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openmptcprouter/6.6/target/linux/bcm27xx/patches-6.6/0029-vc4_hdmi-Avoid-log-spam-for-audio-start-failure.patch
Ycarus (Yannick Chabanois) 12de1d2995 Add RPI kernel 6.6 support
2024-04-05 20:55:33 +02:00

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From 7508b889b8c8058e53ceeec90a1e3cc998897e16 Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Tue, 6 Dec 2022 15:05:56 +0000
Subject: [PATCH 0029/1002] vc4_hdmi: Avoid log spam for audio start failure
We regularly get dmesg error reports of:
[ 18.184066] hdmi-audio-codec hdmi-audio-codec.3.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[ 18.184098] MAI: soc_pcm_open() failed (-19)
Currently I get 30 of these when booting to desktop.
We always say, ignore they are harmless, but removing them would be good.
A bit of investigation shows, for me, the errors are all generated by second, unused hdmi interface.
It shows as an alsa device, and pulseaudio attempts to open it (numerous times), generating a kernel
error message each time.
systemctl --user restart pulseaudio.service generates 6 additional error messages.
The error messages all come through:
https://github.com/raspberrypi/linux/blob/a009a9c0d79dfec114ee5102ec3d3325a172c952/sound/soc/soc-pcm.c#L39
which suggests returning ENOTSUPP, rather that ENODEV will be quiet. And indeed it is.
Note: earlier kernels do not have the quiet ENOTSUPP, so additional cherry-picks will be needed to backport
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 4bfd2880d31b..350174233a16 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -2394,7 +2394,7 @@ static int vc4_hdmi_audio_startup(struct device *dev, void *data)
}
if (!vc4_hdmi_audio_can_stream(vc4_hdmi)) {
- ret = -ENODEV;
+ ret = -ENOTSUPP;
goto out_dev_exit;
}
--
2.44.0