From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
SYS/RT/Audio DMAC have both TCR/TCRB register.
Its difference is transfer counter value of read (= TCR)
or write (= TCRB). The relationship is like below.
TCR TCRB
[SOURCE] -> [DMAC] -> [DESTINATION]
Thus, we want to read TCRB instead of TCR for residue.
Otherwise, Sound Capture has noise after PluseAudio support
(= 07b7acb51d2 ("ASoC: rsnd: update pointer more accurate"))
Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@xxxxxxxxxxx>
[Kuninori: added detail information in log]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
drivers/dma/sh/rcar-dmac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 2b2c7db..50c4950 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -1310,7 +1310,7 @@ static unsigned int rcar_dmac_chan_get_residue(struct rcar_dmac_chan *chan,
}
/* Add the residue for the current chunk. */
- residue += rcar_dmac_chan_read(chan, RCAR_DMATCR) << desc->xfer_shift;
+ residue += rcar_dmac_chan_read(chan, RCAR_DMATCRB) << desc->xfer_shift;
return residue;
}
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe dmaengine" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
