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Commit 3fa49e3a authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Avoid wraparound in wm_hubs DC servo correction 



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

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent b5442a75

sound/soc/codecs/wm_hubs.c

+4 −2
Original line number Diff line number Diff line
@@ -113,12 +113,14 @@ 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;;

		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;

		if (reg + hubs->dcs_codes > 0 && reg + hubs->dcs_codes < 0xff)

			reg += hubs->dcs_codes;

		dcs_cfg |= reg;