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, 85 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0451-drm-vc4-Refactor-mode-checking-logic.patch b/target/linux/bcm27xx/patches-5.15/950-0451-drm-vc4-Refactor-mode-checking-logic.patch
new file mode 100644
index 0000000000..b41d088ad1
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0451-drm-vc4-Refactor-mode-checking-logic.patch
@@ -0,0 +1,85 @@
+From cf8fe4bd58be368fc600fab4ea5aed2dd5dba138 Mon Sep 17 00:00:00 2001
+From: Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>
+Date: Thu, 15 Jul 2021 01:08:05 +0200
+Subject: [PATCH] drm/vc4: Refactor mode checking logic
+
+Replace drm_encoder_helper_funcs::atomic_check with
+drm_connector_helper_funcs::atomic_check - the former is not called
+during drm_mode_obj_set_property_ioctl(). Set crtc_state->mode_changed
+if TV norm changes even without explicit mode change. This makes things
+like "xrandr --output Composite-1 --set mode PAL-M" work properly.
+
+Signed-off-by: Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>
+---
+ drivers/gpu/drm/vc4/vc4_vec.c | 42 ++++++++++++++++++++++-------------
+ 1 file changed, 26 insertions(+), 16 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_vec.c
++++ b/drivers/gpu/drm/vc4/vc4_vec.c
+@@ -415,6 +415,31 @@ static void vc4_vec_connector_reset(stru
+ 		connector->state->tv.mode = vc4_vec_get_default_mode(connector);
+ }
+ 
++static int vc4_vec_connector_atomic_check(struct drm_connector *conn,
++					  struct drm_atomic_state *state)
++{
++	struct drm_connector_state *old_state =
++		drm_atomic_get_old_connector_state(state, conn);
++	struct drm_connector_state *new_state =
++		drm_atomic_get_new_connector_state(state, conn);
++
++	const struct vc4_vec_tv_mode *vec_mode =
++		&vc4_vec_tv_modes[new_state->tv.mode];
++
++	if (new_state->crtc) {
++		struct drm_crtc_state *crtc_state =
++			drm_atomic_get_new_crtc_state(state, new_state->crtc);
++
++		if (!drm_mode_equal(vec_mode->mode, &crtc_state->mode))
++			return -EINVAL;
++
++		if (old_state->tv.mode != new_state->tv.mode)
++			crtc_state->mode_changed = true;
++	}
++
++	return 0;
++}
++
+ static const struct drm_connector_funcs vc4_vec_connector_funcs = {
+ 	.detect = vc4_vec_connector_detect,
+ 	.fill_modes = drm_helper_probe_single_connector_modes,
+@@ -426,6 +451,7 @@ static const struct drm_connector_funcs
+ 
+ static const struct drm_connector_helper_funcs vc4_vec_connector_helper_funcs = {
+ 	.get_modes = vc4_vec_connector_get_modes,
++	.atomic_check = vc4_vec_connector_atomic_check,
+ };
+ 
+ static struct drm_connector *vc4_vec_connector_init(struct drm_device *dev,
+@@ -563,26 +589,10 @@ static bool vc4_vec_encoder_mode_fixup(s
+ 	return true;
+ }
+ 
+-static int vc4_vec_encoder_atomic_check(struct drm_encoder *encoder,
+-					struct drm_crtc_state *crtc_state,
+-					struct drm_connector_state *conn_state)
+-{
+-	const struct vc4_vec_tv_mode *vec_mode;
+-
+-	vec_mode = &vc4_vec_tv_modes[conn_state->tv.mode];
+-
+-	if (conn_state->crtc &&
+-	    !drm_mode_equal(vec_mode->mode, &crtc_state->adjusted_mode))
+-		return -EINVAL;
+-
+-	return 0;
+-}
+-
+ static const struct drm_encoder_helper_funcs vc4_vec_encoder_helper_funcs = {
+ 	.disable = vc4_vec_encoder_disable,
+ 	.enable = vc4_vec_encoder_enable,
+ 	.mode_fixup = vc4_vec_encoder_mode_fixup,
+-	.atomic_check = vc4_vec_encoder_atomic_check,
+ };
+ 
+ static const struct vc4_vec_variant bcm2835_vec_variant = {