[U-Boot] [BISECTED] [BUG]: MMC initialization hang at Zynq Z-turn board

[Peng Fan]

> Subject: [BISECTED] [BUG]: MMC initialization hang at Zynq Z-turn board
> 
> Hello,
> 
> I am running Zynq Z-turn board and I face the following issue with MMC
> initialization in SPL.
> With u-boot master, I see the message similar to the following:
> 
> U-Boot SPL 2019.07-00352-gb5f3eb3393 (Jul 31 2019 - 20:03:42 +0300) mmc
> boot Trying to boot from MMC1
> 
> Then, the u-boot waits forever. I've tried to add debug prints and found that
> execution is stalled somewhere inside mmc_init().
> Using bisect I've found that the following broken commit is the following:

https://gitlab.denx.de/u-boot/custodians/u-boot-mmc/commit/41a9fab8dac841afb70a059668abaf14d47cdf59

Would this patch help?

Regards,
Peng.

> 
> commit 3d296365e4e8823c7c0d4b568fa7accfae4bf895 (refs/bisect/bad)
> Author: Faiz Abbas <faiz_abbas at ti.com>
> Date:   Tue Jun 11 00:43:34 2019 +0530
> 
>     mmc: sdhci: Add support for sdhci-caps-mask
> 
>     Add Support for masking some bits in the capabilities
>     register of a host controller.
> 
>     Also remove the redundant readl() into caps1.
> 
>     Signed-off-by: Faiz Abbas <faiz_abbas at ti.com>
>     Reviewed-by: Tom Rini <trini at konsulko.com>
> 
> Until that commit the behavior was the following:
> 
> U-Boot SPL 2019.07-00351-g889a4dfc55 (Jul 31 2019 - 20:01:41 +0300) mmc
> boot Trying to boot from MMC1
> spl_load_image_fat_os: error reading image system.dtb, err - -2
> spl_load_image_fat: error reading image u-boot.img, err - -2
> SPL: failed to boot from all boot devices ### ERROR ### Please RESET the
> board ###
> 
> There were no u-boot.img at the SD card while testing, so this error message
> is expected here.
> 5456935a1da3 ("ARM: zynq: Add configuration for Z-turn board") was applied
> at the top of every testing commit to allow the board initialization in SPL.
> 
> What could be wrong with that commit and how could I fix the board?
> 
> --
> With best regards,
> Matwey V. Kornilov