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authorSteffen Trumtrar <s.trumtrar@pengutronix.de>2013-09-09 20:09:12 +0400
committerMark Brown <broonie@linaro.org>2013-09-11 14:16:48 +0400
commit9f6f0afbb9fdabf6dcac642dfec457f28981e3f8 (patch)
treeee5b4779d24ea40ef03c5a079bb5476789ed2fae /sound/soc/codecs/mc13783.c
parent5df498a27ab385294fdb7cad19c623d4da94a780 (diff)
downloadlinux-9f6f0afbb9fdabf6dcac642dfec457f28981e3f8.tar.xz
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>
Diffstat (limited to 'sound/soc/codecs/mc13783.c')
-rw-r--r--sound/soc/codecs/mc13783.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/soc/codecs/mc13783.c b/sound/soc/codecs/mc13783.c
index 4d3c8fd8c5db..ea141e1d6f28 100644
--- 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;