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.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
Changelog on V3
- Rebased on latest u-boot-mmc
Changelog on V2
- Keep printf message instead of debug
- Add Peng's Reviewed-by tag
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 | 13 +++++++------
2 files changed, 8 insertions(+), 6 deletions(-)