)
+		return -ENOMEM;
+	*tilcdc_crtc->palette_base = TILCDC_PALETTE_FIRST_ENTRY;
+
 	crtc = &tilcdc_crtc->base;
 
 	ret = tilcdc_plane_init(dev, &tilcdc_crtc->primary);
 	if (ret < 0)
 		goto fail;
 
+	mutex_init(&tilcdc_crtc->enable_lock);
+
 	init_waitqueue_head(&tilcdc_crtc->frame_done_wq);
 
 	drm_flip_work_init(&tilcdc_crtc->unref_work,
 			"unref", unref_worker);
 
 	spin_lock_init(&tilcdc_crtc->irq_lock);
+	INIT_WORK(&tilcdc_crtc->recover_work, tilcdc_crtc_recover_work);
 
 	ret = drm_crtc_init_with_planes(dev, crtc,
 					&tilcdc_crtc->primary,
@@ -835,13 +1017,15 @@ struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
 		if (!crtc->port) { /* This should never happen */
 			dev_err(dev->dev, "Port node not found in %s\n",
 				dev->dev->of_node->full_name);
+			ret = -EINVAL;
 			goto fail;
 		}
 	}
 
-	return crtc;
+	priv->crtc = crtc;
+	return 0;
 
 fail:
 	tilcdc_crtc_destroy(crtc);
-	return NULL;
+	return -ENOMEM;
 }

drivers/gpu/drm/tilcdc/tilcdc_drv.c

@@ -127,18 +127,12 @@ static int tilcdc_commit(struct drm_device *dev,
 	 * current layout.
 	 */
 
-	/* Keep HW on while we commit the state. */
-	pm_runtime_get_sync(dev->dev);
-
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
 	drm_atomic_helper_commit_planes(dev, state, 0);
 
 	drm_atomic_helper_commit_modeset_enables(dev, state);
 
-	/* Now HW should remain on if need becase the crtc is enabled */
-	pm_runtime_put_sync(dev->dev);
-
 	drm_atomic_helper_wait_for_vblanks(dev, state);
 
 	drm_atomic_helper_cleanup_planes(dev, state);
@@ -153,15 +147,11 @@ static const struct drm_mode_config_funcs mode_config_funcs = {
 	.atomic_commit = tilcdc_commit,
 };
 
-static int modeset_init(struct drm_device *dev)
+static void modeset_init(struct drm_device *dev)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
 	struct tilcdc_module *mod;
 
-	drm_mode_config_init(dev);
-
-	priv->crtc = tilcdc_crtc_create(dev);
-
 	list_for_each_entry(mod, &module_list, list) {
 		DBG("loading module: %s", mod->name);
 		mod->funcs->modeset_init(mod, dev);
@@ -172,8 +162,6 @@ static int modeset_init(struct drm_device *dev)
 	dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
 	dev->mode_config.max_height = 2048;
 	dev->mode_config.funcs = &mode_config_funcs;
-
-	return 0;
 }
 
 #ifdef CONFIG_CPU_FREQ
@@ -194,22 +182,29 @@ static int cpufreq_transition(struct notifier_block *nb,
  * DRM operations:
  */
 
-static int tilcdc_unload(struct drm_device *dev)
+static void tilcdc_fini(struct drm_device *dev)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
 
-	tilcdc_remove_external_encoders(dev);
+	if (priv->crtc)
+		tilcdc_crtc_shutdown(priv->crtc);
+
+	if (priv->is_registered)
+		drm_dev_unregister(dev);
 
-	drm_fbdev_cma_fini(priv->fbdev);
 	drm_kms_helper_poll_fini(dev);
-	drm_mode_config_cleanup(dev);
-	drm_vblank_cleanup(dev);
+
+	if (priv->fbdev)
+		drm_fbdev_cma_fini(priv->fbdev);
 
 	drm_irq_uninstall(dev);
+	drm_mode_config_cleanup(dev);
+	tilcdc_remove_external_device(dev);
 
