dmaengine: omap-dma: more consolidation of CCR register setup

We can move the handling of the DMA synchronisation control out of the
prepare functions; this can be pre-calculated when the DMA channel has
been allocated, so we don't need to duplicate this in both prepare
functions.
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

@@ -41,6 +41,7 @@ struct omap_chan {
 	struct list_head node;
 	void __iomem *channel_base;
 	const struct omap_dma_reg *reg_map;
+	uint32_t ccr;
 
 	struct dma_slave_config	cfg;
 	unsigned dma_sig;
@@ -552,6 +553,21 @@ static int omap_dma_alloc_chan_resources(struct dma_chan *chan)
 		}
 	}
 
+	if (dma_omap1()) {
+		if (__dma_omap16xx(od->plat->dma_attr)) {
+			c->ccr = CCR_OMAP31_DISABLE;
+			/* Duplicate what plat-omap/dma.c does */
+			c->ccr |= c->dma_ch + 1;
+		} else {
+			c->ccr = c->dma_sig & 0x1f;
+		}
+	} else {
+		c->ccr = c->dma_sig & 0x1f;
+		c->ccr |= (c->dma_sig & ~0x1f) << 14;
+	}
+	if (od->plat->errata & DMA_ERRATA_IFRAME_BUFFERING)
+		c->ccr |= CCR_BUFFERING_DISABLE;
+
 	return ret;
 }
 
@@ -787,7 +803,7 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
 	d->dev_addr = dev_addr;
 	d->es = es;
 
-	d->ccr = CCR_SYNC_FRAME;
+	d->ccr = c->ccr | CCR_SYNC_FRAME;
 	if (dir == DMA_DEV_TO_MEM)
 		d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT;
 	else
@@ -797,14 +813,6 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
 	d->csdp = es;
 
 	if (dma_omap1()) {
-		if (__dma_omap16xx(od->plat->dma_attr)) {
-			d->ccr |= CCR_OMAP31_DISABLE;
-			/* Duplicate what plat-omap/dma.c does */
-			d->ccr |= c->dma_ch + 1;
-		} else {
-			d->ccr |= c->dma_sig & 0x1f;
-		}
-
 		d->cicr |= CICR_TOUT_IE;
 
 		if (dir == DMA_DEV_TO_MEM)
@@ -812,16 +820,11 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
 		else
 			d->csdp |= CSDP_DST_PORT_TIPB | CSDP_SRC_PORT_EMIFF;
 	} else {
-		d->ccr |= (c->dma_sig & ~0x1f) << 14;
-		d->ccr |= c->dma_sig & 0x1f;
-
 		if (dir == DMA_DEV_TO_MEM)
 			d->ccr |= CCR_TRIGGER_SRC;
 
 		d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
 	}
-	if (od->plat->errata & DMA_ERRATA_IFRAME_BUFFERING)
-		d->ccr |= CCR_BUFFERING_DISABLE;
 	if (od->plat->errata & DMA_ERRATA_PARALLEL_CHANNELS)
 		d->clnk_ctrl = c->dma_ch;
 
@@ -903,7 +906,7 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
 	d->sg[0].fn = buf_len / period_len;
 	d->sglen = 1;
 
-	d->ccr = 0;
+	d->ccr = c->ccr;
 	if (dir == DMA_DEV_TO_MEM)
 		d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT;
 	else
@@ -916,14 +919,6 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
 	d->csdp = es;
 
 	if (dma_omap1()) {
-		if (__dma_omap16xx(od->plat->dma_attr)) {
-			d->ccr |= CCR_OMAP31_DISABLE;
-			/* Duplicate what plat-omap/dma.c does */
-			d->ccr |= c->dma_ch + 1;
-		} else {
-			d->ccr |= c->dma_sig & 0x1f;
-		}
-
 		d->cicr |= CICR_TOUT_IE;
 
 		if (dir == DMA_DEV_TO_MEM)
@@ -931,9 +926,6 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
 		else
 			d->csdp |= CSDP_DST_PORT_MPUI | CSDP_SRC_PORT_EMIFF;
 	} else {
-		d->ccr |= (c->dma_sig & ~0x1f) << 14;
-		d->ccr |= c->dma_sig & 0x1f;
-
 		if (burst)
 			d->ccr |= CCR_SYNC_PACKET;
 		else
@@ -946,8 +938,6 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
 
 		d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64;
 	}
-	if (od->plat->errata & DMA_ERRATA_IFRAME_BUFFERING)
-		d->ccr |= CCR_BUFFERING_DISABLE;
 
 	if (__dma_omap15xx(od->plat->dma_attr))
 		d->ccr |= CCR_AUTO_INIT | CCR_REPEAT;