Re: [PATCH v2] ALSA: ASoC: McASP: Fix data rotation for playback. Enables 24bit audio playback
On Fri, Jan 18, 2013 at 10:17:00AM +0100, Michal Bachraty wrote: > u32 rotate = (32 - word_length) / 4; > This implementation is wrong, but it works only for 16, or 32 bit audio data. Applied, thanks. signature.asc Description: Digital signature
Re: [PATCH v2] ALSA: ASoC: McASP: Fix data rotation for playback. Enables 24bit audio playback
On Fri, Jan 18, 2013 at 10:17:00AM +0100, Michal Bachraty wrote: u32 rotate = (32 - word_length) / 4; This implementation is wrong, but it works only for 16, or 32 bit audio data. Applied, thanks. signature.asc Description: Digital signature
[PATCH v2] ALSA: ASoC: McASP: Fix data rotation for playback. Enables 24bit audio playback
u32 rotate = (32 - word_length) / 4;
This implementation is wrong, but it works only for 16, or 32 bit audio data.
(rotation for 16 or 32 bit is same as in code I present) Mcasp rotated data in
4 bits (max value 0x7)and then masks them . That data are sended to i2s bus.
For 24 bit or 20 bit or other data formats, this code rotates data badly and
you hear somethink like noise. You need to use
u32 rotate = (word_length / 4) & 0x7;
to proper data rotation.
Signed-off-by: Michal Bachraty
---
changes v2: add commit log.
sound/soc/davinci/davinci-mcasp.c |2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/davinci/davinci-mcasp.c
b/sound/soc/davinci/davinci-mcasp.c
index 13f8d73..a03bece 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -626,7 +626,7 @@ static int davinci_config_channel_size(struct
davinci_audio_dev *dev,
int word_length)
{
u32 fmt;
- u32 rotate = (32 - word_length) / 4;
+ u32 rotate = (word_length / 4) & 0x7;
u32 mask = (1ULL << word_length) - 1;
/*
--
1.7.9.5
--
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[PATCH v2] ALSA: ASoC: McASP: Fix data rotation for playback. Enables 24bit audio playback
u32 rotate = (32 - word_length) / 4;
This implementation is wrong, but it works only for 16, or 32 bit audio data.
(rotation for 16 or 32 bit is same as in code I present) Mcasp rotated data in
4 bits (max value 0x7)and then masks them . That data are sended to i2s bus.
For 24 bit or 20 bit or other data formats, this code rotates data badly and
you hear somethink like noise. You need to use
u32 rotate = (word_length / 4) 0x7;
to proper data rotation.
Signed-off-by: Michal Bachraty michal.bachr...@streamunlimited.com
---
changes v2: add commit log.
sound/soc/davinci/davinci-mcasp.c |2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/davinci/davinci-mcasp.c
b/sound/soc/davinci/davinci-mcasp.c
index 13f8d73..a03bece 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -626,7 +626,7 @@ static int davinci_config_channel_size(struct
davinci_audio_dev *dev,
int word_length)
{
u32 fmt;
- u32 rotate = (32 - word_length) / 4;
+ u32 rotate = (word_length / 4) 0x7;
u32 mask = (1ULL word_length) - 1;
/*
--
1.7.9.5
--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
