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dmaengine: sun6i: Fix memcpy operation

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The prep_memcpy call was not setting any meaningful burst and width because it
was relying on the dma_slave_config was not set already.

Rework the needed conversion functions, and hardcode the width and burst to
use.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: stable@vger.kernel.org
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Maxime Ripard 2014-11-11 19:35:52 +01:00 committed by Vinod Koul
parent 0df1f2487d
commit 1f9cd915b6
1 changed files with 30 additions and 31 deletions
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61
drivers/dma/sun6i-dma.c
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@ -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;