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ASoC: Avoid wraparound in wm_hubs DC servo correction 

If the correction wraps around then a substantial offset would be
introduced.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2010-03-29 15:24:40 +01:00
parent b5442a75de
commit 3fa49e3ad9
1 changed files with 4 additions and 2 deletions
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6
sound/soc/codecs/wm_hubs.c
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@ -113,13 +113,15 @@ static void calibrate_dc_servo(struct snd_soc_codec *codec)
/* HPOUT1L */
reg = snd_soc_read(codec, WM8993_DC_SERVO_READBACK_1) &
WM8993_DCS_INTEG_CHAN_0_MASK;;
reg += hubs->dcs_codes;
if (reg + hubs->dcs_codes > 0 && reg + hubs->dcs_codes < 0xff)
reg += hubs->dcs_codes;
dcs_cfg = reg << WM8993_DCS_DAC_WR_VAL_1_SHIFT;
/* HPOUT1R */
reg = snd_soc_read(codec, WM8993_DC_SERVO_READBACK_2) &
WM8993_DCS_INTEG_CHAN_1_MASK;
reg += hubs->dcs_codes;
if (reg + hubs->dcs_codes > 0 && reg + hubs->dcs_codes < 0xff)
reg += hubs->dcs_codes;
dcs_cfg |= reg;
/* Do it */