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ASoC: rockchip: i2s-tdm: Fix refcount test

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During development of V5 of the i2s-tdm patch series, I replaced
the atomic refcount with a regular integer, as it was only ever
accessed within a spinlock.

Foolishly, I got the semantics of atomic_dec_and_test wrong, which
resulted in a test for 0 actually becoming a test for >0.

The result was that setting the audio frequency broke; switching
from 44100 Hz audio playback to 96000 Hz audio playback would
garble the sound most unpleasantly.

Fix this by checking for --refcount == 0, which is what it should
have been all along.

Fixes: 081068fd6414 ("ASoC: rockchip: add support for i2s-tdm controller")
Signed-off-by: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
Link: https://lore.kernel.org/r/20211015210730.308946-1-frattaroli.nicolas@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Nicolas Frattaroli 2021-10-15 23:07:29 +02:00 committed by Mark Brown
parent bc387887ae
commit 0ea15e98cf
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
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2
sound/soc/rockchip/rockchip_i2s_tdm.c
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@ -357,7 +357,7 @@ static void rockchip_snd_txrxctrl(struct snd_pcm_substream *substream,
else
rockchip_disable_rde(i2s_tdm->regmap);
if (--i2s_tdm->refcount) {
if (--i2s_tdm->refcount == 0) {
rockchip_snd_xfer_clear(i2s_tdm,
I2S_CLR_TXC | I2S_CLR_RXC);
}