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ALSA: usb-audio: Disable sample read check if firmware doesn't give back

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commit 9df28edce7c6ab38050235f6f8b43dd7ccd01b6d upstream.

Some buggy firmware don't give the current sample rate but leaves
zero.  Handle this case more gracefully without warning but just skip
the current rate verification from the next time.

Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20201218145858.2357-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2020-12-18 15:58:58 +01:00 committed by Greg Kroah-Hartman
parent 92549c90ed
commit de8f8a38f2
1 changed files with 6 additions and 0 deletions
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6
sound/usb/clock.c
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@ -531,6 +531,12 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
}
crate = data[0] | (data[1] << 8) | (data[2] << 16);
if (!crate) {
dev_info(&dev->dev, "failed to read current rate; disabling the check\n");
chip->sample_rate_read_error = 3; /* three strikes, see above */
return 0;
}
if (crate != rate) {
dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate);
// runtime->rate = crate;