 #ifdef CONFIG_CPU_FREQ
-	cpufreq_unregister_notifier(&priv->freq_transition,
-			CPUFREQ_TRANSITION_NOTIFIER);
+	if (priv->freq_transition.notifier_call)
+		cpufreq_unregister_notifier(&priv->freq_transition,
+					    CPUFREQ_TRANSITION_NOTIFIER);
 #endif
 
 	if (priv->clk)
@@ -218,61 +213,71 @@ static int tilcdc_unload(struct drm_device *dev)
 	if (priv->mmio)
 		iounmap(priv->mmio);
 
-	flush_workqueue(priv->wq);
-	destroy_workqueue(priv->wq);
+	if (priv->wq) {
+		flush_workqueue(priv->wq);
+		destroy_workqueue(priv->wq);
+	}
 
 	dev->dev_private = NULL;
 
 	pm_runtime_disable(dev->dev);
 
-	return 0;
+	drm_dev_unref(dev);
 }
 
-static int tilcdc_load(struct drm_device *dev, unsigned long flags)
+static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
 {
-	struct platform_device *pdev = dev->platformdev;
-	struct device_node *node = pdev->dev.of_node;
+	struct drm_device *ddev;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct device_node *node = dev->of_node;
 	struct tilcdc_drm_private *priv;
 	struct resource *res;
 	u32 bpp = 0;
 	int ret;
 
-	priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv) {
-		dev_err(dev->dev, "failed to allocate private data\n");
+		dev_err(dev, "failed to allocate private data\n");
 		return -ENOMEM;
 	}
 
-	dev->dev_private = priv;
+	ddev = drm_dev_alloc(ddrv, dev);
+	if (IS_ERR(ddev))
+		return PTR_ERR(ddev);
+
+	ddev->platformdev = pdev;
+	ddev->dev_private = priv;
+	platform_set_drvdata(pdev, ddev);
+	drm_mode_config_init(ddev);
 
 	priv->is_componentized =
-		tilcdc_get_external_components(dev->dev, NULL) > 0;
+		tilcdc_get_external_components(dev, NULL) > 0;
 
 	priv->wq = alloc_ordered_workqueue("tilcdc", 0);
 	if (!priv->wq) {
 		ret = -ENOMEM;
-		goto fail_unset_priv;
+		goto init_failed;
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
-		dev_err(dev->dev, "failed to get memory resource\n");
+		dev_err(dev, "failed to get memory resource\n");
 		ret = -EINVAL;
-		goto fail_free_wq;
+		goto init_failed;
 	}
 
 	priv->mmio = ioremap_nocache(res->start, resource_size(res));
 	if (!priv->mmio) {
-		dev_err(dev->dev, "failed to ioremap\n");
+		dev_err(dev, "failed to ioremap\n");
 		ret = -ENOMEM;
-		goto fail_free_wq;
+		goto init_failed;
 	}
 
-	priv->clk = clk_get(dev->dev, "fck");
+	priv->clk = clk_get(dev, "fck");
 	if (IS_ERR(priv->clk)) {
-		dev_err(dev->dev, "failed to get functional clock\n");
+		dev_err(dev, "failed to get functional clock\n");
 		ret = -ENODEV;
-		goto fail_iounmap;
+		goto init_failed;
 	}
 
 #ifdef CONFIG_CPU_FREQ
@@ -280,8 +285,9 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 	ret = cpufreq_register_notifier(&priv->freq_transition,
 			CPUFREQ_TRANSITION_NOTIFIER);
 	if (ret) {
-		dev_err(dev->dev, "failed to register cpufreq notifier\n");
-		goto fail_put_clk;
+		dev_err(dev, "failed to register cpufreq notifier\n");
+		priv->freq_transition.notifier_call = NULL;
+		goto init_failed;
 	}
 #endif
 
@@ -290,22 +296,22 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 
 	DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
 
-	if (of_property_read_u32(node, "ti,max-width", &priv->max_width))
+	if (of_property_read_u32(node, "max-width", &priv->max_width))
 		priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
 
 	DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
 
-	if (of_property_read_u32(node, "ti,max-pixelclock",
+	if (of_property_read_u32(node, "max-pixelclock",
 					&priv->max_pixelclock))
 		priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
 
