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, 63 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0630-drm-vc4-hdmi-Move-clock-validation-to-its-own-functi.patch b/target/linux/bcm27xx/patches-5.15/950-0630-drm-vc4-hdmi-Move-clock-validation-to-its-own-functi.patch
new file mode 100644
index 0000000000..c3222e51a4
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0630-drm-vc4-hdmi-Move-clock-validation-to-its-own-functi.patch
@@ -0,0 +1,63 @@
+From ca4627ecd3f93cd28ba3ae75af44e28224989b6a Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Thu, 2 Dec 2021 16:58:17 +0100
+Subject: [PATCH] drm/vc4: hdmi: Move clock validation to its own
+ function
+
+Our code is doing the same clock rate validation in multiple instances.
+Let's create a helper to share the rate validation.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/gpu/drm/vc4/vc4_hdmi.c | 26 +++++++++++++++-----------
+ 1 file changed, 15 insertions(+), 11 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
+@@ -1250,6 +1250,19 @@ static void vc4_hdmi_encoder_atomic_mode
+ 	mutex_unlock(&vc4_hdmi->mutex);
+ }
+ 
++static enum drm_mode_status
++vc4_hdmi_encoder_clock_valid(const struct vc4_hdmi *vc4_hdmi,
++			     unsigned long long clock)
++{
++	if (clock > vc4_hdmi->variant->max_pixel_clock)
++		return MODE_CLOCK_HIGH;
++
++	if (vc4_hdmi->disable_4kp60 && clock > HDMI_14_MAX_TMDS_CLK)
++		return MODE_CLOCK_HIGH;
++
++	return MODE_OK;
++}
++
+ #define WIFI_2_4GHz_CH1_MIN_FREQ	2400000000ULL
+ #define WIFI_2_4GHz_CH1_MAX_FREQ	2422000000ULL
+ 
+@@ -1294,10 +1307,7 @@ static int vc4_hdmi_encoder_atomic_check
+ 	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+ 		pixel_rate = pixel_rate * 2;
+ 
+-	if (pixel_rate > vc4_hdmi->variant->max_pixel_clock)
+-		return -EINVAL;
+-
+-	if (vc4_hdmi->disable_4kp60 && (pixel_rate > HDMI_14_MAX_TMDS_CLK))
++	if (vc4_hdmi_encoder_clock_valid(vc4_hdmi, pixel_rate) != MODE_OK)
+ 		return -EINVAL;
+ 
+ 	vc4_state->pixel_rate = pixel_rate;
+@@ -1317,13 +1327,7 @@ vc4_hdmi_encoder_mode_valid(struct drm_e
+ 	     (mode->hsync_end % 2) || (mode->htotal % 2)))
+ 		return MODE_H_ILLEGAL;
+ 
+-	if ((mode->clock * 1000) > vc4_hdmi->variant->max_pixel_clock)
+-		return MODE_CLOCK_HIGH;
+-
+-	if (vc4_hdmi->disable_4kp60 && vc4_hdmi_mode_needs_scrambling(mode))
+-		return MODE_CLOCK_HIGH;
+-
+-	return MODE_OK;
++	return vc4_hdmi_encoder_clock_valid(vc4_hdmi, mode->clock * 1000);
+ }
+ 
+ static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {