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[MMC] extend data timeout for writes

Browse source 
The CSD contains a "read2write factor" which determines the multiplier to
be applied to the read timeout to obtain the write timeout.  We were
ignoring this parameter, resulting in the possibility for writes being
timed out too early.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2006-05-02 17:24:59 +01:00 committed by Russell King
parent 81d38428df
commit 37be4e7809
3 changed files with 9 additions and 0 deletions
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2
drivers/mmc/mmc.c
View file

@ -549,6 +549,7 @@ static void mmc_decode_csd(struct mmc_card *card)
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->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
} else {
@ -583,6 +584,7 @@ static void mmc_decode_csd(struct mmc_card *card)
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->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
}

6
drivers/mmc/mmc_block.c
View file

@ -187,6 +187,12 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
brq.cmd.opcode = MMC_WRITE_BLOCK;
brq.data.flags |= MMC_DATA_WRITE;
brq.data.blocks = 1;
/*
* Scale up the timeout by the r2w factor
*/
brq.data.timeout_ns <<= card->csd.r2w_factor;
brq.data.timeout_clks <<= card->csd.r2w_factor;
}
if (brq.data.blocks > 1) {

1
include/linux/mmc/card.h
View file

@ -28,6 +28,7 @@ struct mmc_csd {
unsigned short cmdclass;
unsigned short tacc_clks;
unsigned int tacc_ns;
unsigned int r2w_factor;
unsigned int max_dtr;
unsigned int read_blkbits;
unsigned int write_blkbits;