[RFC 0/4] Support SDMA mode on RPI4 target - 32bit

[Jaehoon Chung]

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

Jaehoon Chung (4):
  mmc: bcm2835_sdhci: use phys2bus macro when dma address is accessed
  mmc: sdhci: add quriks relevant to broken SDMA
  mmc: bcm2835_sdhci: set SDHCI_QUIRK_BROKEN_SDMA flag
  configs: rpi_4_32b_defconfig: enable SDHCI_SDMA config

 configs/rpi_4_32b_defconfig |  1 +
 drivers/mmc/bcm2835_sdhci.c | 10 ++++++++--
 drivers/mmc/sdhci.c         | 10 ++++++++--
 include/sdhci.h             |  1 +
 4 files changed, 18 insertions(+), 4 deletions(-)

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2.25.0