[PATCH 1/2] mmc: sdhci: set bus voltage before enabling bus power

[Ludovic Desroches]

On Tue, Nov 24, 2015 at 12:01:53PM +0100, Ulf Hansson wrote:
> On 24 November 2015 at 10:23, Ludovic Desroches
> <ludovic.desroches at atmel.com> wrote:
> > Hi Ulf,
> >
> > On Mon, Nov 09, 2015 at 05:30:26PM +0100, Ludovic Desroches wrote:
> >> On Mon, Nov 09, 2015 at 05:00:46PM +0100, Ulf Hansson wrote:
> >
> > [...]
> >
> >> > Now, this discussion was interesting, but I forgot what problem you
> >> > actually where trying to solve? :-)
> >>
> >> There is this discussion because of two things:
> >> - Fixing something I consider as a bug: when I have a VMMC, only
> >>   setting/clearing bit 0. Our controller strictly obeys to the spec and
> >>   check the 'SD Bus Voltage Select' field. Since we put a reserved value
> >>   (000), the Power On is not performed.
> >> - I was trying to get help to understand what is this 'SD Bus Voltage'.
> >>   For our controller and sdhci_set_power(), it seems to stand for VMMC.
> >>   For me, everything concerning bus voltage is related to VQMMC, so I was
> >>   disappointed.
> >
> > Do you plan to take the patch for VMMC? If yes, I will send a new patch
> > for the device tree (I'll only add vmmc, not vqmmc as discussed); if
> > not, forget these two patches.
> >
> 
> Which patch do you refer to for "VMMC"?
> 

This one to not write an invalid voltage in the power control register
even if we have an external regulator for vmmc.

Regards

Ludovic