linux-kernel - [PATCH] ASoC: Change handling of unimplemented set_bclk

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Message-Id: <20220818165336.76403-1-povik+lin@cutebit.org>
Date:   Thu, 18 Aug 2022 18:53:36 +0200
From:   Martin Povišer <povik+lin@...ebit.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Martin Povišer <povik+lin@...ebit.org>
Subject: [PATCH] ASoC: Change handling of unimplemented set_bclk_ratio

If a 'set_bclk_ratio' call is attempted on a DAI not implementing the
method, make it an -ENOSUPP error instead of -EINVAL. Assume the DAI can
still be okay with the ratio, just does not care to register a handler.

No current in-tree users of snd_soc_dai_set_bclk_ratio seem to inspect
the return value, but -ENOSUPP disables an error print from within the
common soc_dai_ret return filter. With the new behavior a machine
driver can do a blanket 'set_bclk_ratio' on all DAIs on a bus, some of
which may care about the ratio, some of which may not.

Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
---
 sound/soc/soc-dai.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/soc-dai.c b/sound/soc/soc-dai.c
index d530e8c2b77b..49752af0e205 100644
--- a/sound/soc/soc-dai.c
+++ b/sound/soc/soc-dai.c
@@ -124,7 +124,7 @@ EXPORT_SYMBOL_GPL(snd_soc_dai_set_pll);
  */
 int snd_soc_dai_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
 {
-	int ret = -EINVAL;
+	int ret = -ENOTSUPP;

 	if (dai->driver->ops &&
 	    dai->driver->ops->set_bclk_ratio)
-- 
2.33.0