[PATCH 0/3] Support SDMA mode on RPI4 target - 32bit
Jaehoon Chung
jh80.chung at samsung.com
Thu Jan 23 00:15:01 CET 2020
RPI4's SDHCI controller is supported SDMA mode. (Checked on kernel side)
But It doesn't use on u-boot side. Then it's too slow about read/write performance.
This patchset is supported SDMA mode on RPI4 target(32bit).
- I didn't test on RPI4 64bit.
Read/write time about 8MB file
Before
- Read : 1.472 seconds
- Write : 4.690 seconds
After
- Read : 0.359 seconds
- Write : 0.574 seconds
This patch is based on my RFC's patches.
Jaehoon Chung (3):
mmc: sdhci: use phys2bus macro when dma address is accessed
mmc: sdhci: not return error when SDMA is not supported
configs: rpi_4_32b_defconfig: enable SDHCI_SDMA config
configs/rpi_4_32b_defconfig | 1 +
drivers/mmc/sdhci.c | 16 +++++++++-------
2 files changed, 10 insertions(+), 7 deletions(-)
--
2.25.0
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