Subject: Re: [linux-sunxi] Re: [PATCH] mmc: sunxi: fix unusuable eMMC on some H6 boards by disabling DDR

From: Maxime Ripard <[email-masked]>
Date: Wed, 28 Aug 2019 15:43:34 +0200

On Wed, Aug 28, 2019 at 09:29:32PM +0800, Chen-Yu Tsai wrote:
> On Wed, Aug 28, 2019 at 8:52 PM Linus Walleij <[email-masked]> wrote:
> >
> > On Sun, Aug 25, 2019 at 5:06 PM Alejandro González
> > <[email-masked]> wrote:
> >
> > > Jernej Skrabec compared the BSP driver with this
> > > driver, and found that the BSP driver configures pinctrl to operate at
> > > 1.8 V when entering DDR mode (although 3.3 V operation is supported), while
> > > the mainline kernel lacks any mechanism to switch voltages dynamically.
>
> AFAIK The Pine H64 does not have the ability to switch I/O voltages. It is
> fixed to either 1.8V (the default based on the schematics) or 3.3V.

Should that be handled at the board level then maybe?

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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