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mmc: sdio: Fix to support any block size optimally 

This patch allows any block size to be set on the SDIO link,
and still have an arbitrary sized packet (adjusted in size by
using sdio_align_size) transferred in an optimal way
(preferably one transfer).

Previously if the block size was larger than the default of
512 bytes and the transfer size was exactly one block size
(possibly thanks to using sdio_align_size to get an optimal
transfer size), it was sent as a number of byte transfers instead
of one block transfer. Also if the number of blocks was
(max_blocks * N) + 1, the tranfer would be conducted with a number
of blocks and finished off with a number of byte transfers.

When doing this change it was also possible to break out the quirk
for broken byte mode in a much cleaner way, and collect the logic of
when to do byte or block transfer in one function instead of two.

Signed-off-by: Stefan Nilsson XK <stefan.xk.nilsson@stericsson.com>
Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Stefan Nilsson XK 2011-10-26 10:52:17 +02:00 committed by Chris Ball
parent fffe5d5aa0
commit 052d81da6e
2 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/mmc/core/sdio_io.c
View File

@ -196,6 +196,9 @@ static inline unsigned int sdio_max_byte_size(struct sdio_func *func)
else else
mval = min(mval, func->max_blksize); mval = min(mval, func->max_blksize);
if (mmc_card_broken_byte_mode_512(func->card))
return min(mval, 511u);
return min(mval, 512u); /* maximum size for byte mode */ return min(mval, 512u); /* maximum size for byte mode */
} }
@ -314,7 +317,7 @@ static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
func->card->host->max_seg_size / func->cur_blksize); func->card->host->max_seg_size / func->cur_blksize);
max_blocks = min(max_blocks, 511u); max_blocks = min(max_blocks, 511u);
while (remainder > func->cur_blksize) { while (remainder >= func->cur_blksize) {
unsigned blocks; unsigned blocks;
blocks = remainder / func->cur_blksize; blocks = remainder / func->cur_blksize;
@ -339,8 +342,9 @@ static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
while (remainder > 0) { while (remainder > 0) {
size = min(remainder, sdio_max_byte_size(func)); size = min(remainder, sdio_max_byte_size(func));
/* Indicate byte mode by setting "blocks" = 0 */
ret = mmc_io_rw_extended(func->card, write, func->num, addr, ret = mmc_io_rw_extended(func->card, write, func->num, addr,
incr_addr, buf, 1, size); incr_addr, buf, 0, size);
if (ret) if (ret)
return ret; return ret;

14
drivers/mmc/core/sdio_ops.c
View File

@ -128,8 +128,6 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
BUG_ON(!card); BUG_ON(!card);
BUG_ON(fn > 7); BUG_ON(fn > 7);
BUG_ON(blocks == 1 && blksz > 512);
WARN_ON(blocks == 0);
WARN_ON(blksz == 0); WARN_ON(blksz == 0);
/* sanity check */ /* sanity check */
@ -144,22 +142,20 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
cmd.arg |= fn << 28; cmd.arg |= fn << 28;
cmd.arg |= incr_addr ? 0x04000000 : 0x00000000; cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
cmd.arg |= addr << 9; cmd.arg |= addr << 9;
if (blocks == 1 && blksz < 512) if (blocks == 0)
cmd.arg |= blksz; /* byte mode */ cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */
else if (blocks == 1 && blksz == 512 &&
!(mmc_card_broken_byte_mode_512(card)))
cmd.arg |= 0; /* byte mode, 0==512 */
else else
cmd.arg |= 0x08000000 | blocks; /* block mode */ cmd.arg |= 0x08000000 | blocks; /* block mode */
cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC; cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
data.blksz = blksz; data.blksz = blksz;
data.blocks = blocks; /* Code in host drivers/fwk assumes that "blocks" always is >=1 */
data.blocks = blocks ? blocks : 1;
data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ; data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
data.sg = &sg; data.sg = &sg;
data.sg_len = 1; data.sg_len = 1;
sg_init_one(&sg, buf, blksz * blocks); sg_init_one(&sg, buf, data.blksz * data.blocks);
mmc_set_data_timeout(&data, card); mmc_set_data_timeout(&data, card);