[ALSA] hda: STAC927x analog mic

Some laptops have a internal analog microphone that is not setup by the BIOS.
Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_sigmatel.c

@@ -3721,6 +3721,8 @@ static int patch_stac927x(struct hda_codec *codec)
 		spec->mixer = stac927x_mixer;
 		break;
 	case STAC_DELL_BIOS:
+		/* configure the analog microphone on some laptops */
+		stac92xx_set_config_reg(codec, 0x0c, 0x90a79130);
 		/* correct the front output jack as a hp out */
 		stac92xx_set_config_reg(codec, 0x0f, 0x0227011f);
 		/* correct the front input jack as a mic */