openwrt/target/linux/bcm27xx/patches-6.6/950-0578-drm-vc4-hdmi-Enable-the-audio-clock.patch

From 65ac92600898d2508375e3b68103aa3b056dfcdd Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Wed, 29 Mar 2023 15:26:52 +0100
Subject: [PATCH 0578/1085] drm/vc4: hdmi: Enable the audio clock

The audio clock is used by the HDMI controller driver and we were using
it to get its audio rate and compute the dividers needed to reach a
given audio sample rate.

However, we were never enabling it, which was resulting in lockups on
the BCM2712.

Fixes: 632ee3aa8786 ("drm/vc4: hdmi: Add audio-related callbacks")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -3589,6 +3589,7 @@ static int vc4_hdmi_runtime_suspend(stru
 {
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
 
+	clk_disable_unprepare(vc4_hdmi->audio_clock);
 	clk_disable_unprepare(vc4_hdmi->hsm_clock);
 
 	return 0;
@@ -3621,6 +3622,10 @@ static int vc4_hdmi_runtime_resume(struc
 		goto err_disable_clk;
 	}
 
+	ret = clk_prepare_enable(vc4_hdmi->audio_clock);
+	if (ret)
+		goto err_disable_clk;
+
 	if (vc4_hdmi->variant->reset)
 		vc4_hdmi->variant->reset(vc4_hdmi);