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| author | James Morris <jmorris@namei.org> | 2009-07-14 00:30:40 +1000 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-07-14 00:30:40 +1000 |
| commit | 7d45ecafb6792ca68da9517969d37d910601845f (patch) | |
| tree | a98b1074e5577e66a97963745f975404d0aac266 /drivers/mmc/host/mmc_spi.c | |
| parent | be940d6279c30a2d7c4e8d1d5435f957f594d66d (diff) | |
| parent | 7638d5322bd89d49e013a03fe2afaeb6d214fabd (diff) | |
Merge branch 'master' into next
Conflicts:
include/linux/personality.h
Use Linus' version.
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'drivers/mmc/host/mmc_spi.c')
| -rw-r--r-- | drivers/mmc/host/mmc_spi.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c index 240608cc7ae..a461017ce5c 100644 --- a/drivers/mmc/host/mmc_spi.c +++ b/drivers/mmc/host/mmc_spi.c @@ -1313,6 +1313,12 @@ static int mmc_spi_probe(struct spi_device *spi) struct mmc_spi_host *host; int status; + /* We rely on full duplex transfers, mostly to reduce + * per-transfer overheads (by making fewer transfers). + */ + if (spi->master->flags & SPI_MASTER_HALF_DUPLEX) + return -EINVAL; + /* MMC and SD specs only seem to care that sampling is on the * rising edge ... meaning SPI modes 0 or 3. So either SPI mode * should be legit. We'll use mode 0 since the steady state is 0, |