ARM: PL08x: move AHB master port selection into prep_* functions

As we initialize the default cctl value in the prep_* functions along
with the increment settings, we don't need to repeat the selection of
the AHB ports each time we create a LLI entry.  Do this in the prep_*
functions once per transfer.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 23 insertions, 24 deletions

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 72cc971e93e5..4ee0ab19b1b6 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -597,26 +597,6 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
         /* Get the default CCTL */
         cctl = txd->cctl;
 
-        /*
-         * On the PL080 we have two bus masters and we
-         * should select one for source and one for
-         * destination. We try to use AHB2 for the
-         * bus which does not increment (typically the
-         * peripheral) else we just choose something.
-         */
-        cctl &= ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
-        if (pl08x->vd->dualmaster) {
-                if (cctl & PL080_CONTROL_SRC_INCR)
-                        /* Source increments, use AHB2 for destination */
-                        cctl |= PL080_CONTROL_DST_AHB2;
-                else if (cctl & PL080_CONTROL_DST_INCR)
-                        /* Destination increments, use AHB2 for source */
-                        cctl |= PL080_CONTROL_SRC_AHB2;
-                else
-                        /* Just pick something, source AHB1 dest AHB2 */
-                        cctl |= PL080_CONTROL_DST_AHB2;
-        }
-
         /* Find maximum width of the source bus */
         txd->srcbus.maxwidth =
                 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >>
@@ -1340,14 +1320,25 @@ static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
         txd->direction = DMA_NONE;
         txd->srcbus.addr = src;
         txd->dstbus.addr = dest;
+        txd->len = len;
 
         /* Set platform data for m2m */
         txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
-        txd->cctl = pl08x->pd->memcpy_channel.cctl;
+        txd->cctl = pl08x->pd->memcpy_channel.cctl &
+                        ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
 
         /* Both to be incremented or the code will break */
         txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
-        txd->len = len;
+
+        /*
+         * On the PL080 we have two bus masters and we should select one for
+         * source and one for destination. We try to use AHB2 for the bus
+         * which does not increment (typically the peripheral) else we just
+         * choose something.
+         */
+        if (pl08x->vd->dualmaster)
+                /* Source increments, use AHB2 for destination */
+                txd->cctl |= PL080_CONTROL_DST_AHB2;
 
         ret = pl08x_prep_channel_resources(plchan, txd);
         if (ret)
@@ -1399,8 +1390,11 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
          * channel target address dynamically at runtime.
          */
         txd->direction = direction;
+        txd->len = sgl->length;
+
         txd->cctl = plchan->cd->cctl &
-                        ~(PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
+                        ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
+                          PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
                           PL080_CONTROL_PROT_MASK);
 
         /* Access the cell in privileged mode, non-bufferable, non-cacheable */
@@ -1409,6 +1403,9 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
         if (direction == DMA_TO_DEVICE) {
                 txd->ccfg |= PL080_FLOW_MEM2PER << PL080_CONFIG_FLOW_CONTROL_SHIFT;
                 txd->cctl |= PL080_CONTROL_SRC_INCR;
+                if (pl08x->vd->dualmaster)
+                        /* Source increments, use AHB2 for destination */
+                        txd->cctl |= PL080_CONTROL_DST_AHB2;
                 txd->srcbus.addr = sgl->dma_address;
                 if (plchan->runtime_addr)
                         txd->dstbus.addr = plchan->runtime_addr;
@@ -1417,6 +1414,9 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
         } else if (direction == DMA_FROM_DEVICE) {
                 txd->ccfg |= PL080_FLOW_PER2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
                 txd->cctl |= PL080_CONTROL_DST_INCR;
+                if (pl08x->vd->dualmaster)
+                        /* Destination increments, use AHB2 for source */
+                        txd->cctl |= PL080_CONTROL_SRC_AHB2;
                 if (plchan->runtime_addr)
                         txd->srcbus.addr = plchan->runtime_addr;
                 else
@@ -1427,7 +1427,6 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
                         "%s direction unsupported\n", __func__);
                 return NULL;
         }
-        txd->len = sgl->length;
 
         ret = pl08x_prep_channel_resources(plchan, txd);
         if (ret)