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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
This commit is contained in:
Linus Torvalds 2014-11-21 16:24:27 -08:00
parent e6a588d086 1f0a5cbf61
commit 4ec69c7ebc
2 changed files with 46 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/dma/pl330.c
View File

@ -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,

61
drivers/dma/sun6i-dma.c
View File

@ -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) |
DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_DST_LINEAR_MODE |
DMA_CHAN_CFG_SRC_LINEAR_MODE;
DMA_CHAN_CFG_SRC_LINEAR_MODE |
DMA_CHAN_CFG_SRC_BURST(burst) |
DMA_CHAN_CFG_SRC_WIDTH(width) |
DMA_CHAN_CFG_DST_BURST(burst) |
DMA_CHAN_CFG_DST_WIDTH(width);
sun6i_dma_lli_add(NULL, v_lli, p_lli, txd);
@ -580,8 +580,6 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
err_dma_free:
dma_pool_free(sdev->pool, v_lli, p_lli);
err_txd_free:
kfree(txd);
return NULL;
@ -915,6 +913,7 @@ static int sun6i_dma_probe(struct platform_device *pdev)
sdc->slave.device_prep_dma_memcpy = sun6i_dma_prep_dma_memcpy;
sdc->slave.device_control = sun6i_dma_control;
sdc->slave.chancnt = NR_MAX_VCHANS;
sdc->slave.copy_align = 4;
sdc->slave.dev = &pdev->dev;