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Date: Mon, 17 Oct 2016 13:46:03 -0700
From: Olof Johansson <olof@lixom.net>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: arm@kernel.org, linux-arm-kernel@lists.infradead.org,
        daniel.lezcano@linaro.org, stable@vger.kernel.org,
        Ulf Hansson <ulf.hansson@linaro.org>
Subject: Re: [PATCH] ARM: dts: fix the SD card on the Snowball
Message-ID: <20161017204603.GA3264@localhost>
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On Fri, Oct 07, 2016 at 10:52:17AM +0200, Linus Walleij wrote:
> This fixes a very annoying regression on the Snowball SD card
> that has been around for a while. It turns out that the device
> tree does not configure the direction pins properly, nor sets
> up the pins for the voltage converter properly at boot. Unless
> all things are correctly set up, the feedback clock will not
> work, and makes the driver spew messages in the console (but
> it works, very slowly):
> 
> root@Ux500:/ mount /dev/mmcblk0p2 /mnt/
> [    9.953460] mmci-pl18x 80126000.sdi0_per1: error during DMA transfer!
> [    9.960296] mmcblk0: error -110 sending status command, retrying
> [    9.966461] mmcblk0: error -110 sending status command, retrying
> [    9.972534] mmcblk0: error -110 sending status command, aborting
> 
> Fix this by rectifying the device tree to correspond to that of
> the Ux500 HREF boards plus the DAT31DIR setting that is unique for
> the Snowball, and things start working smoothly. Add in the SDR12
> and SDR25 modes which this host can do without any problems.
> 
> I don't know if this has ever been correct, sadly. It works after
> this patch.
> 
> Cc: stable@vger.kernel.org
> Reported-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> Cc: Ulf Hansson <ulf.hansson@linaro.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> ARM SoC folks: please apply this directly for fixes.

Applied, thanks.


-Olof