[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>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 208a3341ec20..0d1566a39965 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -531,6 +531,12 @@ int snd_hda_codec_new(struct hda_bus *bus, unsigned int codec_addr,
         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);