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mmc: Allow 2 byte requests in 4-bit mode for tmio_mmc

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Adjust the tmio_mmc block size check to accept 2-byte requests in 4-bit
mode if the hardware supports it.

Tested with the SDHI hardware block included in sh7724.

Signed-off-by: Yusuke Goda <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
Acked-by: Magnus Damm <[email protected]>
Tested-by: Arnd Hannemann <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>
This commit is contained in:
Yusuke Goda 2010-08-30 11:50:19 +01:00 • committed by Samuel Ortiz
commit f1334fb3c3
3 changed files with 23 additions and 5 deletions
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17
drivers/mmc/host/tmio_mmc.c
View file

@ -658,14 +658,21 @@ static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
static int tmio_mmc_start_data(struct tmio_mmc_host *host,
struct mmc_data *data)
{
struct mfd_cell *cell = host->pdev->dev.platform_data;
struct tmio_mmc_data *pdata = cell->driver_data;
pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
data->blksz, data->blocks);
/* Hardware cannot perform 1 and 2 byte requests in 4 bit mode */
if (data->blksz < 4 && host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
pr_err("%s: %d byte block unsupported in 4 bit mode\n",
mmc_hostname(host->mmc), data->blksz);
return -EINVAL;
/* Some hardware cannot perform 2 byte requests in 4 bit mode */
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
pr_err("%s: %d byte block unsupported in 4 bit mode\n",
mmc_hostname(host->mmc), data->blksz);
return -EINVAL;
}
}
tmio_mmc_init_sg(host, data);