[alsa-devel] [PATCH v2] codecs: mc13783: add spi errata fix

Steffen Trumtrar s.trumtrar at pengutronix.de
Mon Sep 9 18:09:12 CEST 2013

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

Signed-off-by: Steffen Trumtrar <s.trumtrar at pengutronix.de>
Cc: stable at vger.kernel.org
Changes in v2:
	- use correct register defines
	- fix spelling error in commit description

 sound/soc/codecs/mc13783.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/mc13783.c b/sound/soc/codecs/mc13783.c
index 4d3c8fd..ea141e1 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);
 	return ret;

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