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| author | Takashi Iwai <tiwai@suse.de> | 2007-02-01 15:46:50 +0100 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2007-02-09 09:03:32 +0100 |
| commit | 3372a153c230bd0b28d470118d5a4c5840f8f966 (patch) | |
| tree | f705d4b3bfd3527876d8895877d84e1ddb37b6fb /sound | |
| parent | 0981a260a1fe4a3f22cc70ef01ce38a73f548745 (diff) | |
| download | lwn-3372a153c230bd0b28d470118d5a4c5840f8f966.tar.gz lwn-3372a153c230bd0b28d470118d5a4c5840f8f966.zip | |
[ALSA] hda-intel - Add black/whitelist for position_fix option
Some devices are known to require position_fix=1 or 2 to make the
driver working correctly. Otherwise the sound gets weird effects,
such as stutters.
Now a black/whitelist is introduced to indicate the position_fix
value explicitly for such misbehaving hardwares. As a first example,
Dell D820 is listed there. More will come later likely...
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/hda_intel.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 83d1ba7f33a0..b9a8e238b0a8 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -1503,6 +1503,31 @@ static int azx_dev_free(struct snd_device *device) } /* + * white/black-listing for position_fix + */ +static const struct snd_pci_quirk position_fix_list[] __devinitdata = { + SND_PCI_QUIRK(0x1028, 0x01cc, "Dell D820", POS_FIX_NONE), + {} +}; + +static int __devinit check_position_fix(struct azx *chip, int fix) +{ + const struct snd_pci_quirk *q; + + if (fix == POS_FIX_AUTO) { + q = snd_pci_quirk_lookup(chip->pci, position_fix_list); + if (q) { + snd_printdd(KERN_INFO + "hda_intel: position_fix set to %d " + "for device %04x:%04x\n", + q->value, q->subvendor, q->subdevice); + return q->value; + } + } + return fix; +} + +/* * constructor */ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci, @@ -1536,7 +1561,8 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci, chip->driver_type = driver_type; chip->msi = enable_msi; - chip->position_fix = position_fix; + chip->position_fix = check_position_fix(chip, position_fix); + chip->single_cmd = single_cmd; #if BITS_PER_LONG != 64 |