[ALSA] hda-intel - Automatic correction to single_cmd mode
Modules: HDA Codec driver,HDA Intel driver
Switch to single_cmd mode automatically as a fallback when CORB/RIRB
communication doesn't work well. It may make the driver working on
some devices with broken BIOS/ACPI support.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 208a334..0d1566a 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -531,6 +531,12 @@
bus->caddr_tbl[codec_addr] = codec;
codec->vendor_id = snd_hda_param_read(codec, AC_NODE_ROOT, AC_PAR_VENDOR_ID);
+ if (codec->vendor_id == -1)
+ /* read again, hopefully the access method was corrected
+ * in the last read...
+ */
+ codec->vendor_id = snd_hda_param_read(codec, AC_NODE_ROOT,
+ AC_PAR_VENDOR_ID);
codec->subsystem_id = snd_hda_param_read(codec, AC_NODE_ROOT, AC_PAR_SUBSYSTEM_ID);
codec->revision_id = snd_hda_param_read(codec, AC_NODE_ROOT, AC_PAR_REV_ID);