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

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>
This commit is contained in:
Takashi Iwai 2020-12-18 15:58:58 +01:00
parent f2283366c2
commit 9df28edce7
1 changed files with 6 additions and 0 deletions
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6
sound/usb/clock.c
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@ -534,6 +534,12 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip,
}
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;