openwrt/target/linux/bcm27xx/patches-5.15/950-0622-drm-vc4-Skip-writes-to-disabled-packet-RAM.patch

From f0206374000464f8284826d3bdc50b2fc7c5ea71 Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Fri, 10 Dec 2021 18:03:18 +0000
Subject: [PATCH] drm/vc4: Skip writes to disabled packet RAM

This path actually occurs when audio is started during a hdmi mode set.
As the data will be written by vc4_hdmi_set_infoframes when packet RAM
is enabled again, don't treat as an error

Signed-off-by: Dom Cobley <popcornmix@gmail.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 5 ++++-
 drivers/gpu/drm/vc4/vc4_hdmi.h | 6 ++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -684,6 +684,7 @@ static void vc4_hdmi_encoder_post_crtc_d
 
 	mutex_lock(&vc4_hdmi->mutex);
 
+	vc4_hdmi->output_enabled = false;
 	spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);
 
 	HDMI_WRITE(HDMI_RAM_PACKET_CONFIG, 0);
@@ -1200,6 +1201,7 @@ static void vc4_hdmi_encoder_post_crtc_e
 			   VC4_HDMI_RAM_PACKET_ENABLE);
 
 		spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
+		vc4_hdmi->output_enabled = true;
 
 		vc4_hdmi_set_infoframes(encoder);
 	}
@@ -1605,7 +1607,8 @@ static int vc4_hdmi_audio_prepare(struct
 	spin_unlock_irqrestore(&vc4_hdmi->hw_lock, flags);
 
 	memcpy(&vc4_hdmi->audio.infoframe, &params->cea, sizeof(params->cea));
-	vc4_hdmi_set_audio_infoframe(encoder);
+	if (vc4_hdmi->output_enabled)
+		vc4_hdmi_set_audio_infoframe(encoder);
 
 	mutex_unlock(&vc4_hdmi->mutex);
 
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -209,6 +209,12 @@ struct vc4_hdmi {
 	struct drm_display_mode saved_adjusted_mode;
 
 	/**
+	 * @output_enabled: Is the HDMI controller currently active?
+	 * Protected by @mutex.
+	 */
+	bool output_enabled;
+
+	/**
 	 * @scdc_enabled: Is the HDMI controller currently running with
 	 * the scrambler on? Protected by @mutex.
 	 */