On 01/11/2021 09:07, Alper Nebi Yasak wrote:
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").
I'm also experiencing issue with the re-init of emmc on a 3399 platform, did you come to any conclusions on the reason? It works fine to load u-boot proper from SPL but then fails in u-boot proper when attempting to perform any mmc activity.
Regards, Jack.
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/sListing 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(+)