target/linux/bcm27xx/patches-5.15/950-0763-drm-panel-Add-prepare_upstream_first-flag-to-drm_pan.patch

   1 From b5a2faf6deb6e7accec2c121840a72bdf6e97b4c Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Wed, 23 Feb 2022 15:36:56 +0000
   4 Subject: [PATCH] drm/panel: Add prepare_upstream_first flag to
   5  drm_panel
   6
   7 Mapping to the drm_bridge flag pre_enable_upstream_first,
   8 add a new flag prepare_upstream_first to drm_panel to allow
   9 the panel driver to request that the upstream bridge should
  10 be pre_enabled before the panel prepare.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  13 ---
  14  drivers/gpu/drm/bridge/panel.c |  3 +++
  15  include/drm/drm_panel.h        | 10 ++++++++++
  16  2 files changed, 13 insertions(+)
  17
  18 --- a/drivers/gpu/drm/bridge/panel.c
  19 +++ b/drivers/gpu/drm/bridge/panel.c
  20 @@ -225,6 +225,9 @@ struct drm_bridge *drm_panel_bridge_add_
  21         panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
  22         panel_bridge->bridge.type = connector_type;
  23
  24 +       panel_bridge->bridge.pre_enable_upstream_first =
  25 +                                               panel->prepare_upstream_first;
  26 +
  27         drm_bridge_add(&panel_bridge->bridge);
  28
  29         return &panel_bridge->bridge;
  30 --- a/include/drm/drm_panel.h
  31 +++ b/include/drm/drm_panel.h
  32 @@ -179,6 +179,16 @@ struct drm_panel {
  33          * Panel entry in registry.
  34          */
  35         struct list_head list;
  36 +
  37 +       /**
  38 +        * @prepare_upstream_first:
  39 +        *
  40 +        * The upstream controller should be prepared first, before the prepare
  41 +        * for the panel is called. This is largely required for DSI panels
  42 +        * where the DSI host controller should be initialised to LP-11 before
  43 +        * the panel is powered up.
  44 +        */
  45 +       bool prepare_upstream_first;
  46  };
  47
  48  void drm_panel_init(struct drm_panel *panel, struct device *dev,