ARM: S3C24XX: dma-s3c2443 - do not write into arbitary bits

The values read from the channel map always also contain the
DMA_CH_VALID (= 1<<31) setting, which should not get written
into the register, even if this bit is unused.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/arm/mach-s3c24xx/dma-s3c2443.c b/arch/arm/mach-s3c24xx/dma-s3c2443.c
index 5fe3539dc2b5..95b9f759fe97 100644
--- a/arch/arm/mach-s3c24xx/dma-s3c2443.c
+++ b/arch/arm/mach-s3c24xx/dma-s3c2443.c
@@ -128,7 +128,8 @@ static struct s3c24xx_dma_map __initdata s3c2443_dma_mappings[] = {
 static void s3c2443_dma_select(struct s3c2410_dma_chan *chan,
                                struct s3c24xx_dma_map *map)
 {
-        writel(map->channels[0] | S3C2443_DMAREQSEL_HW,
+        unsigned long chsel = map->channels[0] & (~DMA_CH_VALID);
+        writel(chsel | S3C2443_DMAREQSEL_HW,
                chan->regs + S3C2443_DMA_DMAREQSEL);
 }