diff options
| author | Takashi Iwai <tiwai@suse.de> | 2008-01-16 18:09:47 +0300 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2008-01-31 19:30:02 +0300 |
| commit | 52987656fb3d43192639a7d585feb564c075c864 (patch) | |
| tree | e8ac0d6e33e537016710cb380f6678770f9773dc /sound | |
| parent | 192b8e3922c916cbacac7e5a190d9412ae39a7ee (diff) | |
| download | linux-52987656fb3d43192639a7d585feb564c075c864.tar.xz | |
[ALSA] hda-intel - Add workarounds for STAC codecs
Some machines with STAC codecs seem to have problems (e.g. no audible
playback) when the delay in codec-read routine is too short.
I still don't figure out which command sequence causes this problem
(due to lack of test hardware), but it's known that increasing the
delay fixes. So, added a stupid workaround here temporarily...
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/hda_codec.h | 3 | ||||
| -rw-r--r-- | sound/pci/hda/hda_intel.c | 8 | ||||
| -rw-r--r-- | sound/pci/hda/patch_sigmatel.c | 12 |
3 files changed, 21 insertions, 2 deletions
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h index 20be7761562d..719e46f6fb36 100644 --- a/sound/pci/hda/hda_codec.h +++ b/sound/pci/hda/hda_codec.h @@ -464,6 +464,9 @@ struct hda_bus { struct hda_bus_unsolicited *unsol; struct snd_info_entry *proc; + + /* misc op flags */ + unsigned int needs_damn_long_delay :1; }; /* diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 5f2c3ca863db..fe07bdff60d0 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -559,8 +559,12 @@ static unsigned int azx_rirb_get_response(struct hda_codec *codec) } if (!chip->rirb.cmds) return chip->rirb.res; /* the last value */ - udelay(10); - cond_resched(); + if (codec->bus->needs_damn_long_delay) + msleep(2); /* temporary workaround */ + else { + udelay(10); + cond_resched(); + } } while (time_after_eq(timeout, jiffies)); if (chip->msi) { diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c index 1d643b9771a0..24137bc975c4 100644 --- a/sound/pci/hda/patch_sigmatel.c +++ b/sound/pci/hda/patch_sigmatel.c @@ -3472,6 +3472,18 @@ static int patch_stac927x(struct hda_codec *codec) codec->patch_ops = stac92xx_patch_ops; + /* + * !!FIXME!! + * The STAC927x seem to require fairly long delays for certain + * command sequences. With too short delays (even if the answer + * is set to RIRB properly), it results in the silence output + * on some hardwares like Dell. + * + * The below flag enables the longer delay (see get_response + * in hda_intel.c). + */ + codec->bus->needs_damn_long_delay = 1; + return 0; } |