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mmc: support packed write command for eMMC4.5 devices

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This patch supports packed write command of eMMC4.5 devices.  Several
writes can be grouped in packed command and all data of the individual
commands can be sent in a single transfer on the bus. Large amounts of
data in one transfer rather than several data of small size are
effective for eMMC write internally.  As a result, packed command help
write throughput be improved.  The following tables show the results
of packed write.

Type A:
test     none |  packed
iozone   25.8 |  31
tiotest  27.6 |  31.2
lmdd     31.2 |  35.4

Type B:
test     none |  packed
iozone   44.1 |  51.1
tiotest  47.9 |  52.5
lmdd     51.6 |  59.2

Type C:
test     none |  packed
iozone   19.5 |  32
tiotest  19.9 |  34.5
lmdd     22.8 |  40.7

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Maya Erez <merez@codeaurora.org>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Seungwon Jeon 2013-02-06 17:02:46 +09:00 • committed by Chris Ball
parent abd9ac1449
commit ce39f9d17c
7 changed files with 571 additions and 17 deletions
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5
include/linux/mmc/card.h
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@ -310,6 +310,11 @@ static inline void mmc_part_add(struct mmc_card *card, unsigned int size,
card->nr_parts++;
}
static inline bool mmc_large_sector(struct mmc_card *card)
{
return card->ext_csd.data_sector_size == 4096;
}
/*
* The world is not perfect and supplies us with broken mmc/sdio devices.
* For at least some of these bugs we need a work-around.