 	DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
 
-	pm_runtime_enable(dev->dev);
+	pm_runtime_enable(dev);
 
 	/* Determine LCD IP Version */
-	pm_runtime_get_sync(dev->dev);
-	switch (tilcdc_read(dev, LCDC_PID_REG)) {
+	pm_runtime_get_sync(dev);
+	switch (tilcdc_read(ddev, LCDC_PID_REG)) {
 	case 0x4c100102:
 		priv->rev = 1;
 		break;
@@ -314,14 +320,14 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 		priv->rev = 2;
 		break;
 	default:
-		dev_warn(dev->dev, "Unknown PID Reg value 0x%08x, "
-				"defaulting to LCD revision 1\n",
-				tilcdc_read(dev, LCDC_PID_REG));
+		dev_warn(dev, "Unknown PID Reg value 0x%08x, "
+			"defaulting to LCD revision 1\n",
+			tilcdc_read(ddev, LCDC_PID_REG));
 		priv->rev = 1;
 		break;
 	}
 
-	pm_runtime_put_sync(dev->dev);
+	pm_runtime_put_sync(dev);
 
 	if (priv->rev == 1) {
 		DBG("Revision 1 LCDC supports only RGB565 format");
@@ -354,91 +360,67 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 		}
 	}
 
-	ret = modeset_init(dev);
+	ret = tilcdc_crtc_create(ddev);
 	if (ret < 0) {
-		dev_err(dev->dev, "failed to initialize mode setting\n");
-		goto fail_cpufreq_unregister;
+		dev_err(dev, "failed to create crtc\n");
+		goto init_failed;
 	}
-
-	platform_set_drvdata(pdev, dev);
+	modeset_init(ddev);
 
 	if (priv->is_componentized) {
-		ret = component_bind_all(dev->dev, dev);
+		ret = component_bind_all(dev, ddev);
 		if (ret < 0)
-			goto fail_mode_config_cleanup;
+			goto init_failed;
 
-		ret = tilcdc_add_external_encoders(dev);
+		ret = tilcdc_add_component_encoder(ddev);
 		if (ret < 0)
-			goto fail_component_cleanup;
+			goto init_failed;
+	} else {
+		ret = tilcdc_attach_external_device(ddev);
+		if (ret)
+			goto init_failed;
 	}
 
-	if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
-		dev_err(dev->dev, "no encoders/connectors found\n");
+	if (!priv->external_connector &&
+	    ((priv->num_encoders == 0) || (priv->num_connectors == 0))) {
+		dev_err(dev, "no encoders/connectors found\n");
 		ret = -ENXIO;
-		goto fail_external_cleanup;
+		goto init_failed;
 	}
 
-	ret = drm_vblank_init(dev, 1);
+	ret = drm_vblank_init(ddev, 1);
 	if (ret < 0) {
-		dev_err(dev->dev, "failed to initialize vblank\n");
-		goto fail_external_cleanup;
+		dev_err(dev, "failed to initialize vblank\n");
+		goto init_failed;
 	}
 
-	ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
+	ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
 	if (ret < 0) {
-		dev_err(dev->dev, "failed to install IRQ handler\n");
-		goto fail_vblank_cleanup;
+		dev_err(dev, "failed to install IRQ handler\n");
+		goto init_failed;
 	}
 
-	drm_mode_config_reset(dev);
+	drm_mode_config_reset(ddev);
 
-	priv->fbdev = drm_fbdev_cma_init(dev, bpp,
-			dev->mode_config.num_crtc,
-			dev->mode_config.num_connector);
+	priv->fbdev = drm_fbdev_cma_init(ddev, bpp,
+			ddev->mode_config.num_crtc,
+			ddev->mode_config.num_connector);
 	if (IS_ERR(priv->fbdev)) {
 		ret = PTR_ERR(priv->fbdev);
-		goto fail_irq_uninstall;
+		goto init_failed;
 	}
 
-	drm_kms_helper_poll_init(dev);
+	drm_kms_helper_poll_init(ddev);
 
