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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2006-01-03 23:38:44 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-01-03 23:38:44 +0100 |
| commit | a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2cc (patch) | |
| tree | 5f3bd4dc24866f2b0e593b1457b1f22ec641139b /drivers/mmc/mmc.c | |
| parent | Linux v2.6.15 (diff) | |
| download | linux-a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2cc.tar.xz linux-a6f6c96b65d7f65a7a7bf5cbe874eda182a6b2cc.zip | |
[MMC] Improve MMC card block size selection
Select a block size for IO based on the read and write block size
combinations, and whether the card supports partial block reads
and/or partial block writes.
If we are able to satisfy block reads but not block writes, mark
the device read only.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc/mmc.c')
| -rw-r--r-- | drivers/mmc/mmc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index eb41391e06e9..6696f71363b9 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -550,6 +550,11 @@ static void mmc_decode_csd(struct mmc_card *card) csd->capacity = (1 + m) << (e + 2); csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); + csd->read_partial = UNSTUFF_BITS(resp, 79, 1); + csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); + csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); + csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); + csd->write_partial = UNSTUFF_BITS(resp, 21, 1); } else { /* * We only understand CSD structure v1.1 and v1.2. @@ -579,6 +584,11 @@ static void mmc_decode_csd(struct mmc_card *card) csd->capacity = (1 + m) << (e + 2); csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); + csd->read_partial = UNSTUFF_BITS(resp, 79, 1); + csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); + csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); + csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); + csd->write_partial = UNSTUFF_BITS(resp, 21, 1); } } |