On Wed, May 8, 2019 at 7:22 PM Robin Murphy <robin.murphy@xxxxxxx> wrote:
>
> On 08/05/2019 06:41, Jagan Teki wrote:
> > sdmmc cd pin is configured as RK_FUNC_GPIO which is wrong and
> > indeed failed to detect the sdcard on the board with below error
> >
> > Card did not respond to voltage select!
> >
> > So, fix it by replacing RK_FUNC_GPIO with RK_FUNC_1 which
> > is already defined in rk3399.dts so make use of same like
> > other boards.
>
> AFAICS this should also be true of RockPro64 and (at least with the
> Linux DT) Firefly - those aren't grabbing &sdmmc_cd by default either. I
> imagine that U-Boot might also see similar problems on Gru, where the
> card detect signal is on a completely different GPIO.
But RockPro64 is not using sdmmc_cd and it is able to detect the card
w/o pin but it has cd-gpio.
>
> I'd note that in Linux, only rk3399-evb is actually *using* &sdmmc_cd -
> despite the fact that they claim it, nearly all the other boards also
> have "cd-gpios" and thus end up overriding the dedicated function with
> an implicit GPIO configuration anyway. Sapphire is the odd one out in
> using "broken-cd" as the less-efficient way of mitigating the runtime PM
> issue.
>
> > Add these changes in -u-boot.dtsi to make Linux sync easy for future
> > changes.
> >
> > Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
> > Reviewed-by: Kever Yang <kever.yang@xxxxxxxxxxxxxx>
> > ---
> > arch/arm/dts/rk3399-nanopi4-u-boot.dtsi | 9 +++++++++
> > 1 file changed, 9 insertions(+)
> > create mode 100644 arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
> >
> > diff --git a/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi b/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
> > new file mode 100644
> > index 0000000000..20db99c0b8
> > --- /dev/null
> > +++ b/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
> > @@ -0,0 +1,9 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2019 Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
> > + */
> > +
> > +&sdmmc {
> > + pinctrl-names = "default";
>
> That's already set in the base DTSI, so doesn't really need to be
> shadowed here.
>
> > + pinctrl-0 = <&sdmmc_bus4 &sdmmc_clk &sdmmc_cmd &sdmmc_cd>;
> > +};
> >
>
> I suppose you could also delete the "cd-gpios" property to make it
> really clear what this override is for (and save a few bytes if it's
> going to be ignored anyway).
Why so? few boards like OrangePI do use both sdmmc_cd along with cd-gpio.
On the other-hand, how about doing this change in Linux?
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