-	return 0;
-
-fail_irq_uninstall:
-	drm_irq_uninstall(dev);
-
-fail_vblank_cleanup:
-	drm_vblank_cleanup(dev);
-
-fail_component_cleanup:
-	if (priv->is_componentized)
-		component_unbind_all(dev->dev, dev);
-
-fail_mode_config_cleanup:
-	drm_mode_config_cleanup(dev);
-
-fail_external_cleanup:
-	tilcdc_remove_external_encoders(dev);
-
-fail_cpufreq_unregister:
-	pm_runtime_disable(dev->dev);
-#ifdef CONFIG_CPU_FREQ
-	cpufreq_unregister_notifier(&priv->freq_transition,
-			CPUFREQ_TRANSITION_NOTIFIER);
-
-fail_put_clk:
-#endif
-	clk_put(priv->clk);
-
-fail_iounmap:
-	iounmap(priv->mmio);
+	ret = drm_dev_register(ddev, 0);
+	if (ret)
+		goto init_failed;
 
-fail_free_wq:
-	flush_workqueue(priv->wq);
-	destroy_workqueue(priv->wq);
+	priv->is_registered = true;
+	return 0;
 
-fail_unset_priv:
-	dev->dev_private = NULL;
+init_failed:
+	tilcdc_fini(ddev);
 
 	return ret;
 }
@@ -583,8 +565,6 @@ static const struct file_operations fops = {
 static struct drm_driver tilcdc_driver = {
 	.driver_features    = (DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET |
 			       DRIVER_PRIME | DRIVER_ATOMIC),
-	.load               = tilcdc_load,
-	.unload             = tilcdc_unload,
 	.lastclose          = tilcdc_lastclose,
 	.irq_handler        = tilcdc_irq,
 	.get_vblank_counter = drm_vblank_no_hw_counter,
@@ -658,10 +638,9 @@ static const struct dev_pm_ops tilcdc_pm_ops = {
 /*
  * Platform driver:
  */
-
 static int tilcdc_bind(struct device *dev)
 {
-	return drm_platform_init(&tilcdc_driver, to_platform_device(dev));
+	return tilcdc_init(&tilcdc_driver, dev);
 }
 
 static void tilcdc_unbind(struct device *dev)
@@ -672,7 +651,7 @@ static void tilcdc_unbind(struct device *dev)
 	if (!ddev->dev_private)
 		return;
 
-	drm_put_dev(dev_get_drvdata(dev));
+	tilcdc_fini(dev_get_drvdata(dev));
 }
 
 static const struct component_master_ops tilcdc_comp_ops = {
@@ -695,7 +674,7 @@ static int tilcdc_pdev_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 	else if (ret == 0)
-		return drm_platform_init(&tilcdc_driver, pdev);
+		return tilcdc_init(&tilcdc_driver, &pdev->dev);
 	else
 		return component_master_add_with_match(&pdev->dev,
 						       &tilcdc_comp_ops,
@@ -710,7 +689,7 @@ static int tilcdc_pdev_remove(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 	else if (ret == 0)
-		drm_put_dev(platform_get_drvdata(pdev));
+		tilcdc_fini(platform_get_drvdata(pdev));
 	else
 		component_master_del(&pdev->dev, &tilcdc_comp_ops);
 
@@ -719,6 +698,7 @@ static int tilcdc_pdev_remove(struct platform_device *pdev)
 
 static struct of_device_id tilcdc_of_match[] = {
 		{ .compatible = "ti,am33xx-tilcdc", },
+		{ .compatible = "ti,da850-tilcdc", },
 		{ },
 };
 MODULE_DEVICE_TABLE(of, tilcdc_of_match);

drivers/gpu/drm/tilcdc/tilcdc_drv.h

@@ -33,6 +33,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_bridge.h>
 
 /* Defaulting to pixel clock defined on AM335x */
 #define TILCDC_DEFAULT_MAX_PIXELCLOCK  126000
@@ -87,8 +88,12 @@ struct tilcdc_drm_private {
 
 	unsigned int num_connectors;
 	struct drm_connector *connectors[8];
-	const struct drm_connector_helper_funcs *connector_funcs[8];
 
