diff options
| author | Seungwon Jeon <tgih.jun@samsung.com> | 2013-02-06 17:02:46 +0900 |
|---|---|---|
| committer | Riham Haidar <rhaidar@nvidia.com> | 2013-03-13 16:27:42 -0700 |
| commit | d35834bbe7dc88c43adff02faf2f28de8433a3ad (patch) | |
| tree | 9430158c8fb34a668b637dea64a8f9ec2a73613a /drivers/mmc/core | |
| parent | 4e8a1b26c07dfab8c49f39a8a7c1efd1c94ff6a4 (diff) | |
mmc: support packed write command for eMMC4.5 devices
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>
(cherry picked from commit ce39f9d17c14e56ea6772aa84393e6e0cc8499c4)
Bug 1242730
Change-Id: I634389c3daefe7f10c3f8ef0a373f7520923e6c1
Signed-off-by: Naveen Kumar Arepalli <naveenk@nvidia.com>
Reviewed-on: http://git-master/r/206219
Reviewed-by: Riham Haidar <rhaidar@nvidia.com>
Tested-by: Riham Haidar <rhaidar@nvidia.com>
Diffstat (limited to 'drivers/mmc/core')
| -rw-r--r-- | drivers/mmc/core/mmc_ops.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index ea9076608b8c..7a899ccb04f1 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -335,6 +335,7 @@ int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd) return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd, 512); } +EXPORT_SYMBOL_GPL(mmc_send_ext_csd); int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp) { |