On 04/03/2022 18:17, Dave Stevenson wrote:
Mapping to the drm_bridge flag pre_enable_upstream_first,
add a new flag prepare_upstream_first to drm_panel to allow
the panel driver to request that the upstream bridge should
be pre_enabled before the panel prepare.
Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
drivers/gpu/drm/bridge/panel.c | 3 +++
include/drm/drm_panel.h | 10 ++++++++++
2 files changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 5be057575183..2ea08b3ba326 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -234,6 +234,9 @@ struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
panel_bridge->bridge.type = connector_type;
+ panel_bridge->bridge.pre_enable_upstream_first =
+ panel->prepare_upstream_first;
+
drm_bridge_add(&panel_bridge->bridge);
return &panel_bridge->bridge;
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 1ba2d424a53f..c0f39dfbd071 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -179,6 +179,16 @@ struct drm_panel {
* Panel entry in registry.
*/
struct list_head list;
+
+ /**
+ * @prepare_upstream_first:
+ *
+ * The upstream controller should be prepared first, before the prepare
+ * for the panel is called. This is largely required for DSI panels
+ * where the DSI host controller should be initialised to LP-11 before
+ * the panel is powered up.
+ */
+ bool prepare_upstream_first;
};
void drm_panel_init(struct drm_panel *panel, struct device *dev,
--
With best wishes
Dmitry
