net: ethernet: ti: davinci_cpdma: fix fixed prio cpdma ctlr configuration

The dma ctlr is reseted to 0 while cpdma soft reset, thus cpdma ctlr
cannot be configured after cpdma is stopped. So restoring content
of cpdma ctlr while off/on procedure is needed. The cpdma ctlr off/on
procedure is present while interface down/up and while changing number
of channels with ethtool. In order to not restore content in many
places, move it to cpdma_ctlr_start().

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw.c

@@ -1376,10 +1376,6 @@ static int cpsw_ndo_open(struct net_device *ndev)
 				  ALE_ALL_PORTS, ALE_ALL_PORTS, 0, 0);
 
 	if (!cpsw_common_res_usage_state(cpsw)) {
-		/* setup tx dma to fixed prio and zero offset */
-		cpdma_control_set(cpsw->dma, CPDMA_TX_PRIO_FIXED, 1);
-		cpdma_control_set(cpsw->dma, CPDMA_RX_BUFFER_OFFSET, 0);
-
 		/* disable priority elevation */
 		__raw_writel(0, &cpsw->regs->ptype);