[alsa-devel] [PATCH] ASoC: Fail card instantiation if DAI format setup fails
If the DAI format setup fails, there is no valid communication format between CPU and CODEC, so fail card instantiation, rather than continue with a card that will most likely not function properly.
Signed-off-by: Ricard Wanderlof ricardw@axis.com ---
I've had the problem of a sound card coming up even though an incorrect DAI format was selected in the devicetree, apparently caused by not checking the return value of snd_soc_runtime_set_dai_fmt() when the card is instantiated, with the result in this particular case that that the audio data was not transferred correctly (capture data was shifted one bit up).
I'm unsure though if this is intentional, I can't think why it should be, since the DAI format is only set up at this time and not for instance later when a stream is enabled, but perhaps I'm missing something here.
At any rate, with this patch, the card does not come up under these circumstances. The error message from snd_soc_runtime_set_dai_fmt() is still printed to the kernel log so it's possible to see what the reason is.
/Ricard
sound/soc/soc-core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 7ecfe641ca46..06697b2d96b1 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -1511,8 +1511,11 @@ static int soc_probe_link_dais(struct snd_soc_card *card, } }
- if (dai_link->dai_fmt) - snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt); + if (dai_link->dai_fmt) { + ret = snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt); + if (ret) + return ret; + }
ret = soc_post_component_init(rtd, dai_link->name); if (ret)
The patch
ASoC: Fail card instantiation if DAI format setup fails
has been applied to the asoc tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.3
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying to this mail.
Thanks, Mark
From 40aa5383e393d72f6aa3943a4e7b1aae25a1e43b Mon Sep 17 00:00:00 2001
From: Ricard Wanderlof ricard.wanderlof@axis.com Date: Wed, 24 Jul 2019 11:38:44 +0200 Subject: [PATCH] ASoC: Fail card instantiation if DAI format setup fails
If the DAI format setup fails, there is no valid communication format between CPU and CODEC, so fail card instantiation, rather than continue with a card that will most likely not function properly.
Signed-off-by: Ricard Wanderlof ricardw@axis.com Link: https://lore.kernel.org/r/alpine.DEB.2.20.1907241132350.6338@lnxricardw1.se.... Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/soc-core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index c0a774d0a5ff..1486fb2eb921 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -1511,8 +1511,11 @@ static int soc_probe_link_dais(struct snd_soc_card *card, } }
- if (dai_link->dai_fmt) - snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt); + if (dai_link->dai_fmt) { + ret = snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt); + if (ret) + return ret; + }
ret = soc_post_component_init(rtd, dai_link->name); if (ret)
participants (2)
-
Mark Brown -
Ricard Wanderlof