> -----Original Message----- > From: David Vrabel [mailto:david.vrabel@xxxxxxx] > Sent: Wednesday, February 10, 2010 5:52 AM > To: linux-mmc@xxxxxxxxxxxxxxx > Cc: David Vrabel; linux-omap@xxxxxxxxxxxxxxx; madhu.cr@xxxxxx > Subject: [PATCH 1/3] mmc: omap_hsmmc: use packet sync'd DMA > > 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. > What is the typical scenario here? Is it IO_RW_EXTENDED with block_mode turned off? > 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)); > How does this configuration help? Isn't the PACKET again a multiple of blksz? > @@ -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 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
