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authorTakashi Iwai <tiwai@suse.de>2008-01-16 16:09:47 +0100
committerJaroslav Kysela <perex@perex.cz>2008-01-31 17:30:02 +0100
commit52987656fb3d43192639a7d585feb564c075c864 (patch)
treee8ac0d6e33e537016710cb380f6678770f9773dc /sound/pci
parent192b8e3922c916cbacac7e5a190d9412ae39a7ee (diff)
[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/pci')
-rw-r--r--sound/pci/hda/hda_codec.h3
-rw-r--r--sound/pci/hda/hda_intel.c8
-rw-r--r--sound/pci/hda/patch_sigmatel.c12
3 files changed, 21 insertions, 2 deletions
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 20be7761562..719e46f6fb3 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 5f2c3ca863d..fe07bdff60d 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 1d643b9771a..24137bc975c 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;
}