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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
This commit is contained in:
Mark Brown 2011-01-21 12:47:33 +00:00
parent dc5a460a1b
commit 20a4e7fc7e
1 changed files with 7 additions and 8 deletions
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15
sound/soc/codecs/wm_hubs.c
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@ -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);