[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>
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 1d643b9..24137bc 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -3472,6 +3472,18 @@
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;
}