[PATCH v1 0/3] mmc: dw_mmc-rockchip: Add stability quirk for NanoPi R76S

[Marco Schirrmeister]

On Mon, Jan 12, 2026 at 9:58 AM Shawn Lin <shawn.lin at rock-chips.com> wrote:

> >> I found several problems on RK3576 for supporting sd cards. I wondered
> >> how all upstream RK3576 boards claiming SD support work? Anyway, I sent
> >> a series to the list[1], not sure if it fixes the problem you faced, but
> >> these should be the right patches you should have a try.
> >>
> >> [1]https://lore.kernel.org/linux-rockchip/1768189768-96333-1-git-send-email-shawn.lin@rock-chips.com/T/#t

I will give it a try on the NanoPi R76S. Have also ordered a Rock 4D.
But it will take a while before it arrives.

> > cannot be detected. However, if the SD card is inserted before Linux
> > boots, it can at least start up. I suspect that other boards may behave
> > the same way :)
>
> This is true, because .get_cd() returns card present when booting for
> the first time, you the only way for upstream RK3576 boards to use sd
> cards is to insert the card before booting. But then hot-plug case will
> not able to work.

I can confirm the same. sd card only works, when inserted before boot.
No hotplug.