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

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);
 }