+	struct drm_encoder *external_encoder;
+	struct drm_connector *external_connector;
+	const struct drm_connector_helper_funcs *connector_funcs;
+
+	bool is_registered;
 	bool is_componentized;
 };
 
@@ -163,7 +168,7 @@ struct tilcdc_panel_info {
 
 #define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
 
-struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev);
+int tilcdc_crtc_create(struct drm_device *dev);
 irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc);
 void tilcdc_crtc_update_clk(struct drm_crtc *crtc);
 void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
@@ -172,7 +177,7 @@ void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
 					bool simulate_vesa_sync);
 int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode);
 int tilcdc_crtc_max_width(struct drm_crtc *crtc);
-void tilcdc_crtc_disable(struct drm_crtc *crtc);
+void tilcdc_crtc_shutdown(struct drm_crtc *crtc);
 int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
 		struct drm_framebuffer *fb,
 		struct drm_pending_vblank_event *event);

drivers/gpu/drm/tilcdc/tilcdc_external.c

@@ -28,44 +28,50 @@ static const struct tilcdc_panel_info panel_info_tda998x = {
 		.raster_order           = 0,
 };
 
+static const struct tilcdc_panel_info panel_info_default = {
+		.ac_bias                = 255,
+		.ac_bias_intrpt         = 0,
+		.dma_burst_sz           = 16,
+		.bpp                    = 16,
+		.fdd                    = 0x80,
+		.tft_alt_mode           = 0,
+		.sync_edge              = 0,
+		.sync_ctrl              = 1,
+		.raster_order           = 0,
+};
+
 static int tilcdc_external_mode_valid(struct drm_connector *connector,
 				      struct drm_display_mode *mode)
 {
 	struct tilcdc_drm_private *priv = connector->dev->dev_private;
-	int ret, i;
+	int ret;
 
 	ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
 	if (ret != MODE_OK)
 		return ret;
 
-	for (i = 0; i < priv->num_connectors &&
-		     priv->connectors[i] != connector; i++)
-		;
-
-	BUG_ON(priv->connectors[i] != connector);
-	BUG_ON(!priv->connector_funcs[i]);
+	BUG_ON(priv->external_connector != connector);
+	BUG_ON(!priv->connector_funcs);
 
 	/* If the connector has its own mode_valid call it. */
-	if (!IS_ERR(priv->connector_funcs[i]) &&
-	    priv->connector_funcs[i]->mode_valid)
-		return priv->connector_funcs[i]->mode_valid(connector, mode);
+	if (!IS_ERR(priv->connector_funcs) &&
+	    priv->connector_funcs->mode_valid)
+		return priv->connector_funcs->mode_valid(connector, mode);
 
 	return MODE_OK;
 }
 
-static int tilcdc_add_external_encoder(struct drm_device *dev,
-				       struct drm_connector *connector)
+static int tilcdc_add_external_connector(struct drm_device *dev,
+					 struct drm_connector *connector)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
 	struct drm_connector_helper_funcs *connector_funcs;
 
-	priv->connectors[priv->num_connectors] = connector;
-	priv->encoders[priv->num_encoders++] = connector->encoder;
-
-	/* Only tda998x is supported at the moment. */
-	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
-	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
+	/* There should never be more than one connector */
+	if (WARN_ON(priv->external_connector))
+		return -EINVAL;
 
+	priv->external_connector = connector;
 	connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
 				       GFP_KERNEL);
 	if (!connector_funcs)
@@ -78,56 +84,177 @@ static int tilcdc_add_external_encoder(struct drm_device *dev,
 	 * everything else but use our own mode_valid() (above).
 	 */
 	if (connector->helper_private) {
-		priv->connector_funcs[priv->num_connectors] =
-			connector->helper_private;
-		*connector_funcs = *priv->connector_funcs[priv->num_connectors];
+		priv->connector_funcs =	connector->helper_private;
+		*connector_funcs = *priv->connector_funcs;
 	} else {
-		priv->connector_funcs[priv->num_connectors] = ERR_PTR(-ENOENT);
+		priv->connector_funcs = ERR_PTR(-ENOENT);
 	}
 	connector_funcs->mode_valid = tilcdc_external_mode_valid;
 	drm_connector_helper_add(connector, connector_funcs);
-	priv->num_connectors++;
 
