[PATCH] drm/tve200: Replace custom connector with panel bridge

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This replaces the custom connector in the TVE200 with the
panel bridge helper. As long as we're just using panels
and no other bridges, this works just fine.

Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/gpu/drm/tve200/Kconfig            |   3 +-
 drivers/gpu/drm/tve200/Makefile           |   3 +-
 drivers/gpu/drm/tve200/tve200_connector.c | 125 ------------------------------
 drivers/gpu/drm/tve200/tve200_display.c   |  15 ++--
 drivers/gpu/drm/tve200/tve200_drm.h       |  14 ++--
 drivers/gpu/drm/tve200/tve200_drv.c       |  66 +++++++++++-----
 6 files changed, 63 insertions(+), 163 deletions(-)
 delete mode 100644 drivers/gpu/drm/tve200/tve200_connector.c

diff --git a/drivers/gpu/drm/tve200/Kconfig b/drivers/gpu/drm/tve200/Kconfig
index 21d9841ddb88..c5f03bf4570c 100644
--- a/drivers/gpu/drm/tve200/Kconfig
+++ b/drivers/gpu/drm/tve200/Kconfig
@@ -4,7 +4,8 @@ config DRM_TVE200
 	depends on CMA
 	depends on ARM || COMPILE_TEST
 	depends on OF
-	select DRM_PANEL
+	select DRM_BRIDGE
+	select DRM_PANEL_BRIDGE
 	select DRM_KMS_HELPER
 	select DRM_KMS_CMA_HELPER
 	select DRM_GEM_CMA_HELPER
diff --git a/drivers/gpu/drm/tve200/Makefile b/drivers/gpu/drm/tve200/Makefile
index a9dba54f7ee5..6b7a6a1dcbf8 100644
--- a/drivers/gpu/drm/tve200/Makefile
+++ b/drivers/gpu/drm/tve200/Makefile
@@ -1,5 +1,4 @@
-tve200_drm-y +=	tve200_connector.o \
-		tve200_display.o \
+tve200_drm-y +=	tve200_display.o \
 		tve200_drv.o
 
