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 |
|---|---|---|
| Kconfig | -rw-r--r-- | 6.5 KB |
| Makefile | -rw-r--r-- | 1.7 KB |
| altera-cvp.c | -rw-r--r-- | 14.6 KB |
| altera-fpga2sdram.c | -rw-r--r-- | 4.9 KB |
| altera-freeze-bridge.c | -rw-r--r-- | 6.8 KB |
| altera-hps2fpga.c | -rw-r--r-- | 5.8 KB |
| altera-pr-ip-core-plat.c | -rw-r--r-- | 1.4 KB |
| altera-pr-ip-core.c | -rw-r--r-- | 5.0 KB |
| altera-ps-spi.c | -rw-r--r-- | 8.5 KB |
| dfl-afu-dma-region.c | -rw-r--r-- | 11.6 KB |
| dfl-afu-main.c | -rw-r--r-- | 14.5 KB |
| dfl-afu-region.c | -rw-r--r-- | 4.1 KB |
| dfl-afu.h | -rw-r--r-- | 2.9 KB |
| dfl-fme-br.c | -rw-r--r-- | 2.5 KB |
| dfl-fme-main.c | -rw-r--r-- | 6.3 KB |
| dfl-fme-mgr.c | -rw-r--r-- | 9.2 KB |
| dfl-fme-pr.c | -rw-r--r-- | 11.4 KB |
| dfl-fme-pr.h | -rw-r--r-- | 2.0 KB |
| dfl-fme-region.c | -rw-r--r-- | 2.1 KB |
| dfl-fme.h | -rw-r--r-- | 1.0 KB |
| dfl-pci.c | -rw-r--r-- | 6.1 KB |
| dfl.c | -rw-r--r-- | 25.8 KB |
| dfl.h | -rw-r--r-- | 12.1 KB |
| fpga-bridge.c | -rw-r--r-- | 12.3 KB |
| fpga-mgr.c | -rw-r--r-- | 19.2 KB |
| fpga-region.c | -rw-r--r-- | 8.5 KB |
| ice40-spi.c | -rw-r--r-- | 5.4 KB |
| machxo2-spi.c | -rw-r--r-- | 9.3 KB |
| of-fpga-region.c | -rw-r--r-- | 12.2 KB |
| socfpga-a10.c | -rw-r--r-- | 15.3 KB |
| socfpga.c | -rw-r--r-- | 17.0 KB |
| stratix10-soc.c | -rw-r--r-- | 12.4 KB |
| ts73xx-fpga.c | -rw-r--r-- | 4.3 KB |
| xilinx-pr-decoupler.c | -rw-r--r-- | 4.1 KB |
| xilinx-spi.c | -rw-r--r-- | 4.9 KB |
| zynq-fpga.c | -rw-r--r-- | 17.6 KB |
Computing file changes ...