-	dev_dbg(dev->dev, "External encoder '%s' connected\n",
-		connector->encoder->name);
+	dev_dbg(dev->dev, "External connector '%s' connected\n",
+		connector->name);
 
 	return 0;
 }
 
-int tilcdc_add_external_encoders(struct drm_device *dev)
+static
+struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
+						    struct drm_encoder *encoder)
 {
-	struct tilcdc_drm_private *priv = dev->dev_private;
 	struct drm_connector *connector;
-	int num_internal_connectors = priv->num_connectors;
-
-	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-		bool found = false;
-		int i, ret;
-
-		for (i = 0; i < num_internal_connectors; i++)
-			if (connector == priv->connectors[i])
-				found = true;
-		if (!found) {
-			ret = tilcdc_add_external_encoder(dev, connector);
-			if (ret)
-				return ret;
-		}
+	int i;
+
+	list_for_each_entry(connector, &ddev->mode_config.connector_list, head)
+		for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
+			if (connector->encoder_ids[i] == encoder->base.id)
+				return connector;
+
+	dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
+		encoder->name, encoder->base.id);
+
+	return NULL;
+}
+
+int tilcdc_add_component_encoder(struct drm_device *ddev)
+{
+	struct tilcdc_drm_private *priv = ddev->dev_private;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
+
+	list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
+		if (encoder->possible_crtcs & (1 << priv->crtc->index))
+			break;
+
+	if (!encoder) {
+		dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
+		return -ENODEV;
 	}
-	return 0;
+
+	connector = tilcdc_encoder_find_connector(ddev, encoder);
+
+	if (!connector)
+		return -ENODEV;
+
+	/* Only tda998x is supported at the moment. */
+	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
+	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
+
+	return tilcdc_add_external_connector(ddev, connector);
 }
 
-void tilcdc_remove_external_encoders(struct drm_device *dev)
+void tilcdc_remove_external_device(struct drm_device *dev)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
-	int i;
 
 	/* Restore the original helper functions, if any. */
-	for (i = 0; i < priv->num_connectors; i++)
-		if (IS_ERR(priv->connector_funcs[i]))
-			drm_connector_helper_add(priv->connectors[i], NULL);
-		else if (priv->connector_funcs[i])
-			drm_connector_helper_add(priv->connectors[i],
-						 priv->connector_funcs[i]);
+	if (IS_ERR(priv->connector_funcs))
+		drm_connector_helper_add(priv->external_connector, NULL);
+	else if (priv->connector_funcs)
+		drm_connector_helper_add(priv->external_connector,
+					 priv->connector_funcs);
+}
+
+static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
+	.destroy	= drm_encoder_cleanup,
+};
+
+static
+int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
+{
+	struct tilcdc_drm_private *priv = ddev->dev_private;
+	struct drm_connector *connector;
+	int ret;
+
+	priv->external_encoder->possible_crtcs = BIT(0);
+	priv->external_encoder->bridge = bridge;
+	bridge->encoder = priv->external_encoder;
+
+	ret = drm_bridge_attach(ddev, bridge);
+	if (ret) {
+		dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
+		return ret;
+	}
+
+	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
+
+	connector = tilcdc_encoder_find_connector(ddev, priv->external_encoder);
+	if (!connector)
+		return -ENODEV;
+
+	ret = tilcdc_add_external_connector(ddev, connector);
+
+	return ret;
+}
+
+static int tilcdc_node_has_port(struct device_node *dev_node)
+{
+	struct device_node *node;
+
+	node = of_get_child_by_name(dev_node, "ports");
+	if (!node)
+		node = of_get_child_by_name(dev_node, "port");
+	if (!node)
+		return 0;
+	of_node_put(node);
+
+	return 1;
+}
+
+static
+struct device_node *tilcdc_get_remote_node(struct device_node *node)
+{
+	struct device_node *ep;
+	struct device_node *parent;
+
+	if (!tilcdc_node_has_port(node))
+		return NULL;
+
+	ep = of_graph_get_next_endpoint(node, NULL);
+	if (!ep)
+		return NULL;
+
+	parent = of_graph_get_remote_port_parent(ep);
+	of_node_put(ep);
+
+	return parent;
+}
+
+int tilcdc_attach_external_device(struct drm_device *ddev)
+{
+	struct tilcdc_drm_private *priv = ddev->dev_private;
+	struct device_node *remote_node;
+	struct drm_bridge *bridge;
+	int ret;
+
+	remote_node = tilcdc_get_remote_node(ddev->dev->of_node);
+	if (!remote_node)
+		return 0;
+
+	bridge = of_drm_find_bridge(remote_node);
+	of_node_put(remote_node);
+	if (!bridge)
+		return -EPROBE_DEFER;
+
+	priv->external_encoder = devm_kzalloc(ddev->dev,
+					      sizeof(*priv->external_encoder),
+					      GFP_KERNEL);
+	if (!priv->external_encoder)
+		return -ENOMEM;
+
+	ret = drm_encoder_init(ddev, priv->external_encoder,
+			       &tilcdc_external_encoder_funcs,
+			       DRM_MODE_ENCODER_NONE, NULL);
+	if (ret) {
+		dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
+		return ret;
+	}
+
+	ret = tilcdc_attach_bridge(ddev, bridge);
+	if (ret)
+		drm_encoder_cleanup(priv->external_encoder);
+
+	return ret;
 }
 
