linux-kernel - [157/272] ASoC: Handle low measured DC offsets for wm

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Date:	Tue, 15 Feb 2011 16:13:34 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: [157/272] ASoC: Handle low measured DC offsets for wm_hubs devices

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Mark Brown <broonie@...nsource.wolfsonmicro.com>

commit 20a4e7fc7e213365ea3771d7bf1e10a6bab853be upstream.

The DC servo codes are actually signed numbers so need to be treated as
such.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@...mlogic.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/soc/codecs/wm_hubs.c |   15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

--- a/sound/soc/codecs/wm_hubs.c
+++ b/sound/soc/codecs/wm_hubs.c
@@ -92,6 +92,7 @@ static void wait_for_dc_servo(struct snd
 static void calibrate_dc_servo(struct snd_soc_codec *codec)
 {
 	struct wm_hubs_data *hubs = snd_soc_codec_get_drvdata(codec);
+	s8 offset;
 	u16 reg, reg_l, reg_r, dcs_cfg;
 
 	/* Set for 32 series updates */
@@ -130,16 +131,14 @@ static void calibrate_dc_servo(struct sn
 		dev_dbg(codec->dev, "DCS input: %x %x\n", reg_l, reg_r);
 
 		/* HPOUT1L */
-		if (reg_l + hubs->dcs_codes > 0 &&
-		    reg_l + hubs->dcs_codes < 0xff)
-			reg_l += hubs->dcs_codes;
-		dcs_cfg = reg_l << WM8993_DCS_DAC_WR_VAL_1_SHIFT;
+		offset = reg_l;
+		offset += hubs->dcs_codes;
+		dcs_cfg = (u8)offset << WM8993_DCS_DAC_WR_VAL_1_SHIFT;
 
 		/* HPOUT1R */
-		if (reg_r + hubs->dcs_codes > 0 &&
-		    reg_r + hubs->dcs_codes < 0xff)
-			reg_r += hubs->dcs_codes;
-		dcs_cfg |= reg_r;
+		offset = reg_r;
+		offset += hubs->dcs_codes;
+		dcs_cfg |= (u8)offset;
 
 		dev_dbg(codec->dev, "DCS result: %x\n", dcs_cfg);
 


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