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, 43 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0624-drm-vc4-hdmi-Add-full-range-RGB-helper.patch b/target/linux/bcm27xx/patches-5.15/950-0624-drm-vc4-hdmi-Add-full-range-RGB-helper.patch
new file mode 100644
index 0000000000..5f606d39b2
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0624-drm-vc4-hdmi-Add-full-range-RGB-helper.patch
@@ -0,0 +1,43 @@
+From 4809cf80fdd964c413045e550fb137a18dc98ba2 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Tue, 12 Jan 2021 15:55:07 +0100
+Subject: [PATCH] drm/vc4: hdmi: Add full range RGB helper
+
+We're going to need to tell whether we want to run with a full or
+limited range RGB output in multiple places in the code, so let's create
+a helper that will return whether we need with full range or not.
+
+Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/gpu/drm/vc4/vc4_hdmi.c | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
+@@ -107,6 +107,15 @@ static bool vc4_hdmi_mode_needs_scrambli
+ 	return (mode->clock * 1000) > HDMI_14_MAX_TMDS_CLK;
+ }
+ 
++static bool vc4_hdmi_is_full_range_rgb(struct vc4_hdmi *vc4_hdmi,
++				       const struct drm_display_mode *mode)
++{
++	struct vc4_hdmi_encoder *vc4_encoder = &vc4_hdmi->encoder;
++
++	return !vc4_encoder->hdmi_monitor ||
++		drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_FULL;
++}
++
+ static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
+ {
+ 	struct drm_info_node *node = (struct drm_info_node *)m->private;
+@@ -1115,8 +1124,7 @@ static void vc4_hdmi_encoder_pre_crtc_en
+ 
+ 	mutex_lock(&vc4_hdmi->mutex);
+ 
+-	if (vc4_encoder->hdmi_monitor &&
+-	    drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_LIMITED) {
++	if (!vc4_hdmi_is_full_range_rgb(vc4_hdmi, mode)) {
+ 		if (vc4_hdmi->variant->csc_setup)
+ 			vc4_hdmi->variant->csc_setup(vc4_hdmi, true);
+