Mapping to the drm_bridge flag pre_enable_prev_first,
add a new flag prepare_prev_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 | 2 ++
include/drm/drm_panel.h | 10 ++++++++++
2 files changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 216af76d0042..03c3274dc3d9 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -364,6 +364,8 @@ struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev,
devres_free(ptr);
}
+ bridge->pre_enable_prev_first = panel->prepare_prev_first;
+
return bridge;
}
EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed);
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 994bfcdd84c5..432fab2347eb 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -188,6 +188,16 @@ struct drm_panel {
* Panel entry in registry.
*/
struct list_head list;
+
+ /**
+ * @prepare_prev_first:
+ *
+ * The previous 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_prev_first;
};
void drm_panel_init(struct drm_panel *panel, struct device *dev,
--
2.34.1
