[PATCH 0/3] rockchip: sdhci: Add HS400 Enhanced Strobe support

[Jack Mitchell]

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/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(+)
> 

-- 
Jack Mitchell, Consultant
https://www.tuxable.co.uk