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dma: edma: fix slave config dependency on direction 

The edma_slave_config() implementation depends on the
direction field such that it will not properly configure
a slave channel when called without direction set.

This fixes the implementation so that the slave config
is copied as is and prep_slave_sg() handles the
direction dependent handling. spi-omap2-mcspi and
omap_hsmmc both expose this bug as they configure the
slave channel config from a common path with an unconfigured
direction field.

Signed-off-by: Matt Porter <mporter@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Matt Porter 2013-01-10 13:41:04 -05:00 committed by Vinod Koul
parent 3a95b9fbba
commit 661f7cb55c
1 changed files with 27 additions and 28 deletions
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55
drivers/dma/edma.c
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@ -69,9 +69,7 @@ struct edma_chan {
int ch_num;
bool alloced;
int slot[EDMA_MAX_SLOTS];
dma_addr_t addr;
int addr_width;
int maxburst;
struct dma_slave_config cfg;
};
struct edma_cc {
@ -178,29 +176,14 @@ static int edma_terminate_all(struct edma_chan *echan)
return 0;
}
static int edma_slave_config(struct edma_chan *echan,
struct dma_slave_config *config)
struct dma_slave_config *cfg)
{
if ((config->src_addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES) ||
(config->dst_addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES))
if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
return -EINVAL;
if (config->direction == DMA_MEM_TO_DEV) {
if (config->dst_addr)
echan->addr = config->dst_addr;
if (config->dst_addr_width)
echan->addr_width = config->dst_addr_width;
if (config->dst_maxburst)
echan->maxburst = config->dst_maxburst;
} else if (config->direction == DMA_DEV_TO_MEM) {
if (config->src_addr)
echan->addr = config->src_addr;
if (config->src_addr_width)
echan->addr_width = config->src_addr_width;
if (config->src_maxburst)
echan->maxburst = config->src_maxburst;
}
memcpy(&echan->cfg, cfg, sizeof(echan->cfg));
return 0;
}
@ -235,6 +218,9 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
struct edma_chan *echan = to_edma_chan(chan);
struct device *dev = chan->device->dev;
struct edma_desc *edesc;
dma_addr_t dev_addr;
enum dma_slave_buswidth dev_width;
u32 burst;
struct scatterlist *sg;
int i;
int acnt, bcnt, ccnt, src, dst, cidx;
@ -243,7 +229,20 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
if (unlikely(!echan || !sgl || !sg_len))
return NULL;
if (echan->addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
if (direction == DMA_DEV_TO_MEM) {
dev_addr = echan->cfg.src_addr;
dev_width = echan->cfg.src_addr_width;
burst = echan->cfg.src_maxburst;
} else if (direction == DMA_MEM_TO_DEV) {
dev_addr = echan->cfg.dst_addr;
dev_width = echan->cfg.dst_addr_width;
burst = echan->cfg.dst_maxburst;
} else {
dev_err(dev, "%s: bad direction?\n", __func__);
return NULL;
}
if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
dev_err(dev, "Undefined slave buswidth\n");
return NULL;
}
@ -275,14 +274,14 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
}
}
acnt = echan->addr_width;
acnt = dev_width;
/*
* If the maxburst is equal to the fifo width, use
* A-synced transfers. This allows for large contiguous
* buffer transfers using only one PaRAM set.
*/
if (echan->maxburst == 1) {
if (burst == 1) {
edesc->absync = false;
ccnt = sg_dma_len(sg) / acnt / (SZ_64K - 1);
bcnt = sg_dma_len(sg) / acnt - ccnt * (SZ_64K - 1);
@ -302,7 +301,7 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
*/
} else {
edesc->absync = true;
bcnt = echan->maxburst;
bcnt = burst;
ccnt = sg_dma_len(sg) / (acnt * bcnt);
if (ccnt > (SZ_64K - 1)) {
dev_err(dev, "Exceeded max SG segment size\n");
@ -313,13 +312,13 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
if (direction == DMA_MEM_TO_DEV) {
src = sg_dma_address(sg);
dst = echan->addr;
dst = dev_addr;
src_bidx = acnt;
src_cidx = cidx;
dst_bidx = 0;
dst_cidx = 0;
} else {
src = echan->addr;
src = dev_addr;
dst = sg_dma_address(sg);
src_bidx = 0;
src_cidx = 0;