[regression, bisected] no MMC on rk3399-gru-kevin with 5.10-rc1

[Ulf Hansson]

On Fri, 30 Oct 2020 at 23:04, Vicente Bergas <vicencb at gmail.com> wrote:
>
> Hi,
> commit 21b2cec61c04bd175f0860d9411a472d5a0e7ba1
> mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4
> broke booting rk3399-gru-kevin.
>
> The kernel waits forever for the root device to appear on MMC.

Waiting forever sounds weird to me.

> Removing the line containing PROBE_PREFER_ASYNCHRONOUS in
> drivers/mmc/host/dw_mmc-rockchip.c fixes the issue.

I am guessing when we enable async probe, we reveal some other
existing error. Or, perhaps the rootfs mount point become wrong?

Would it be possible to share a boot log (before/after) with some
driver probe debugging enabled?

Kind regards
Uffe