This is a note to let you know that I've just added the patch titled
ASoC: mc13783: add spi errata fix
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-mc13783-add-spi-errata-fix.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9f6f0afbb9fdabf6dcac642dfec457f28981e3f8 Mon Sep 17 00:00:00 2001
From: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
Date: Mon, 9 Sep 2013 18:09:12 +0200
Subject: ASoC: mc13783: add spi errata fix
From: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
commit 9f6f0afbb9fdabf6dcac642dfec457f28981e3f8 upstream.
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@xxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/soc/codecs/mc13783.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/sound/soc/codecs/mc13783.c
+++ b/sound/soc/codecs/mc13783.c
@@ -126,6 +126,10 @@ static int mc13783_write(struct snd_soc_
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;
Patches currently in stable-queue which might be from s.trumtrar@xxxxxxxxxxxxxx are
queue-3.11/asoc-mc13783-add-spi-errata-fix.patch
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