From: Maxime Ripard <mripard@kernel.org>
To: Chen-Yu Tsai <wens@csie.org>
Cc: "Ulf Hansson" <ulf.hansson@linaro.org>,
"Alejandro González" <alejandro.gonzalez.correo@gmail.com>,
"Greg KH" <gregkh@linuxfoundation.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
linux-mmc <linux-mmc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-sunxi <linux-sunxi@googlegroups.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>
Subject: Re: [linux-sunxi] Re: [PATCH] mmc: sunxi: fix unusuable eMMC on some H6 boards by disabling DDR
Date: Wed, 28 Aug 2019 15:43:34 +0200 [thread overview]
Message-ID: <20190828134334.qzuwodoxmw7ov5yg@flea> (raw)
In-Reply-To: <CAGb2v67e8EiS-LUuhAyPc57nWd4iOBEWC_SZbH801Lzi4QWGyg@mail.gmail.com>
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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 <linus.walleij@linaro.org> wrote:
> >
> > On Sun, Aug 25, 2019 at 5:06 PM Alejandro González
> > <alejandro.gonzalez.correo@gmail.com> 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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next prev parent reply other threads:[~2019-08-28 13:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-25 15:05 [PATCH] mmc: sunxi: fix unusuable eMMC on some H6 boards by disabling DDR Alejandro González
2019-08-27 13:24 ` Ulf Hansson
2019-08-28 10:52 ` Alejandro González
2019-08-29 11:37 ` Ulf Hansson
2019-08-27 13:32 ` Maxime Ripard
2019-08-28 12:52 ` Linus Walleij
2019-08-28 13:29 ` [linux-sunxi] " Chen-Yu Tsai
2019-08-28 13:43 ` Maxime Ripard [this message]
2019-08-28 13:46 ` Chen-Yu Tsai
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