[PATCH RFC v2 11/19] drm/bridge: fsl-ldb: don't create a panel_bridge

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

Now a panel_bridge is automatically created for every drm_panel, so this
code, looking only for a panel and unconditionally creating a panel_bridge
for it, would lead to creating a second bridge for the same panel.

Fix and simplify the code by just getting a reference to the
already-existing bridge from of_drm_find_and_get_bridge().

And since of_drm_find_and_get_bridge() returns a refcounted bridge, take
care of putting the bridge reference by using bridge->next_bridge.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/bridge/Kconfig   |  1 -
 drivers/gpu/drm/bridge/fsl-ldb.c | 19 +++++--------------
 2 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 30f71654eaeb..0a1e617b3007 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -87,7 +87,6 @@ config DRM_FSL_LDB
 	depends on OF
 	depends on ARCH_MXC || COMPILE_TEST
 	select DRM_KMS_HELPER
-	select DRM_PANEL_BRIDGE
 	help
 	  Support for i.MX8MP DPI-to-LVDS on-SoC encoder.
 
diff --git a/drivers/gpu/drm/bridge/fsl-ldb.c b/drivers/gpu/drm/bridge/fsl-ldb.c
index 26cc72948f31..7ec84c81cd78 100644
--- a/drivers/gpu/drm/bridge/fsl-ldb.c
+++ b/drivers/gpu/drm/bridge/fsl-ldb.c
@@ -15,7 +15,6 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_of.h>
-#include <drm/drm_panel.h>
 
 #define LDB_CTRL_CH0_ENABLE			BIT(0)
 #define LDB_CTRL_CH0_DI_SELECT			BIT(1)
@@ -86,7 +85,6 @@ static const struct fsl_ldb_devdata fsl_ldb_devdata[] = {
 struct fsl_ldb {
 	struct device *dev;
 	struct drm_bridge bridge;
-	struct drm_bridge *panel_bridge;
 	struct clk *clk;
 	struct regmap *regmap;
 	const struct fsl_ldb_devdata *devdata;
@@ -119,7 +117,7 @@ static int fsl_ldb_attach(struct drm_bridge *bridge,
 {
 	struct fsl_ldb *fsl_ldb = to_fsl_ldb(bridge);
 
-	return drm_bridge_attach(encoder, fsl_ldb->panel_bridge,
+	return drm_bridge_attach(encoder, fsl_ldb->bridge.next_bridge,
 				 bridge, flags);
 }
 
@@ -298,7 +296,6 @@ static int fsl_ldb_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *panel_node;
 	struct device_node *remote1, *remote2;
-	struct drm_panel *panel;
 	struct fsl_ldb *fsl_ldb;
 	int dual_link;
 
@@ -339,19 +336,13 @@ static int fsl_ldb_probe(struct platform_device *pdev)
 		fsl_ldb_is_dual(fsl_ldb) ? "dual-link mode" :
 		fsl_ldb->ch0_enabled ? "channel 0" : "channel 1");
 
-	panel = of_drm_find_panel(panel_node);
-	of_node_put(panel_node);
-	if (IS_ERR(panel))
-		return PTR_ERR(panel);
-
 	if (of_property_present(dev->of_node, "nxp,enable-termination-resistor"))
 		fsl_ldb->use_termination_resistor = true;
 
-	fsl_ldb->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
-	drm_panel_put(panel);
-	if (IS_ERR(fsl_ldb->panel_bridge))
-		return PTR_ERR(fsl_ldb->panel_bridge);
-
+	fsl_ldb->bridge.next_bridge = of_drm_find_and_get_bridge(panel_node);
+	of_node_put(panel_node);
+	if (!fsl_ldb->bridge.next_bridge)
+		return -ENODEV;
 
 	if (fsl_ldb_is_dual(fsl_ldb)) {
 		struct device_node *port1, *port2;

-- 
2.55.0