ASoC: mc13783: add spi errata fix

The MC13783 Chip Errata, Rev. 4 says, that depending on SPI clock
and main audio clock speed, the Audio Codec or Stereo DAC do sometimes
not start when programmed to do so. This is due to an internal clock
timing issue related to the loading of the SPI bits into the audio block.

On an i.MX27 based system, this issue lead to switched audio channels under
certain circumstances: RTC + Touch + Audio are used and loaded at startup.

The mentioned workaround of writing registers 40 and 41 two times is implemented
here.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/sound/soc/codecs/mc13783.c b/sound/soc/codecs/mc13783.c
index 4d3c8fd8c5db5aeec4632e958d3737a0d59adc0f..ea141e1d6f280733fdc832f7b5e2d054f2e8fff4 100644 (file)
--- a/sound/soc/codecs/mc13783.c
+++ b/sound/soc/codecs/mc13783.c
@@ -125,6 +125,10 @@ static int mc13783_write(struct snd_soc_codec *codec,
 
        ret = mc13xxx_reg_write(priv->mc13xxx, reg, value);
 
+       /* include errata fix for spi audio problems */
+       if (reg == MC13783_AUDIO_CODEC || reg == MC13783_AUDIO_DAC)
+               ret = mc13xxx_reg_write(priv->mc13xxx, reg, value);
+
        mc13xxx_unlock(priv->mc13xxx);
 
        return ret;