Use packet sync'd DMA in the omap_hsmmc driver to avoid the
restriction that transfers must be a multiple of the block size. This
is required for byte-mode transfers to SDIO cards.
Signed-off-by: David Vrabel <david.vrabel@xxxxxxx>
---
drivers/mmc/host/omap_hsmmc.c | 17 +++++------------
1 files changed, 5 insertions(+), 12 deletions(-)
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 4b23225..e7142a2 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -114,6 +114,7 @@
#define MMC_TIMEOUT_MS 20
#define OMAP_MMC_MASTER_CLOCK 96000000
+#define OMAP_HSMMC_FIFO_WORDS (512/4)
#define DRIVER_NAME "mmci-omap-hs"
/* Timeouts for entering power saving states on inactivity, msec */
@@ -887,12 +888,12 @@ static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
dma_ch = host->dma_ch;
if (data->flags & MMC_DATA_WRITE) {
omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
- (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
+ (host->mapbase + OMAP_HSMMC_DATA), 0, OMAP_HSMMC_FIFO_WORDS);
omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
sg_dma_address(sgl), 0, 0);
} else {
omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
- (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
+ (host->mapbase + OMAP_HSMMC_DATA), 0, OMAP_HSMMC_FIFO_WORDS);
omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
sg_dma_address(sgl), 0, 0);
}
@@ -901,7 +902,7 @@ static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
nblk = sg_dma_len(sgl) / blksz;
omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
- blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
+ blksz / 4, nblk, OMAP_DMA_SYNC_PACKET,
omap_hsmmc_get_dma_sync_dev(host, data),
!(data->flags & MMC_DATA_WRITE));
@@ -944,17 +945,9 @@ static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *data)
static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
struct mmc_request *req)
{
- int dma_ch = 0, ret = 0, err = 1, i;
+ int dma_ch = 0, ret = 0, err = 1;
struct mmc_data *data = req->data;
- /* Sanity check: all the SG entries must be aligned by block size. */
- for (i = 0; i < data->sg_len; i++) {
- struct scatterlist *sgl;
-
- sgl = data->sg + i;
- if (sgl->length % data->blksz)
- return -EINVAL;
- }
if ((data->blksz % 4) != 0)
/* REVISIT: The MMC buffer increments only when MSB is written.
* Return error for blksz which is non multiple of four.
--
1.6.3.3
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