 obj-$(CONFIG_DRM_TVE200) += tve200_drm.o
diff --git a/drivers/gpu/drm/tve200/tve200_connector.c b/drivers/gpu/drm/tve200/tve200_connector.c
deleted file mode 100644
index 5e6c20b57d6d..000000000000
--- a/drivers/gpu/drm/tve200/tve200_connector.c
+++ /dev/null
@@ -1,125 +0,0 @@
-/*
- * Copyright (C) 2017 Linus Walleij <linus.walleij@xxxxxxxxxx>
- * Parts of this file were based on sources as follows:
- *
- * Copyright (C) 2006-2008 Intel Corporation
- * Copyright (C) 2007 Amos Lee <amos_lee@xxxxxxxxxxxxxxxx>
- * Copyright (C) 2007 Dave Airlie <airlied@xxxxxxxx>
- * Copyright (C) 2011 Texas Instruments
- * Copyright (C) 2017 Eric Anholt
- *
- * This program is free software and is provided to you under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation, and any use by you of this program is subject to the terms of
- * such GNU licence.
- */
-
-/**
- * tve200_drm_connector.c
- * Implementation of the connector functions for the Faraday TV Encoder
- */
-#include <linux/version.h>
-#include <linux/shmem_fs.h>
-#include <linux/dma-buf.h>
-
-#include <drm/drmP.h>
-#include <drm/drm_atomic_helper.h>
-#include <drm/drm_crtc_helper.h>
-#include <drm/drm_of.h>
-#include <drm/drm_panel.h>
-
-#include "tve200_drm.h"
-
-static void tve200_connector_destroy(struct drm_connector *connector)
-{
-	struct tve200_drm_connector *tve200con =
-		to_tve200_connector(connector);
-
-	if (tve200con->panel)
-		drm_panel_detach(tve200con->panel);
-
-	drm_connector_unregister(connector);
-	drm_connector_cleanup(connector);
-}
-
-static enum drm_connector_status tve200_connector_detect(struct drm_connector
-							*connector, bool force)
-{
-	struct tve200_drm_connector *tve200con =
-		to_tve200_connector(connector);
-
-	return (tve200con->panel ?
-		connector_status_connected :
-		connector_status_disconnected);
-}
-
-static int tve200_connector_helper_get_modes(struct drm_connector *connector)
-{
-	struct tve200_drm_connector *tve200con =
-		to_tve200_connector(connector);
-
-	if (!tve200con->panel)
-		return 0;
-
-	return drm_panel_get_modes(tve200con->panel);
-}
-
-static const struct drm_connector_funcs connector_funcs = {
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = tve200_connector_destroy,
-	.detect = tve200_connector_detect,
-	.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 const struct drm_connector_helper_funcs connector_helper_funcs = {
-	.get_modes = tve200_connector_helper_get_modes,
-};
-
-/*
- * Walks the OF graph to find the panel node and then asks DRM to look
- * up the panel.
- */
-static struct drm_panel *tve200_get_panel(struct device *dev)
-{
-	struct device_node *endpoint, *panel_node;
-	struct device_node *np = dev->of_node;
-	struct drm_panel *panel;
-
-	endpoint = of_graph_get_next_endpoint(np, NULL);
-	if (!endpoint) {
-		dev_err(dev, "no endpoint to fetch panel\n");
-		return NULL;
-	}
-
-	/* Don't proceed if we have an endpoint but no panel_node tied to it */
-	panel_node = of_graph_get_remote_port_parent(endpoint);
-	of_node_put(endpoint);
-	if (!panel_node) {
-		dev_err(dev, "no valid panel node\n");
-		return NULL;
-	}
-
-	panel = of_drm_find_panel(panel_node);
-	of_node_put(panel_node);
-
-	return panel;
-}
-
-int tve200_connector_init(struct drm_device *dev)
-{
-	struct tve200_drm_dev_private *priv = dev->dev_private;
-	struct tve200_drm_connector *tve200con = &priv->connector;
-	struct drm_connector *connector = &tve200con->connector;
-
-	drm_connector_init(dev, connector, &connector_funcs,
-			   DRM_MODE_CONNECTOR_DPI);
-	drm_connector_helper_add(connector, &connector_helper_funcs);
-
-	tve200con->panel = tve200_get_panel(dev->dev);
-	if (tve200con->panel)
-		drm_panel_attach(tve200con->panel, connector);
-
-	return 0;
-}
diff --git a/drivers/gpu/drm/tve200/tve200_display.c b/drivers/gpu/drm/tve200/tve200_display.c
index 37fb333331f3..cfdffc15a2ce 100644
--- a/drivers/gpu/drm/tve200/tve200_display.c
+++ b/drivers/gpu/drm/tve200/tve200_display.c
@@ -127,7 +127,7 @@ static void tve200_display_enable(struct drm_simple_display_pipe *pipe,
 	struct tve200_drm_dev_private *priv = drm->dev_private;
 	const struct drm_display_mode *mode = &cstate->mode;
 	struct drm_framebuffer *fb = plane->state->fb;
-	struct drm_connector *connector = &priv->connector.connector;
+	struct drm_connector *connector = priv->connector;
 	u32 format = fb->format->format;
 	u32 ctrl1 = 0;
 
@@ -215,13 +215,9 @@ static void tve200_display_enable(struct drm_simple_display_pipe *pipe,
 
 	ctrl1 |= TVE200_TVEEN;
 
-	drm_panel_prepare(priv->connector.panel);
-
 	/* Turn it on */
 	writel(ctrl1, priv->regs + TVE200_CTRL);
 
-	drm_panel_enable(priv->connector.panel);
-
 	drm_crtc_vblank_on(crtc);
 }
 
@@ -233,13 +229,9 @@ void tve200_display_disable(struct drm_simple_display_pipe *pipe)
 
 	drm_crtc_vblank_off(crtc);
 
-	drm_panel_disable(priv->connector.panel);
-
 	/* Disable and Power Down */
 	writel(0, priv->regs + TVE200_CTRL);
 
-	drm_panel_unprepare(priv->connector.panel);
-
 	clk_disable_unprepare(priv->clk);
 }
 
@@ -336,9 +328,12 @@ int tve200_display_init(struct drm_device *drm)
 	ret = drm_simple_display_pipe_init(drm, &priv->pipe,
 					   &tve200_display_funcs,
 					   formats, ARRAY_SIZE(formats),
-					   &priv->connector.connector);
+					   priv->connector);
 	if (ret)
 		return ret;
 
+	/* We need the encoder to attach the bridge */
+	priv->encoder = &priv->pipe.encoder;
+
 	return 0;
 }
diff --git a/drivers/gpu/drm/tve200/tve200_drm.h b/drivers/gpu/drm/tve200/tve200_drm.h
index f00fc47a6bd1..c7acfaa1a2c5 100644
--- a/drivers/gpu/drm/tve200/tve200_drm.h
+++ b/drivers/gpu/drm/tve200/tve200_drm.h
@@ -95,16 +95,18 @@
 
