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Subject[PATCH 3.13 083/163] ASoC: davinci-mcasp: Correct rx format unit configuration
Date
3.13.11.9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Ujfalusi <peter.ujfalusi@ti.com>

commit fe0a29e163a5d045c73faab682a8dac71c2f8012 upstream.

In case of capture we should not use rotation. The reverse and mask is
enough to get the data align correctly from the bus to MCU:
Format data from bus after reverse (XRBUF)
S16_LE: |LSB|MSB|xxx|xxx| |xxx|xxx|MSB|LSB|
S24_3LE: |LSB|DAT|MSB|xxx| |xxx|MSB|DAT|LSB|
S24_LE: |LSB|DAT|MSB|xxx| |xxx|MSB|DAT|LSB|
S32_LE: |LSB|DAT|DAT|MSB| |MSB|DAT|DAT|LSB|

With this patch all supported formats will work for playback and capture.

Reported-by: Jyri Sarha <jsarha@ti.com> (broken S24_3LE capture)
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
sound/soc/davinci/davinci-mcasp.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 71e14bb3..9de1fe6 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -632,8 +632,17 @@ static int davinci_config_channel_size(struct davinci_audio_dev *dev,
{
u32 fmt;
u32 tx_rotate = (word_length / 4) & 0x7;
- u32 rx_rotate = (32 - word_length) / 4;
u32 mask = (1ULL << word_length) - 1;
+ /*
+ * For captured data we should not rotate, inversion and masking is
+ * enoguh to get the data to the right position:
+ * Format data from bus after reverse (XRBUF)
+ * S16_LE: |LSB|MSB|xxx|xxx| |xxx|xxx|MSB|LSB|
+ * S24_3LE: |LSB|DAT|MSB|xxx| |xxx|MSB|DAT|LSB|
+ * S24_LE: |LSB|DAT|MSB|xxx| |xxx|MSB|DAT|LSB|
+ * S32_LE: |LSB|DAT|DAT|MSB| |MSB|DAT|DAT|LSB|
+ */
+ u32 rx_rotate = 0;

/*
* if s BCLK-to-LRCLK ratio has been configured via the set_clkdiv()
--
1.9.1


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