Revision 5ea47691bd99e1100707ec63364aff72324e2af4 authored by Daniel Drake on 20 March 2019, 06:36:53 UTC, committed by Ulf Hansson on 21 March 2019, 10:19:06 UTC
Setting max_blk_count to 1 here was causing the mmc block layer
to always use the MMC_READ_SINGLE_BLOCK command here, which the
driver does not DMA-accelerate.
Drop the max_blk_ settings here. The mmc host defaults suffice,
along with the max_segs and max_seg_size settings, which I have
now documented in more detail.
Now each MMC command reads 4 512-byte blocks, using DMA instead of
PIO. On my SD card, this increases read performance (measured with dd)
from 167kb/sec to 4.6mb/sec.
Link: http://lkml.kernel.org/r/CAD8Lp47L5T3jnAjBiPs1cQ+yFA3L6LJtgFvMETnBrY63-Zdi2g@mail.gmail.com
Signed-off-by: Daniel Drake <drake@endlessm.com>
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>
Fixes: c5413ad815a6 ("mmc: add new Alcor Micro Cardreader SD/MMC driver")
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
1 parent 031d2cc
| File | Mode | Size |
|---|---|---|
| iscsi | ||
| loopback | ||
| sbp | ||
| tcm_fc | ||
| Kconfig | -rw-r--r-- | 1.4 KB |
| Makefile | -rw-r--r-- | 939 bytes |
| target_core_alua.c | -rw-r--r-- | 60.5 KB |
| target_core_alua.h | -rw-r--r-- | 6.0 KB |
| target_core_configfs.c | -rw-r--r-- | 92.2 KB |
| target_core_device.c | -rw-r--r-- | 31.9 KB |
| target_core_fabric_configfs.c | -rw-r--r-- | 27.7 KB |
| target_core_fabric_lib.c | -rw-r--r-- | 11.7 KB |
| target_core_file.c | -rw-r--r-- | 25.0 KB |
| target_core_file.h | -rw-r--r-- | 1.2 KB |
| target_core_hba.c | -rw-r--r-- | 4.7 KB |
| target_core_iblock.c | -rw-r--r-- | 22.0 KB |
| target_core_iblock.h | -rw-r--r-- | 623 bytes |
| target_core_internal.h | -rw-r--r-- | 6.7 KB |
| target_core_pr.c | -rw-r--r-- | 122.7 KB |
| target_core_pr.h | -rw-r--r-- | 2.4 KB |
| target_core_pscsi.c | -rw-r--r-- | 28.1 KB |
| target_core_pscsi.h | -rw-r--r-- | 1.3 KB |
| target_core_rd.c | -rw-r--r-- | 16.4 KB |
| target_core_rd.h | -rw-r--r-- | 1.5 KB |
| target_core_sbc.c | -rw-r--r-- | 37.9 KB |
| target_core_spc.c | -rw-r--r-- | 38.8 KB |
| target_core_stat.c | -rw-r--r-- | 37.1 KB |
| target_core_tmr.c | -rw-r--r-- | 12.0 KB |
| target_core_tpg.c | -rw-r--r-- | 18.0 KB |
| target_core_transport.c | -rw-r--r-- | 92.0 KB |
| target_core_ua.c | -rw-r--r-- | 8.9 KB |
| target_core_ua.h | -rw-r--r-- | 1.7 KB |
| target_core_user.c | -rw-r--r-- | 69.1 KB |
| target_core_xcopy.c | -rw-r--r-- | 30.4 KB |
| target_core_xcopy.h | -rw-r--r-- | 1.9 KB |
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