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authorSergei Shtylyov <sergei.shtylyov@cogentembedded.com>2013-05-21 23:07:54 +0400
committerTejun Heo <tj@kernel.org>2013-05-22 08:39:20 +0900
commitdf7e131f6359f20ed8f0a37db039c4f6420a18c2 (patch)
treecc850e7b524bc90c7e17ee881caf3aeccf0bf601 /drivers/ata
parente771451c0a831d96a7c14b0ca8a8ec671d98567b (diff)
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sata_rcar: clear STOP bit in bmdma_start() method
Iff bmdma_setup() has to stop a DMA transfer before starting a new one, then the STOP bit in the ATAPI_CONTROL1 register will remain set (it's only cleared when setting the START bit to 1) and then bmdma_start() method will set both START and STOP bits simultaneously which should abort the transfer being just started. Avoid that by explicitly clearing the STOP bit in bmdma_start() method (in this case it will be ignored on write). Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/sata_rcar.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
index 4799868bd73..a8e091aafdd 100644
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -549,6 +549,7 @@ static void sata_rcar_bmdma_start(struct ata_queued_cmd *qc)
/* start host DMA transaction */
dmactl = ioread32(priv->base + ATAPI_CONTROL1_REG);
+ dmactl &= ~ATAPI_CONTROL1_STOP;
dmactl |= ATAPI_CONTROL1_START;
iowrite32(dmactl, priv->base + ATAPI_CONTROL1_REG);
}