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, 51 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0442-drm-vc4-hdmi-Simplify-the-connector-state-retrieval.patch b/target/linux/bcm27xx/patches-5.15/950-0442-drm-vc4-hdmi-Simplify-the-connector-state-retrieval.patch
new file mode 100644
index 0000000000..b84a607ea0
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0442-drm-vc4-hdmi-Simplify-the-connector-state-retrieval.patch
@@ -0,0 +1,51 @@
+From fbd09981ff7ecefd9514325bdbfa2b4df4b4f017 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Wed, 27 Oct 2021 14:38:50 +0100
+Subject: [PATCH] drm/vc4: hdmi: Simplify the connector state retrieval
+
+When we have the entire DRM state, retrieving the connector state only
+requires the drm_connector pointer. Fortunately for us, we have
+allocated it as a part of the vc4_hdmi structure, so we can retrieve get
+a pointer by simply accessing our field in that structure.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/gpu/drm/vc4/vc4_hdmi.c | 21 +++------------------
+ 1 file changed, 3 insertions(+), 18 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
+@@ -1002,30 +1002,15 @@ static void vc4_hdmi_recenter_fifo(struc
+ 		  "VC4_HDMI_FIFO_CTL_RECENTER_DONE");
+ }
+ 
+-static struct drm_connector_state *
+-vc4_hdmi_encoder_get_connector_state(struct drm_encoder *encoder,
+-				     struct drm_atomic_state *state)
+-{
+-	struct drm_connector_state *conn_state;
+-	struct drm_connector *connector;
+-	unsigned int i;
+-
+-	for_each_new_connector_in_state(state, connector, conn_state, i) {
+-		if (conn_state->best_encoder == encoder)
+-			return conn_state;
+-	}
+-
+-	return NULL;
+-}
+-
+ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
+ 						struct drm_atomic_state *state)
+ {
++	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
++	struct drm_connector *connector = &vc4_hdmi->connector;
+ 	struct drm_connector_state *conn_state =
+-		vc4_hdmi_encoder_get_connector_state(encoder, state);
++		drm_atomic_get_new_connector_state(state, connector);
+ 	struct vc4_hdmi_connector_state *vc4_conn_state =
+ 		conn_state_to_vc4_hdmi_conn_state(conn_state);
+-	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
+ 	struct drm_display_mode *mode = &vc4_hdmi->saved_adjusted_mode;
+ 	unsigned long pixel_rate = vc4_conn_state->pixel_rate;
+ 	unsigned long bvb_rate, hsm_rate;