diff options
| author | Yusuke Goda <yusuke.goda.sx@renesas.com> | 2010-08-30 11:50:19 +0100 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2010-10-29 00:29:16 +0200 |
| commit | f1334fb3c3006ba109886158c0ad79512f928bc1 (patch) | |
| tree | 99038a92a9e1bf77e96129473614fad4d99a0d33 /drivers/mmc/host | |
| parent | 68accd7370a90b899ea6563ba9032e5a102ec1b5 (diff) | |
mmc: Allow 2 byte requests in 4-bit mode for tmio_mmc
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 <yusuke.goda.sx@renesas.com>
Signed-off-by: Matt Fleming <matt@console-pimps.org>
Acked-by: Magnus Damm <damm@opensource.se>
Tested-by: Arnd Hannemann <arnd@arndnet.de>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c index 1a47221d01a..e7765a89593 100644 --- a/drivers/mmc/host/tmio_mmc.c +++ b/drivers/mmc/host/tmio_mmc.c @@ -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); |