diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-03-29 15:24:40 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-04-05 16:17:39 +0100 |
| commit | 3fa49e3ad9ac20b15edfb0c51bbad36e45a84b17 (patch) | |
| tree | 17c81c5b8f5178ca807c07f4edacbcbfb2672ff0 | |
| parent | b5442a75deee293d10c2ab8f4a77013973c4c9e0 (diff) | |
| download | blackbird-op-linux-3fa49e3ad9ac20b15edfb0c51bbad36e45a84b17.tar.gz blackbird-op-linux-3fa49e3ad9ac20b15edfb0c51bbad36e45a84b17.zip | |
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>
| -rw-r--r-- | sound/soc/codecs/wm_hubs.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sound/soc/codecs/wm_hubs.c b/sound/soc/codecs/wm_hubs.c index 486bdd21a98a..3729a12b151f 100644 --- a/sound/soc/codecs/wm_hubs.c +++ b/sound/soc/codecs/wm_hubs.c @@ -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 */ |
