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

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Date:   Thu, 29 Aug 2019 13:37:14 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Alejandro González 
        <alejandro.gonzalez.correo@...il.com>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH] mmc: sunxi: fix unusuable eMMC on some H6 boards by
 disabling DDR

On Wed, 28 Aug 2019 at 12:52, Alejandro González
<alejandro.gonzalez.correo@...il.com> wrote:
>
> El 27/8/19 a las 15:24, Ulf Hansson escribió:> Assuming this should go stable as well? Perhaps you can find a
> > relevant commit that we can put as a fixes tag as well?
> >
> > Kind regards
> > Uffe
>
> The most relevant commit I've found that is related to enabling DDR speeds
> on H6 boards is this one: https://github.com/torvalds/linux/commit/07bafc1e3536a4e3c422dbd13341688b54f159bb .
> But it doesn't address the H6 SoC specifically, so I doubted whether it would
> be appropiate to mark this patch as fixing it, and opted to not do it. I don't
> mind adding that tag if it's appropiate, though :-)

Hard to say what makes sense here, but how about picking this below instead?

Fixes: 0a23f1ad88fc ("dt-binding: mmc: sunxi: add H6 compatible (with
A64 fallback)")

>
> On the other hand, I'm not sure that I understood correctly what do you mean by
> this patch going stable, but I might say the changes themselves are stable and work.
> The only downside I can think of to them is that they are a kind of workaround that
> reduces performance on H6 boards and/or eMMC not affected by this problem (are there
> any?), unless device trees are changed.

Adding a stable tag and a fixes tag for the commit, makes maintainers
of stable kernels to try to backport this commit and fix the problem
for "older" kernels.

Kind regards
Uffe