From bc29e262c3062682c6099bd455ae8544916f723e Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens@ladisch.de>
Date: Mon, 10 Jan 2011 16:11:32 +0100
Subject: ALSA: virtuoso: use headphone gain setting only on front DAC

Do not apply the headphone gain offset to any but the front DAC.  These
DACs would not be used in headphone mode, so this saves a few register
writes.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/oxygen/xonar_pcm179x.c b/sound/pci/oxygen/xonar_pcm179x.c
index 2d0a634..e15ecee 100644
--- a/sound/pci/oxygen/xonar_pcm179x.c
+++ b/sound/pci/oxygen/xonar_pcm179x.c
@@ -319,6 +319,7 @@ static void pcm1796_registers_init(struct oxygen *chip)
 		pcm1796_write(chip, i, 20,
 			      data->pcm1796_regs[0][20 - PCM1796_REG_BASE]);
 		pcm1796_write(chip, i, 21, 0);
+		gain_offset = 0;
 	}
 }
 
@@ -615,6 +616,7 @@ static void update_pcm1796_volume(struct oxygen *chip)
 				     + gain_offset);
 		pcm1796_write_cached(chip, i, 17, chip->dac_volume[i * 2 + 1]
 				     + gain_offset);
+		gain_offset = 0;
 	}
 }
 
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