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| author | J. Bruce Fields <bfields@citi.umich.edu> | 2009-08-21 11:27:29 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@citi.umich.edu> | 2009-08-21 11:27:29 -0400 |
| commit | e9dc122166b8d863d3057a66ada04838e5548e52 (patch) | |
| tree | 749e15bf719b64bf9113db7acd8e043d9742cb26 /drivers/mmc/host/mmc_spi.c | |
| parent | 560ab42ef923aaf2e4347315bdfcc74b2708972c (diff) | |
| parent | 405d8f8b1d936414da2093d4149ff790ff3f84a5 (diff) | |
Merge branch 'nfs-for-2.6.32' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6 into for-2.6.32-incoming
Conflicts:
net/sunrpc/cache.c
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 240608cc7ae9..a461017ce5ce 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, |