dmaengine: pl330: add burst mode according to dts config

Default is single mode, but some socs only support burst
mode. What's more, burst mode can improve memory accessing
efficiency.
In pl330 dts node:
Add peripherals_req_type_burst to enable burst mode.

Change-Id: I9c7ade28ef6901a746e53ee1cefeec55c8b24340
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 372b4359da97d4d7753233884e65c40abc7261cb..dece7d2d024f48478ac7c82bf3404020f75945f5 100644 (file)
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -491,6 +491,8 @@ struct pl330_dmac {
        /* Peripheral channels connected to this DMAC */
        unsigned int num_peripherals;
        struct dma_pl330_chan *peripherals; /* keep at end */
+       /* set peripherals request type according to soc config*/
+       enum pl330_cond peripherals_req_type;
        int quirks;
 };
 
@@ -1156,12 +1158,7 @@ static inline int _ldst_devtomem(struct pl330_dmac *pl330, unsigned dry_run,
                                 int cyc)
 {
        int off = 0;
-       enum pl330_cond cond;
-
-       if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP)
-               cond = BURST;
-       else
-               cond = SINGLE;
+       enum pl330_cond cond = pl330->peripherals_req_type;
 
        while (cyc--) {
                off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
@@ -1181,12 +1178,7 @@ static inline int _ldst_memtodev(struct pl330_dmac *pl330,
                                 const struct _xfer_spec *pxs, int cyc)
 {
        int off = 0;
-       enum pl330_cond cond;
-
-       if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP)
-               cond = BURST;
-       else
-               cond = SINGLE;
+       enum pl330_cond cond = pl330->peripherals_req_type;
 
        while (cyc--) {
                off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
@@ -2597,7 +2589,12 @@ static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
 
                desc->rqtype = direction;
                desc->rqcfg.brst_size = pch->burst_sz;
-               desc->rqcfg.brst_len = 1;
+
+               if (pl330->peripherals_req_type == BURST)
+                       desc->rqcfg.brst_len = pch->burst_len;
+               else
+                       desc->rqcfg.brst_len = 1;
+
                desc->bytes_requested = period_len;
                fill_px(&desc->px, dst, src, period_len);
 
@@ -2699,6 +2696,7 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 {
        struct dma_pl330_desc *first, *desc = NULL;
        struct dma_pl330_chan *pch = to_pchan(chan);
+       struct pl330_dmac *pl330 = pch->dmac;
        struct scatterlist *sg;
        int i;
        dma_addr_t addr;
@@ -2742,7 +2740,12 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
                }
 
                desc->rqcfg.brst_size = pch->burst_sz;
-               desc->rqcfg.brst_len = 1;
+
+               if (pl330->peripherals_req_type == BURST)
+                       desc->rqcfg.brst_len = pch->burst_len;
+               else
+                       desc->rqcfg.brst_len = 1;
+
                desc->rqtype = direction;
                desc->bytes_requested = sg_dma_len(sg);
        }
@@ -2838,6 +2841,11 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 
        pl330->mcbufsz = pdat ? pdat->mcbuf_sz : 0;
 
+       if (of_find_property(np, "peripherals-req-type-burst", NULL))
+               pl330->peripherals_req_type = BURST;
+       else
+               pl330->peripherals_req_type = SINGLE;
+
        /* get quirk */
        for (i = 0; i < ARRAY_SIZE(of_quirks); i++)
                if (of_property_read_bool(np, of_quirks[i].quirk))