dmaengine: mv_xor_v2: remove unnecessary write to DESQ_STOP register

Remove unnecessary write to DESQ_STOP register, this register is used to
enable or disable the XOR engine, and not to issue all pending
descriptors in the queue. mv_xor_v2 driver already writes to this
register and enable XOR engine in the mv_xor_v2_descq_init() function,
called during initialization.
Signed-off-by: Hanna Hawa <hannah@marvell.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/mv_xor_v2.c

@@ -535,9 +535,6 @@ static void mv_xor_v2_issue_pending(struct dma_chan *chan)
 	mv_xor_v2_add_desc_to_desq(xor_dev, xor_dev->npendings);
 	xor_dev->npendings = 0;
 
-	/* Activate the channel */
-	writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
-
 	spin_unlock_bh(&xor_dev->lock);
 }