Hi,
On 11/1/21 6:07 PM, 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"). 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
I wonder why HS400ES is lower than High Speed mode in 256MiB Load Speed.
Best Regards, Jaehoon Chung
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(+)