Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma

Pull dmaengine fixes from Vinod Koul:
 "We have couple of fixes for dmaengine queued up:
   - dma mempcy fix for dma configuration of sun6i by Maxime
   - pl330 fixes: First the fixing allocation for data buffers by Liviu
     and then Jon's fixe for fifo width and usage"

* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: Fix allocation size for PL330 data buffer depth.
  dmaengine: pl330: Limit MFIFO usage for memcpy to avoid exhausting entries
  dmaengine: pl330: Align DMA memcpy operations to MFIFO width
  dmaengine: sun6i: Fix memcpy operation

2 files changed, 46 insertions, 38 deletions

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 4839bfa74a10..19a99743cf52 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -271,7 +271,7 @@ struct pl330_config {
 #define DMAC_MODE_NS    (1 << 0)
         unsigned int    mode;
         unsigned int    data_bus_width:10; /* In number of bits */
-        unsigned int    data_buf_dep:10;
+        unsigned int    data_buf_dep:11;
         unsigned int    num_chan:4;
         unsigned int    num_peri:6;
         u32             peri_ns;
@@ -2336,7 +2336,7 @@ static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
         int burst_len;
 
         burst_len = pl330->pcfg.data_bus_width / 8;
-        burst_len *= pl330->pcfg.data_buf_dep;
+        burst_len *= pl330->pcfg.data_buf_dep / pl330->pcfg.num_chan;
         burst_len >>= desc->rqcfg.brst_size;
 
         /* src/dst_burst_len can't be more than 16 */
@@ -2459,16 +2459,25 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
         /* Select max possible burst size */
         burst = pl330->pcfg.data_bus_width / 8;
 
-        while (burst > 1) {
-                if (!(len % burst))
-                        break;
+        /*
+         * Make sure we use a burst size that aligns with all the memcpy
+         * parameters because our DMA programming algorithm doesn't cope with
+         * transfers which straddle an entry in the DMA device's MFIFO.
+         */
+        while ((src | dst | len) & (burst - 1))
                 burst /= 2;
-        }
 
         desc->rqcfg.brst_size = 0;
         while (burst != (1 << desc->rqcfg.brst_size))
                 desc->rqcfg.brst_size++;
 
+        /*
+         * If burst size is smaller than bus width then make sure we only
+         * transfer one at a time to avoid a burst stradling an MFIFO entry.
+         */
+        if (desc->rqcfg.brst_size * 8 < pl330->pcfg.data_bus_width)
+                desc->rqcfg.brst_len = 1;
+
         desc->rqcfg.brst_len = get_burst_len(desc, len);
 
         desc->txd.flags = flags;
@@ -2732,7 +2741,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 
 
         dev_info(&adev->dev,
-                "Loaded driver for PL330 DMAC-%d\n", adev->periphid);
+                "Loaded driver for PL330 DMAC-%x\n", adev->periphid);
         dev_info(&adev->dev,
                 "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
                 pcfg->data_buf_dep, pcfg->data_bus_width / 8, pcfg->num_chan,
diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index 3aa10b328254..91292f5513ff 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -230,30 +230,25 @@ static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev *sdev,
                 readl(pchan->base + DMA_CHAN_CUR_PARA));
 }
 
-static inline int convert_burst(u32 maxburst, u8 *burst)
+static inline s8 convert_burst(u32 maxburst)
 {
         switch (maxburst) {
         case 1:
-                *burst = 0;
-                break;
+                return 0;
         case 8:
-                *burst = 2;
-                break;
+                return 2;
         default:
                 return -EINVAL;
         }
-
-        return 0;
 }
 
-static inline int convert_buswidth(enum dma_slave_buswidth addr_width, u8 *width)
+static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
 {
         if ((addr_width < DMA_SLAVE_BUSWIDTH_1_BYTE) ||
             (addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES))
                 return -EINVAL;
 
-        *width = addr_width >> 1;
-        return 0;
+        return addr_width >> 1;
 }
 
 static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
@@ -284,26 +279,25 @@ static inline int sun6i_dma_cfg_lli(struct sun6i_dma_lli *lli,
                                     struct dma_slave_config *config)
 {
         u8 src_width, dst_width, src_burst, dst_burst;
-        int ret;
 
         if (!config)
                 return -EINVAL;
 
-        ret = convert_burst(config->src_maxburst, &src_burst);
-        if (ret)
-                return ret;
+        src_burst = convert_burst(config->src_maxburst);
+        if (src_burst)
+                return src_burst;
 
-        ret = convert_burst(config->dst_maxburst, &dst_burst);
-        if (ret)
-                return ret;
+        dst_burst = convert_burst(config->dst_maxburst);
+        if (dst_burst)
+                return dst_burst;
 
-        ret = convert_buswidth(config->src_addr_width, &src_width);
-        if (ret)
-                return ret;
+        src_width = convert_buswidth(config->src_addr_width);
+        if (src_width)
+                return src_width;
 
-        ret = convert_buswidth(config->dst_addr_width, &dst_width);
-        if (ret)
-                return ret;
+        dst_width = convert_buswidth(config->dst_addr_width);
+        if (dst_width)
+                return dst_width;
 
         lli->cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |
                 DMA_CHAN_CFG_SRC_WIDTH(src_width) |
@@ -542,11 +536,10 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
 {
         struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
         struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
-        struct dma_slave_config *sconfig = &vchan->cfg;
         struct sun6i_dma_lli *v_lli;
         struct sun6i_desc *txd;
         dma_addr_t p_lli;
-        int ret;
+        s8 burst, width;
 
         dev_dbg(chan2dev(chan),
                 "%s; chan: %d, dest: %pad, src: %pad, len: %zu. flags: 0x%08lx\n",
@@ -565,14 +558,21 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
                 goto err_txd_free;
         }
 
-        ret = sun6i_dma_cfg_lli(v_lli, src, dest, len, sconfig);
-        if (ret)
-                goto err_dma_free;
+        v_lli->src = src;
+        v_lli->dst = dest;
+        v_lli->len = len;
+        v_lli->para = NORMAL_WAIT;
 
+        burst = convert_burst(8);
+        width = convert_buswidth(DMA_SLAVE_BUSWIDTH_4_BYTES);
         v_lli->cfg |= DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |