drm/imx: parallel-display: switch to drm_panel_bridge

Defer panel handling to drm_panel_bridge, unifying codepaths for the
panel and bridge cases.

Reviewed-by: Philipp Zabel <[email protected]>
Tested-by: Chris Healy <[email protected]>
Tested-by: Philipp Zabel <[email protected]> # on imx6q-nitrogen6x
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: lumag

drivers/gpu/drm/imx/ipuv3/Kconfig

@@ -11,8 +11,9 @@ config DRM_IMX
 
 config DRM_IMX_PARALLEL_DISPLAY
 	tristate "Support for parallel displays"
-	select DRM_PANEL
 	depends on DRM_IMX
+	select DRM_BRIDGE
+	select DRM_PANEL_BRIDGE
 	select VIDEOMODE_HELPERS
 
 config DRM_IMX_TVE

drivers/gpu/drm/imx/ipuv3/parallel-display.c

@@ -18,7 +18,6 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_managed.h>
 #include <drm/drm_of.h>
-#include <drm/drm_panel.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
 
@@ -36,7 +35,6 @@ struct imx_parallel_display {
 	u32 bus_format;
 	u32 bus_flags;
 	struct drm_display_mode mode;
-	struct drm_panel *panel;
 	struct drm_bridge *next_bridge;
 };
 
@@ -56,10 +54,6 @@ static int imx_pd_connector_get_modes(struct drm_connector *connector)
 	struct device_node *np = imxpd->dev->of_node;
 	int num_modes;
 
-	num_modes = drm_panel_get_modes(imxpd->panel, connector);
-	if (num_modes > 0)
-		return num_modes;
-
 	if (np) {
 		struct drm_display_mode *mode = drm_mode_create(connector->dev);
 		int ret;
@@ -84,22 +78,6 @@ static int imx_pd_connector_get_modes(struct drm_connector *connector)
 	return num_modes;
 }
 
-static void imx_pd_bridge_enable(struct drm_bridge *bridge)
-{
-	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
-
-	drm_panel_prepare(imxpd->panel);
-	drm_panel_enable(imxpd->panel);
-}
-
-static void imx_pd_bridge_disable(struct drm_bridge *bridge)
-{
-	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
-
-	drm_panel_disable(imxpd->panel);
-	drm_panel_unprepare(imxpd->panel);
-}
-
 static const u32 imx_pd_bus_fmts[] = {
 	MEDIA_BUS_FMT_RGB888_1X24,
 	MEDIA_BUS_FMT_BGR888_1X24,
@@ -237,8 +215,6 @@ static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 };
 
 static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
-	.enable = imx_pd_bridge_enable,
-	.disable = imx_pd_bridge_disable,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
@@ -315,10 +291,14 @@ static int imx_pd_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	/* port@1 is the output port */
-	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
-					  &imxpd->next_bridge);
-	if (ret && ret != -ENODEV)
-		return ret;
+	imxpd->next_bridge = devm_drm_of_get_bridge(dev, np, 1, 0);
+	if (IS_ERR(imxpd->next_bridge)) {
+		ret = PTR_ERR(imxpd->next_bridge);
+		if (ret != -ENODEV)
+			return ret;
+
+		imxpd->next_bridge = NULL;
+	}
 
 	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 	if (!ret) {