Re: [PATCH] ARM: dts: add rk3288-firefly-reload

[Shawn Lin]

å 2016/8/7 22:44, Heiko Stuebner åé:
> Hi Shawn,
>
> Am Sonntag, 7. August 2016, 11:40:21 schrieb Shawn Lin:
> > On 2016/7/19 3:46, Heiko StÃbner wrote:
> > > Am Montag, 18. Juli 2016, 23:32:32 schrieb Randy Li:
> > > > The Firefly RK3288 Reload is a combination Firefly rk3288 core board
> > > > with the Reload baseboard. Add a dtsi for the Firefly rk3288 core
> > > > which can be included into the dts for the various baseboards
> > > > in the future and dts for Reload base board.
> > > >
> > > > Currently supported are serial console, wired networking, eMMC and
> > > > SD storage, SPFIF, IR receiver, LEDs, SDIO wifi and USB. But only
> > > > the OTG could work on the host mode now, the other USB host can't
> > > > work now, additional patches are required.
> > > >
> > > > Signed-off-by: Randy Li <ayaka@xxxxxxxxxxx>
> > > > Acked-by: Rob Herring <robh@xxxxxxxxxx>
> > >
> > > applied [0], after some minor reordering - please double check.
> > >
> > > Also, while the branch is named 4.8 this will only go into 4.9, as the
> > > merge- window supposedly opens on the weekend.
> >
> > Sorry for the noise here:), but I find there is some mmc stuff
> > which confuse me. Maybe Randy could elaborate more?
> >
> > Your sdmmc claims to support UHS-I mode like sd-uhs-sdr104, etc, which
> > will ask dw_mmc to switch vqmmc from 3V3 to 1V8 after sending CMD11.
> >
> > But the vqmmc is vccio_sd which is fixed as 3V3? :)
>
> so far we have only been able to achieve UHS speeds on devices based on the
> rk808 pmic (I had sucess on veyron and popmetal). The act8846-based boards
> seem to have some issue when trying to do the switch to 1.8V, resulting in
> mmc errors and the mmc-core switching back to 3.3V.

Interesting.... I will have a look at it this weekend with Randy face 2
face....

> I think this might be caused by a bug in the act8846 driver or some dts
> mistake. But so far nobody had the time and enthusiasm to investigate :-)
>
>
> Heiko
>
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--
Best Regards
Shawn Lin