dmaengine: omap-dma: consolidate clearing channel status register

Consolidate clearing of the channel status register, rather than open
coding the same functionality in two places.
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/dma/omap-dma.c

@@ -169,6 +169,14 @@ static void omap_dma_desc_free(struct virt_dma_desc *vd)
 	kfree(container_of(vd, struct omap_desc, vd));
 }
 
+static void omap_dma_clear_csr(struct omap_chan *c)
+{
+	if (dma_omap1())
+		c->plat->dma_read(CSR, c->dma_ch);
+	else
+		c->plat->dma_write(~0, CSR, c->dma_ch);
+}
+
 static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
 {
 	struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
@@ -191,11 +199,7 @@ static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
 	} else if (od->plat->errata & DMA_ERRATA_PARALLEL_CHANNELS)
 		c->plat->dma_write(c->dma_ch, CLNK_CTRL, c->dma_ch);
 
-	/* Clear CSR */
-	if (dma_omap1())
-		c->plat->dma_read(CSR, c->dma_ch);
-	else
-		c->plat->dma_write(~0, CSR, c->dma_ch);
+	omap_dma_clear_csr(c);
 
 	/* Enable interrupts */
 	c->plat->dma_write(d->cicr, CICR, c->dma_ch);
@@ -214,11 +218,7 @@ static void omap_dma_stop(struct omap_chan *c)
 	/* disable irq */
 	c->plat->dma_write(0, CICR, c->dma_ch);
 
-	/* Clear CSR */
-	if (dma_omap1())
-		c->plat->dma_read(CSR, c->dma_ch);
-	else
-		c->plat->dma_write(~0, CSR, c->dma_ch);
+	omap_dma_clear_csr(c);
 
 	val = c->plat->dma_read(CCR, c->dma_ch);
 	if (od->plat->errata & DMA_ERRATA_i541 && val & CCR_TRIGGER_SRC) {