[alsa-devel] [RFC PATCH v2 06/12] dmaengine: PL08x: Fix reading the byte count in cctl

[Tomasz Figa]

From: Alban Bedel <alban.bedel at avionic-design.de>

There are more fields than just SWIDTH in CH_CONTROL register, so read
register value must be masked in addition to shifting.

Signed-off-by: Alban Bedel <alban.bedel at avionic-design.de>
Signed-off-by: Tomasz Figa <tomasz.figa at gmail.com>
---
 drivers/dma/amba-pl08x.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 89b8120..1eeb911 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -469,6 +469,8 @@ static inline u32 get_bytes_in_cctl(u32 cctl)
 	/* The source width defines the number of bytes */
 	u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK;
 
+	cctl &= PL080_CONTROL_SWIDTH_MASK;
+
 	switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) {
 	case PL080_WIDTH_8BIT:
 		break;
@@ -487,6 +489,8 @@ static inline u32 get_bytes_in_cctl_pl080s(u32 cctl, u32 cctl1)
 	/* The source width defines the number of bytes */
 	u32 bytes = cctl1 & PL080S_CONTROL_TRANSFER_SIZE_MASK;
 
+	cctl &= PL080_CONTROL_SWIDTH_MASK;
+
 	switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) {
 	case PL080_WIDTH_8BIT:
 		break;
-- 
1.8.2.1