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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-01-21 15:47:33 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-01-21 21:20:16 +0300
commit20a4e7fc7e213365ea3771d7bf1e10a6bab853be (patch)
tree51d72efa1c5e306a4dfd2feb791675c27a634206 /sound
parentdc5a460a1bfa44273653700e33d4e7051194cbfd (diff)
downloadlinux-20a4e7fc7e213365ea3771d7bf1e10a6bab853be.tar.xz
ASoC: Handle low measured DC offsets for wm_hubs devices
The DC servo codes are actually signed numbers so need to be treated as such. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Cc: stable@kernel.org
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/codecs/wm_hubs.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/sound/soc/codecs/wm_hubs.c b/sound/soc/codecs/wm_hubs.c
index c466982eed23..613df5db0b32 100644
--- a/sound/soc/codecs/wm_hubs.c
+++ b/sound/soc/codecs/wm_hubs.c
@@ -91,6 +91,7 @@ static void wait_for_dc_servo(struct snd_soc_codec *codec, unsigned int op)
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;
/* If we're using a digital only path and have a previously
@@ -149,16 +150,14 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
hubs->dcs_codes);
/* 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);