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| author | Takashi Iwai <tiwai@suse.de> | 2012-10-16 16:52:26 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2012-10-16 18:01:36 +0200 |
| commit | 1f04661fde9deda4a2cd5845258715a22d8af197 (patch) | |
| tree | e3bcc926854ac32e60f5de4461bab5272bf7a80b | |
| parent | 128960a9ad67e2d119738f5211956e0304517551 (diff) | |
| download | op-kernel-dev-1f04661fde9deda4a2cd5845258715a22d8af197.zip op-kernel-dev-1f04661fde9deda4a2cd5845258715a22d8af197.tar.gz | |
ALSA: hda - Stop LPIB delay counting on broken hardware
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>
| -rw-r--r-- | sound/pci/hda/hda_intel.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index ecf2775..72b085a 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -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); |
