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ALSA: hda - Stop LPIB delay counting on broken hardware

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If LPIB reports a pretty bad value, we can't trust such hardware for
calculating the PCM delay.  Automatically turn off the delay counting
when such a problem is encountered.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=48911

Cc: <stable@vger.kernel.org> [v3.6]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-10-16 16:52:26 +02:00
parent 128960a9ad
commit 1f04661fde
1 changed files with 6 additions and 3 deletions
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9
sound/pci/hda/hda_intel.c
View file

@ -2158,9 +2158,12 @@ static unsigned int azx_get_position(struct azx *chip,
if (delay < 0)
delay += azx_dev->bufsize;
if (delay >= azx_dev->period_bytes) {
snd_printdd("delay %d > period_bytes %d\n",
delay, azx_dev->period_bytes);
delay = 0; /* something is wrong */
snd_printk(KERN_WARNING SFX
"Unstable LPIB (%d >= %d); "
"disabling LPIB delay counting\n",
delay, azx_dev->period_bytes);
delay = 0;
chip->driver_caps &= ~AZX_DCAPS_COUNT_LPIB_DELAY;
}
azx_dev->substream->runtime->delay =
bytes_to_frames(azx_dev->substream->runtime, delay);