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[MMC] Improve MMC card block size selection

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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>
This commit is contained in:
Russell King 2006-01-03 22:38:44 +00:00 • committed by Russell King
parent 88026842b0
commit a6f6c96b65
3 changed files with 137 additions and 71 deletions
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5
include/linux/mmc/card.h
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@ -30,7 +30,12 @@ struct mmc_csd {
unsigned int tacc_ns;
unsigned int max_dtr;
unsigned int read_blkbits;
unsigned int write_blkbits;
unsigned int capacity;
unsigned int read_partial:1,
read_misalign:1,
write_partial:1
write_misalign:1;
};
struct sd_scr {