bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0763-drm-panel-Add-prepare_upstream_first-flag-to-drm_pan.patch b/target/linux/bcm27xx/patches-5.15/950-0763-drm-panel-Add-prepare_upstream_first-flag-to-drm_pan.patch
new file mode 100644
index 0000000000..0633e6080e
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0763-drm-panel-Add-prepare_upstream_first-flag-to-drm_pan.patch
@@ -0,0 +1,48 @@
+From b5a2faf6deb6e7accec2c121840a72bdf6e97b4c Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+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 <dave.stevenson@raspberrypi.com>
+---
+ 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
+@@ -225,6 +225,9 @@ 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,