From 5ea6b17027810ffbdb5bea7d0a2b1d312dd1021c Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Mon, 5 Dec 2022 17:33:27 +0000 Subject: [PATCH] drm/panel: Add prepare_prev_first flag to drm_panel 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 Reviewed-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20221205173328.1395350-6-dave.stevenson@raspberrypi.com Signed-off-by: Maxime Ripard --- drivers/gpu/drm/bridge/panel.c | 2 ++ include/drm/drm_panel.h | 10 ++++++++++ 2 files changed, 12 insertions(+) --- a/drivers/gpu/drm/bridge/panel.c +++ b/drivers/gpu/drm/bridge/panel.c @@ -368,6 +368,8 @@ struct drm_bridge *devm_drm_panel_bridge devres_free(ptr); } + bridge->pre_enable_prev_first = panel->prepare_prev_first; + return bridge; } EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed); --- a/include/drm/drm_panel.h +++ b/include/drm/drm_panel.h @@ -196,6 +196,16 @@ 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,