I'm trying to make my gru-kevin's eMMC work properly (it times out while
tuning for HS400 and stops working when reinitialized via "mmc dev 0").
While experimenting with what works on my board I ended up implementing
HS400ES support. And while I'm at it, I decided to do it for RK3568 as
well since it turned out easy enough. Both are ported from relevant
Linux drivers.
I'm trying this with "load mmc 0:1 0xd0000000 /bigfile $size" and getting
the following speeds; and with "mmc info" the following differences:
gru-kevin mmc0 | w/o this series | w/ this series
--------------------+---------------------------+-------------------
Bus Speed | 52000000 | 200000000
Mode | MMC High Speed (52MHz) | HS400ES (200 MHz)
8MiB Load Speed | ~9.5 MiB/s | ~51.5 MiB/s
256MiB Load Speed | ~177.8 MiB/s | ~114.5 MiB/s
Listing partitions, listing files, reading files and the loaded bytes
all look fine to me, but I'm not sure I haven't missed anything.
Alper Nebi Yasak (3):
mmc: sdhci: Add HS400 Enhanced Strobe support
rockchip: sdhci: Add HS400 Enhanced Strobe support for RK3399
rockchip: sdhci: Add HS400 Enhanced Strobe support for RK3568
drivers/mmc/rockchip_sdhci.c | 51 ++++++++++++++++++++++++++++++++++++
drivers/mmc/sdhci.c | 18 +++++++++++++
include/sdhci.h | 1 +
3 files changed, 70 insertions(+)
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2.33.1