 #include <drm/drm_gem.h>
 #include <drm/drm_simple_kms_helper.h>
-
-struct tve200_drm_connector {
-	struct drm_connector connector;
-	struct drm_panel *panel;
-};
+#include <drm/drm_connector.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_bridge.h>
 
 struct tve200_drm_dev_private {
 	struct drm_device *drm;
 
-	struct tve200_drm_connector connector;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
 	struct drm_simple_display_pipe pipe;
 	struct drm_fbdev_cma *fbdev;
 
diff --git a/drivers/gpu/drm/tve200/tve200_drv.c b/drivers/gpu/drm/tve200/tve200_drv.c
index fe742106db4e..c22644692a88 100644
--- a/drivers/gpu/drm/tve200/tve200_drv.c
+++ b/drivers/gpu/drm/tve200/tve200_drv.c
@@ -47,6 +47,8 @@
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_panel.h>
+#include <drm/drm_of.h>
+#include <drm/drm_bridge.h>
 
 #include "tve200_drm.h"
 
@@ -62,6 +64,8 @@ static int tve200_modeset_init(struct drm_device *dev)
 {
 	struct drm_mode_config *mode_config;
 	struct tve200_drm_dev_private *priv = dev->dev_private;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
 	int ret = 0;
 
 	drm_mode_config_init(dev);
@@ -72,35 +76,51 @@ static int tve200_modeset_init(struct drm_device *dev)
 	mode_config->min_height = 240;
 	mode_config->max_height = 576;
 
-	ret = tve200_connector_init(dev);
+	ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
+					  0, 0, &panel, &bridge);
+	if (ret && ret != -ENODEV)
+		return ret;
+	if (panel) {
+		bridge = drm_panel_bridge_add(panel,
+					      DRM_MODE_CONNECTOR_Unknown);
+		if (IS_ERR(bridge)) {
+			ret = PTR_ERR(bridge);
+			goto out_bridge;
+		}
+	}
+
+	ret = tve200_display_init(dev);
 	if (ret) {
-		dev_err(dev->dev, "Failed to create tve200_drm_connector\n");
-		goto out_config;
+		dev_err(dev->dev, "failed to init display\n");
+		goto out_bridge;
+	}
+
+	if (bridge) {
+		ret = drm_bridge_attach(priv->encoder, bridge, NULL);
+		if (ret)
+			goto out_bridge;
 	}
 
 	/*
-	 * Don't actually attach if we didn't find a drm_panel
-	 * attached to us.
+	 * TODO: when we are using a different bridge than a panel
+	 * (such as a dumb VGA connector) we need to devise a different
+	 * method to get the connector out of the bridge.
 	 */
-	if (!priv->connector.panel) {
-		dev_info(dev->dev,
-			 "deferring due to lack of DRM panel device\n");
-		ret = -EPROBE_DEFER;
-		goto out_config;
+	if (!panel) {
+		dev_err(dev->dev, "the bridge is not a panel\n");
+		goto out_bridge;
 	}
-	dev_info(dev->dev, "attached to panel %s\n",
-		 dev_name(priv->connector.panel->dev));
+	priv->panel = panel;
+	priv->connector = panel->connector;
+	priv->bridge = bridge;
 
-	ret = tve200_display_init(dev);
-	if (ret) {
-		dev_err(dev->dev, "failed to init display\n");
-		goto out_config;
-	}
+	dev_info(dev->dev, "attached to panel %s\n",
+		 dev_name(panel->dev));
 
 	ret = drm_vblank_init(dev, 1);
 	if (ret) {
 		dev_err(dev->dev, "failed to init vblank\n");
-		goto out_config;
+		goto out_bridge;
 	}
 
 	drm_mode_config_reset(dev);
@@ -115,7 +135,11 @@ static int tve200_modeset_init(struct drm_device *dev)
 
 	goto finish;
 
-out_config:
+out_bridge:
+	if (panel)
+		drm_panel_bridge_remove(bridge);
+	else
+		drm_bridge_remove(bridge);
 	drm_mode_config_cleanup(dev);
 finish:
 	return ret;
@@ -249,6 +273,10 @@ static int tve200_remove(struct platform_device *pdev)
 	drm_dev_unregister(drm);
 	if (priv->fbdev)
 		drm_fbdev_cma_fini(priv->fbdev);
+	if (priv->panel)
+		drm_panel_bridge_remove(priv->bridge);
+	else
+		drm_bridge_remove(priv->bridge);
 	drm_mode_config_cleanup(drm);
 	clk_disable_unprepare(priv->pclk);
 	drm_dev_unref(drm);
-- 
2.13.5

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