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-5.15/950-0903-drm-vc4-plane-Register-a-different-drm_plane_helper_.patch b/target/linux/bcm27xx/patches-5.15/950-0903-drm-vc4-plane-Register-a-different-drm_plane_helper_.patch
new file mode 100644
index 0000000000..c861170b42
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0903-drm-vc4-plane-Register-a-different-drm_plane_helper_.patch
@@ -0,0 +1,48 @@
+From 597258e5effb6ab56a116823e8cb88ccc578ec06 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Thu, 21 Apr 2022 11:39:27 +0200
+Subject: [PATCH] drm/vc4: plane: Register a different
+ drm_plane_helper_funcs on BCM2711
+
+On the BCM2711, our current definition of drm_plane_helper_funcs uses
+the custom vc4_prepare_fb() and vc4_cleanup_fb().
+
+Those functions rely on the buffer allocation path that was relying on
+the GPU, and is no longer relevant.
+
+Let's create another drm_plane_helper_funcs structure that we will
+register on the BCM2711.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/gpu/drm/vc4/vc4_plane.c | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_plane.c
++++ b/drivers/gpu/drm/vc4/vc4_plane.c
+@@ -1502,6 +1502,13 @@ static const struct drm_plane_helper_fun
+ 	.atomic_async_update = vc4_plane_atomic_async_update,
+ };
+ 
++static const struct drm_plane_helper_funcs vc5_plane_helper_funcs = {
++	.atomic_check = vc4_plane_atomic_check,
++	.atomic_update = vc4_plane_atomic_update,
++	.atomic_async_check = vc4_plane_atomic_async_check,
++	.atomic_async_update = vc4_plane_atomic_async_update,
++};
++
+ static bool vc4_format_mod_supported(struct drm_plane *plane,
+ 				     uint32_t format,
+ 				     uint64_t modifier)
+@@ -1606,7 +1613,10 @@ struct drm_plane *vc4_plane_init(struct
+ 	if (ret)
+ 		return ERR_PTR(ret);
+ 
+-	drm_plane_helper_add(plane, &vc4_plane_helper_funcs);
++	if (vc4->is_vc5)
++		drm_plane_helper_add(plane, &vc5_plane_helper_funcs);
++	else
++		drm_plane_helper_add(plane, &vc4_plane_helper_funcs);
+ 
+ 	drm_plane_create_alpha_property(plane);
+ 	drm_plane_create_blend_mode_property(plane,