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[RFC,07/11] dmaengine: PL08x: Fix reading the byte count in cctl

Message ID 1371416058-22047-8-git-send-email-tomasz.figa@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Tomasz Figa June 16, 2013, 8:54 p.m. UTC 
From: Alban Bedel <alban.bedel@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@avionic-design.de>
Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
---
 drivers/dma/amba-pl08x.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 0da5539..bb3b36b 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -471,6 +471,8 @@  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;
@@ -489,6 +491,8 @@  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;