[alsa-devel] [PATCH 4/31] HDA patch_via.c: Modify VT1702 AA-Path max volume

[Li Bo]

[ALSA] HDA VIA: Modify VT1702 AA-Path max volume

according to customer request, VT1702 AA-Path max volume (12 dB) is too
high, so limit to 0 dB.

Signed-off-by: Lydia Wang <lydiawang at viatech.com.cn>

Index: sound-2.6/sound/pci/hda/patch_via.c
===================================================================
--- sound-2.6.orig/sound/pci/hda/patch_via.c	2009-10-04 23:05:19.000000000 +0800
+++ sound-2.6/sound/pci/hda/patch_via.c	2009-10-05 00:24:34.000000000 +0800
@@ -3166,6 +3166,12 @@
 	err = vt1702_auto_create_hp_ctls(spec, spec->autocfg.hp_pins[0]);
 	if (err < 0)
 		return err;
+	/* limit AA path volume to 0 dB */
+	snd_hda_override_amp_caps(codec, 0x1A, HDA_INPUT,
+				  (0x17 << AC_AMPCAP_OFFSET_SHIFT) |
+				  (0x17 << AC_AMPCAP_NUM_STEPS_SHIFT) |
+				  (0x5 << AC_AMPCAP_STEP_SIZE_SHIFT) |
+				  (1 << AC_AMPCAP_MUTE_SHIFT));
 	err = vt1702_auto_create_analog_input_ctls(spec, &spec->autocfg);
 	if (err < 0)
 		return err;