[PATCH v8 01/17] drm: exynos: dp: convert to drm bridge mode

[Yakir Yang <ykk@rock-chips.com>]

In order to move exynos dp code to bridge directory,
we need to convert driver drm bridge mode first. As
dp driver already have a ptn3460 bridge, so we need
to move ptn bridge to the next bridge of dp bridge.

Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>
---
Changes in v8: None
Changes in v7: None
Changes in v6:
- Fix the wrong code in previous series, and test on Samsung snow Chromebook
  successfully, here are the detail changes:
=============>
-       if (!dp->panel && !dp->bridge) {
+       if (!dp->panel && !dp->ptn_bridge) {
                ret = exynos_dp_dt_parse_panel(dp);
                if (ret)
=============>
+       encoder->bridge = bridge;
	bridge->driver_private = dp;
        bridge->encoder = encoder;
        bridge->funcs = &exynos_dp_bridge_funcs;
        ret = drm_bridge_attach(drm_dev, bridge);

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2:
- Keep author name list no changed (Jingoo)

 drivers/gpu/drm/exynos/exynos_dp_core.c | 103 ++++++++++++++++++++++++--------
 drivers/gpu/drm/exynos/exynos_dp_core.h |   1 +
 2 files changed, 78 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
index 124fb9a..aedd074 100644
--- a/drivers/gpu/drm/exynos/exynos_dp_core.c
+++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
@@ -1009,9 +1009,9 @@ static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
 {
 	int ret;
 
-	encoder->bridge = dp->bridge;
-	dp->bridge->encoder = encoder;
-	ret = drm_bridge_attach(encoder->dev, dp->bridge);
+	encoder->bridge->next = dp->ptn_bridge;
+	dp->ptn_bridge->encoder = encoder;
+	ret = drm_bridge_attach(encoder->dev, dp->ptn_bridge);
 	if (ret) {
 		DRM_ERROR("Failed to attach bridge to drm\n");
 		return ret;
@@ -1020,14 +1020,15 @@ static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
 	return 0;
 }
 
-static int exynos_dp_create_connector(struct drm_encoder *encoder)
+static int exynos_dp_bridge_attach(struct drm_bridge *bridge)
 {
-	struct exynos_dp_device *dp = encoder_to_dp(encoder);
+	struct exynos_dp_device *dp = bridge->driver_private;
+	struct drm_encoder *encoder = &dp->encoder;
 	struct drm_connector *connector = &dp->connector;
 	int ret;
 
 	/* Pre-empt DP connector creation if there's a bridge */
-	if (dp->bridge) {
+	if (dp->ptn_bridge) {
 		ret = exynos_drm_attach_lcd_bridge(dp, encoder);
 		if (!ret)
 			return 0;
@@ -1052,22 +1053,9 @@ static int exynos_dp_create_connector(struct drm_encoder *encoder)
 	return ret;
 }
 
-static bool exynos_dp_mode_fixup(struct drm_encoder *encoder,
-				 const struct drm_display_mode *mode,
-				 struct drm_display_mode *adjusted_mode)
-{
-	return true;
-}
-
-static void exynos_dp_mode_set(struct drm_encoder *encoder,
-			       struct drm_display_mode *mode,
-			       struct drm_display_mode *adjusted_mode)
-{
-}
-
-static void exynos_dp_enable(struct drm_encoder *encoder)
+static void exynos_dp_bridge_enable(struct drm_bridge *bridge)
 {
-	struct exynos_dp_device *dp = encoder_to_dp(encoder);
+	struct exynos_dp_device *dp = bridge->driver_private;
 	struct exynos_drm_crtc *crtc = dp_to_crtc(dp);
 
 	if (dp->dpms_mode == DRM_MODE_DPMS_ON)
@@ -1092,9 +1080,9 @@ static void exynos_dp_enable(struct drm_encoder *encoder)
 	dp->dpms_mode = DRM_MODE_DPMS_ON;
 }
 
