bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0599-drm-vc4-Reset-audio-infoframe-on-encoder_enable-if-p.patch b/target/linux/bcm27xx/patches-5.4/950-0599-drm-vc4-Reset-audio-infoframe-on-encoder_enable-if-p.patch
new file mode 100644
index 0000000000..56106a4274
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0599-drm-vc4-Reset-audio-infoframe-on-encoder_enable-if-p.patch
@@ -0,0 +1,72 @@
+From 3e45488069e20b07b83d8cbba88c7fa2b205e559 Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Wed, 25 Mar 2020 18:01:04 +0000
+Subject: [PATCH] drm/vc4: Reset audio infoframe on encoder_enable if
+ previously streaming
+
+If the encoder is disabled and re-enabled (eg mode change) all infoframes
+are reset, whilst the audio subsystem know nothing about this change.
+The driver therefore needs to reinstate the audio infoframe for
+itself.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ drivers/gpu/drm/vc4/vc4_hdmi.c | 12 ++++++++++++
+ drivers/gpu/drm/vc4/vc4_hdmi.h |  2 ++
+ 2 files changed, 14 insertions(+)
+
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
+@@ -344,8 +344,16 @@ static void vc4_hdmi_set_audio_infoframe
+ 
+ static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
+ {
++	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
++
+ 	vc4_hdmi_set_avi_infoframe(encoder);
+ 	vc4_hdmi_set_spd_infoframe(encoder);
++	/*
++	 * If audio was streaming, then we need to reenabled the audio
++	 * infoframe here during encoder_enable.
++	 */
++	if (vc4_hdmi->audio.streaming)
++		vc4_hdmi_set_audio_infoframe(encoder);
+ }
+ 
+ static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
+@@ -825,6 +833,7 @@ static void vc4_hdmi_audio_reset(struct
+ 	struct device *dev = &vc4_hdmi->pdev->dev;
+ 	int ret;
+ 
++	vc4_hdmi->audio.streaming = false;
+ 	ret = vc4_hdmi_stop_packet(encoder, HDMI_INFOFRAME_TYPE_AUDIO);
+ 	if (ret)
+ 		dev_err(dev, "Failed to stop audio infoframe: %d\n", ret);
+@@ -928,6 +937,7 @@ static int vc4_hdmi_audio_trigger(struct
+ 	switch (cmd) {
+ 	case SNDRV_PCM_TRIGGER_START:
+ 		vc4_hdmi_set_audio_infoframe(encoder);
++		vc4_hdmi->audio.streaming = true;
+ 
+ 		if (vc4_hdmi->variant->phy_rng_enable)
+ 			vc4_hdmi->variant->phy_rng_enable(vc4_hdmi);
+@@ -946,6 +956,8 @@ static int vc4_hdmi_audio_trigger(struct
+ 		if (vc4_hdmi->variant->phy_rng_disable)
+ 			vc4_hdmi->variant->phy_rng_disable(vc4_hdmi);
+ 
++		vc4_hdmi->audio.streaming = false;
++
+ 		break;
+ 	default:
+ 		break;
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
+@@ -101,6 +101,8 @@ struct vc4_hdmi_audio {
+ 	int channels;
+ 	struct snd_dmaengine_dai_dma_data dma_data;
+ 	struct snd_pcm_substream *substream;
++
++	bool streaming;
+ };
+ 
+ /* General HDMI hardware state. */