[PATCH v3 04/21] drm/bridge: tc358764: add drm_panel_bridge support

[Sam Ravnborg]

Prepare the bridge driver for use in a chained setup by
replacing direct use of drm_panel with drm_panel_bridge support.

The bridge panel will use the connector type reported by the panel,
where the connector for this driver hardcode DRM_MODE_CONNECTOR_LVDS.

v2:
  - Use PTR_ERR_OR_ZERO() (kbuild test robot)

Signed-off-by: Sam Ravnborg <sam at ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Cc: kbuild test robot <lkp at intel.com>
Cc: Andrzej Hajda <a.hajda at samsung.com>
Cc: Neil Armstrong <narmstrong at baylibre.com>
Cc: Laurent Pinchart <Laurent.pinchart at ideasonboard.com>
Cc: Jonas Karlman <jonas at kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec at siol.net>
---
 drivers/gpu/drm/bridge/tc358764.c | 57 ++++++++-----------------------
 1 file changed, 14 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358764.c b/drivers/gpu/drm/bridge/tc358764.c
index a277739fab58..e1f052a4f53b 100644
--- a/drivers/gpu/drm/bridge/tc358764.c
+++ b/drivers/gpu/drm/bridge/tc358764.c
@@ -156,7 +156,7 @@ struct tc358764 {
 	struct drm_connector connector;
 	struct regulator_bulk_data supplies[ARRAY_SIZE(tc358764_supplies)];
 	struct gpio_desc *gpio_reset;
-	struct drm_panel *panel;
+	struct drm_bridge *panel_bridge;
 	int error;
 };
 
@@ -282,7 +282,7 @@ static int tc358764_get_modes(struct drm_connector *connector)
 {
 	struct tc358764 *ctx = connector_to_tc358764(connector);
 
-	return drm_panel_get_modes(ctx->panel, connector);
+	return drm_bridge_get_modes(ctx->panel_bridge, connector);
 }
 
 static const
@@ -298,23 +298,11 @@ static const struct drm_connector_funcs tc358764_connector_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
-static void tc358764_disable(struct drm_bridge *bridge)
-{
-	struct tc358764 *ctx = bridge_to_tc358764(bridge);
-	int ret = drm_panel_disable(bridge_to_tc358764(bridge)->panel);
-
-	if (ret < 0)
-		dev_err(ctx->dev, "error disabling panel (%d)\n", ret);
-}
-
 static void tc358764_post_disable(struct drm_bridge *bridge)
 {
 	struct tc358764 *ctx = bridge_to_tc358764(bridge);
 	int ret;
 
-	ret = drm_panel_unprepare(ctx->panel);
-	if (ret < 0)
-		dev_err(ctx->dev, "error unpreparing panel (%d)\n", ret);
 	tc358764_reset(ctx);
 	usleep_range(10000, 15000);
 	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
@@ -335,18 +323,6 @@ static void tc358764_pre_enable(struct drm_bridge *bridge)
 	ret = tc358764_init(ctx);
 	if (ret < 0)
 		dev_err(ctx->dev, "error initializing bridge (%d)\n", ret);
-	ret = drm_panel_prepare(ctx->panel);
-	if (ret < 0)
-		dev_err(ctx->dev, "error preparing panel (%d)\n", ret);
-}
-
-static void tc358764_enable(struct drm_bridge *bridge)
-{
-	struct tc358764 *ctx = bridge_to_tc358764(bridge);
-	int ret = drm_panel_enable(ctx->panel);
-
-	if (ret < 0)
-		dev_err(ctx->dev, "error enabling panel (%d)\n", ret);
 }
 
 static int tc358764_attach(struct drm_bridge *bridge,
@@ -356,6 +332,11 @@ static int tc358764_attach(struct drm_bridge *bridge,
 	struct drm_device *drm = bridge->dev;
 	int ret;
 
+	ret = drm_bridge_attach(bridge->encoder, ctx->panel_bridge,
+				bridge, flags);
+	if (ret < 0)
+		return ret;
+
 	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
 		DRM_ERROR("Fix bridge driver to make connector optional!");
 		return -EINVAL;
@@ -373,32 +354,21 @@ static int tc358764_attach(struct drm_bridge *bridge,
 	drm_connector_helper_add(&ctx->connector,
 				 &tc358764_connector_helper_funcs);
 	drm_connector_attach_encoder(&ctx->connector, bridge->encoder);
-	drm_panel_attach(ctx->panel, &ctx->connector);
 	ctx->connector.funcs->reset(&ctx->connector);
 
 	return 0;
 }
 
-static void tc358764_detach(struct drm_bridge *bridge)
-{
-	struct tc358764 *ctx = bridge_to_tc358764(bridge);
-
-	drm_panel_detach(ctx->panel);
-	ctx->panel = NULL;
-}
-
 static const struct drm_bridge_funcs tc358764_bridge_funcs = {
-	.disable = tc358764_disable,
 	.post_disable = tc358764_post_disable,
-	.enable = tc358764_enable,
 	.pre_enable = tc358764_pre_enable,
 	.attach = tc358764_attach,
-	.detach = tc358764_detach,
 };
 
 static int tc358764_parse_dt(struct tc358764 *ctx)
 {
 	struct device *dev = ctx->dev;
+	struct drm_panel *panel;
 	int ret;
 
 	ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
@@ -407,12 +377,13 @@ static int tc358764_parse_dt(struct tc358764 *ctx)
 		return PTR_ERR(ctx->gpio_reset);
 	}
 
-	ret = drm_of_find_panel_or_bridge(ctx->dev->of_node, 1, 0, &ctx->panel,
-					  NULL);
-	if (ret && ret != -EPROBE_DEFER)
-		dev_err(dev, "cannot find panel (%d)\n", ret);
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
+	if (ret)
+		return ret;
 
-	return ret;
+	ctx->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
+
+	return PTR_ERR_OR_ZERO(ctx->panel_bridge);
 }
 
 static int tc358764_configure_regulators(struct tc358764 *ctx)
-- 
2.25.1