-static void exynos_dp_disable(struct drm_encoder *encoder)
+static void exynos_dp_bridge_disable(struct drm_bridge *bridge)
 {
-	struct exynos_dp_device *dp = encoder_to_dp(encoder);
+	struct exynos_dp_device *dp = bridge->driver_private;
 	struct exynos_drm_crtc *crtc = dp_to_crtc(dp);
 
 	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
@@ -1123,6 +1111,69 @@ static void exynos_dp_disable(struct drm_encoder *encoder)
 	dp->dpms_mode = DRM_MODE_DPMS_OFF;
 }
 
+static void exynos_dp_bridge_nop(struct drm_bridge *bridge)
+{
+	/* do nothing */
+}
+
+static const struct drm_bridge_funcs exynos_dp_bridge_funcs = {
+	.enable = exynos_dp_bridge_enable,
+	.disable = exynos_dp_bridge_disable,
+	.pre_enable = exynos_dp_bridge_nop,
+	.post_disable = exynos_dp_bridge_nop,
+	.attach = exynos_dp_bridge_attach,
+};
+
+static int exynos_dp_create_connector(struct drm_encoder *encoder)
+{
+	struct exynos_dp_device *dp = encoder_to_dp(encoder);
+	struct drm_device *drm_dev = dp->drm_dev;
+	struct drm_bridge *bridge;
+	int ret;
+
+	bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL);
+	if (!bridge) {
+		DRM_ERROR("failed to allocate for drm bridge\n");
+		return -ENOMEM;
+	}
+
+	dp->bridge = bridge;
+
+	encoder->bridge = bridge;
+	bridge->driver_private = dp;
+	bridge->encoder = encoder;
+	bridge->funcs = &exynos_dp_bridge_funcs;
+
+	ret = drm_bridge_attach(drm_dev, bridge);
+	if (ret) {
+		DRM_ERROR("failed to attach drm bridge\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static bool exynos_dp_mode_fixup(struct drm_encoder *encoder,
+				 const struct drm_display_mode *mode,
+				 struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static void exynos_dp_mode_set(struct drm_encoder *encoder,
+			       struct drm_display_mode *mode,
+			       struct drm_display_mode *adjusted_mode)
+{
+}
+
+static void exynos_dp_enable(struct drm_encoder *encoder)
+{
+}
+
+static void exynos_dp_disable(struct drm_encoder *encoder)
+{
+}
+
 static struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
 	.mode_fixup = exynos_dp_mode_fixup,
 	.mode_set = exynos_dp_mode_set,
@@ -1238,7 +1289,7 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 		}
 	}
 
-	if (!dp->panel && !dp->bridge) {
+	if (!dp->panel && !dp->ptn_bridge) {
 		ret = exynos_dp_dt_parse_panel(dp);
 		if (ret)
 			return ret;
@@ -1365,9 +1416,9 @@ static int exynos_dp_probe(struct platform_device *pdev)
 	if (endpoint) {
 		bridge_node = of_graph_get_remote_port_parent(endpoint);
 		if (bridge_node) {
-			dp->bridge = of_drm_find_bridge(bridge_node);
+			dp->ptn_bridge = of_drm_find_bridge(bridge_node);
 			of_node_put(bridge_node);
-			if (!dp->bridge)
+			if (!dp->ptn_bridge)
 				return -EPROBE_DEFER;
 		} else
 			return -EPROBE_DEFER;
diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.h b/drivers/gpu/drm/exynos/exynos_dp_core.h
index e413b6f..66eec4b 100644
--- a/drivers/gpu/drm/exynos/exynos_dp_core.h
+++ b/drivers/gpu/drm/exynos/exynos_dp_core.h
@@ -153,6 +153,7 @@ struct exynos_dp_device {
 	struct drm_connector	connector;
 	struct drm_panel	*panel;
 	struct drm_bridge	*bridge;
+	struct drm_bridge	*ptn_bridge;
 	struct clk		*clock;
 	unsigned int		irq;
 	void __iomem		*reg_base;
-- 
1.9.1