From b5a2faf6deb6e7accec2c121840a72bdf6e97b4c Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Wed, 23 Feb 2022 15:36:56 +0000 Subject: [PATCH] drm/panel: Add prepare_upstream_first flag to drm_panel 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 --- drivers/gpu/drm/bridge/panel.c | 3 +++ include/drm/drm_panel.h | 10 ++++++++++ 2 files changed, 13 insertions(+) --- a/drivers/gpu/drm/bridge/panel.c +++ b/drivers/gpu/drm/bridge/panel.c @@ -226,6 +226,9 @@ struct drm_bridge *drm_panel_bridge_add_ 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; --- 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,