linux-kernel - Re: [PATCH] ARM: dts: sunxi: Explicitly enable pull-ups for MMC pins

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Date:   Thu, 17 Nov 2016 21:40:43 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Klaus Goger <klaus.goger@...obroma-systems.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH] ARM: dts: sunxi: Explicitly enable pull-ups for MMC pins

On Thu, Nov 17, 2016 at 05:34:38PM +0800, Chen-Yu Tsai wrote:
> In the past, all the MMC pins had
> 
> 	allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> 
> which was actually a no-op. We were relying on U-boot to set the bias
> pull up for us. These properties were removed as part of the fix up to
> actually support no bias on the pins. During the transition some boards
> experienced regular MMC time-outs during normal operation, while others
> completely failed to initialize the SD card.
> 
> Given that MMC starts in open-drain mode and the pull-ups are required,
> it's best to enable it for all the pin settings.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

Applied, thanks.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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