 static int dev_match_of(struct device *dev, void *data)
@@ -141,16 +268,10 @@ int tilcdc_get_external_components(struct device *dev,
 	struct device_node *node;
 	struct device_node *ep = NULL;
 	int count = 0;
+	int ret = 0;
 
-	/* Avoid error print by of_graph_get_next_endpoint() if there
-	 * is no ports present.
-	 */
-	node = of_get_child_by_name(dev->of_node, "ports");
-	if (!node)
-		node = of_get_child_by_name(dev->of_node, "port");
-	if (!node)
+	if (!tilcdc_node_has_port(dev->of_node))
 		return 0;
-	of_node_put(node);
 
 	while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
 		node = of_graph_get_remote_port_parent(ep);
@@ -160,17 +281,20 @@ int tilcdc_get_external_components(struct device *dev,
 		}
 
 		dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
-		if (match)
-			drm_of_component_match_add(dev, match, dev_match_of,
-						   node);
-		of_node_put(node);
-		count++;
-	}
 
-	if (count > 1) {
-		dev_err(dev, "Only one external encoder is supported\n");
-		return -EINVAL;
+		if (of_device_is_compatible(node, "nxp,tda998x")) {
+			if (match)
+				drm_of_component_match_add(dev, match,
+							   dev_match_of, node);
+			ret = 1;
+		}
+
+		of_node_put(node);
+		if (count++ > 1) {
+			dev_err(dev, "Only one port is supported\n");
+			return -EINVAL;
+		}
 	}
 
-	return count;
+	return ret;
 }

drivers/gpu/drm/tilcdc/tilcdc_external.h

@@ -18,8 +18,9 @@
 #ifndef __TILCDC_EXTERNAL_H__
 #define __TILCDC_EXTERNAL_H__
 
-int tilcdc_add_external_encoders(struct drm_device *dev);
-void tilcdc_remove_external_encoders(struct drm_device *dev);
+int tilcdc_add_component_encoder(struct drm_device *dev);
+void tilcdc_remove_external_device(struct drm_device *dev);
 int tilcdc_get_external_components(struct device *dev,
 				   struct component_match **match);
+int tilcdc_attach_external_device(struct drm_device *ddev);
 #endif /* __TILCDC_SLAVE_H__ */

drivers/gpu/drm/tilcdc/tilcdc_panel.c

@@ -240,8 +240,6 @@ static struct drm_connector *panel_connector_create(struct drm_device *dev,
 	if (ret)
 		goto fail;
 
