target/linux/bcm27xx/patches-6.1/950-0035-drm-panel-Add-prepare_upstream_first-flag-to-drm_pan.patch

   1 From 5ea6b17027810ffbdb5bea7d0a2b1d312dd1021c Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Mon, 5 Dec 2022 17:33:27 +0000
   4 Subject: [PATCH] drm/panel: Add prepare_prev_first flag to drm_panel
   5
   6 Mapping to the drm_bridge flag pre_enable_prev_first,
   7 add a new flag prepare_prev_first to drm_panel to allow
   8 the panel driver to request that the upstream bridge should
   9 be pre_enabled before the panel prepare.
  10
  11 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  12 Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
  13 Link: https://lore.kernel.org/r/20221205173328.1395350-6-dave.stevenson@raspberrypi.com
  14 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  15 ---
  16  drivers/gpu/drm/bridge/panel.c |  2 ++
  17  include/drm/drm_panel.h        | 10 ++++++++++
  18  2 files changed, 12 insertions(+)
  19
  20 --- a/drivers/gpu/drm/bridge/panel.c
  21 +++ b/drivers/gpu/drm/bridge/panel.c
  22 @@ -368,6 +368,8 @@ struct drm_bridge *devm_drm_panel_bridge
  23                 devres_free(ptr);
  24         }
  25
  26 +       bridge->pre_enable_prev_first = panel->prepare_prev_first;
  27 +
  28         return bridge;
  29  }
  30  EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed);
  31 --- a/include/drm/drm_panel.h
  32 +++ b/include/drm/drm_panel.h
  33 @@ -196,6 +196,16 @@ struct drm_panel {
  34          * Panel entry in registry.
  35          */
  36         struct list_head list;
  37 +
  38 +       /**
  39 +        * @prepare_prev_first:
  40 +        *
  41 +        * The previous controller should be prepared first, before the prepare
  42 +        * for the panel is called. This is largely required for DSI panels
  43 +        * where the DSI host controller should be initialised to LP-11 before
  44 +        * the panel is powered up.
  45 +        */
  46 +       bool prepare_prev_first;
  47  };
  48
  49  void drm_panel_init(struct drm_panel *panel, struct device *dev,