-	drm_connector_register(connector);
-
 	return connector;
 
 fail:

drivers/gpu/drm/tilcdc/tilcdc_regs.h

@@ -34,11 +34,14 @@
 
 /* LCDC DMA Control Register */
 #define LCDC_DMA_BURST_SIZE(x)                   ((x) << 4)
+#define LCDC_DMA_BURST_SIZE_MASK                 ((0x7) << 4)
 #define LCDC_DMA_BURST_1                         0x0
 #define LCDC_DMA_BURST_2                         0x1
 #define LCDC_DMA_BURST_4                         0x2
 #define LCDC_DMA_BURST_8                         0x3
 #define LCDC_DMA_BURST_16                        0x4
+#define LCDC_DMA_FIFO_THRESHOLD(x)               ((x) << 8)
+#define LCDC_DMA_FIFO_THRESHOLD_MASK             ((0x3) << 8)
 #define LCDC_V1_END_OF_FRAME_INT_ENA             BIT(2)
 #define LCDC_V2_END_OF_FRAME0_INT_ENA            BIT(8)
 #define LCDC_V2_END_OF_FRAME1_INT_ENA            BIT(9)
@@ -46,10 +49,12 @@
 
 /* LCDC Control Register */
 #define LCDC_CLK_DIVISOR(x)                      ((x) << 8)
+#define LCDC_CLK_DIVISOR_MASK                    ((0xFF) << 8)
 #define LCDC_RASTER_MODE                         0x01
 
 /* LCDC Raster Control Register */
 #define LCDC_PALETTE_LOAD_MODE(x)                ((x) << 20)
+#define LCDC_PALETTE_LOAD_MODE_MASK              ((0x3) << 20)
 #define PALETTE_AND_DATA                         0x00
 #define PALETTE_ONLY                             0x01
 #define DATA_ONLY                                0x02
@@ -61,6 +66,8 @@
 #define LCDC_V2_UNDERFLOW_INT_ENA                BIT(5)
 #define LCDC_V1_PL_INT_ENA                       BIT(4)
 #define LCDC_V2_PL_INT_ENA                       BIT(6)
+#define LCDC_V1_SYNC_LOST_INT_ENA                BIT(5)
+#define LCDC_V1_FRAME_DONE_INT_ENA               BIT(3)
 #define LCDC_MONOCHROME_MODE                     BIT(1)
 #define LCDC_RASTER_ENABLE                       BIT(0)
 #define LCDC_TFT_ALT_ENABLE                      BIT(23)
@@ -74,7 +81,9 @@
 
 /* LCDC Raster Timing 2 Register */
 #define LCDC_AC_BIAS_TRANSITIONS_PER_INT(x)      ((x) << 16)
+#define LCDC_AC_BIAS_TRANSITIONS_PER_INT_MASK    ((0xF) << 16)
 #define LCDC_AC_BIAS_FREQUENCY(x)                ((x) << 8)
+#define LCDC_AC_BIAS_FREQUENCY_MASK              ((0xFF) << 8)
 #define LCDC_SYNC_CTRL                           BIT(25)
 #define LCDC_SYNC_EDGE                           BIT(24)
 #define LCDC_INVERT_PIXEL_CLOCK                  BIT(22)
@@ -139,6 +148,12 @@ static inline u32 tilcdc_read(struct drm_device *dev, u32 reg)
 	return ioread32(priv->mmio + reg);
 }
 
+static inline void tilcdc_write_mask(struct drm_device *dev, u32 reg,
+				     u32 val, u32 mask)
+{
+	tilcdc_write(dev, reg, (tilcdc_read(dev, reg) & ~mask) | (val & mask));
+}
+
 static inline void tilcdc_set(struct drm_device *dev, u32 reg, u32 mask)
 {
 	tilcdc_write(dev, reg, tilcdc_read(dev, reg) | mask);

drivers/gpu/drm/tilcdc/tilcdc_tfp410.c

@@ -249,8 +249,6 @@ static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 	if (ret)
 		goto fail;
 
-	drm_connector_register(connector);
-
 	return connector;
 
 fail: