linux-kernel - Re: [PATCH] mmc: tegra: fix SDR50 tuning override

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Date:   Mon, 6 Jan 2020 13:07:18 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Lucas Stach <dev@...xeye.de>, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: tegra: fix SDR50 tuning override

On Thu, Jan 02, 2020 at 11:30:50AM +0100, Michał Mirosław wrote:
> Commit 7ad2ed1dfcbe inadvertently mixed up a quirk flag's name and
> broke SDR50 tuning override. Use correct NVQUIRK_ name.
> 
> Fixes: 7ad2ed1dfcbe ("mmc: tegra: enable UHS-I modes")
> Depends-on: 4f6aa3264af4 ("mmc: tegra: Only advertise UHS modes if IO regulator is present")
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
>  drivers/mmc/host/sdhci-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Oh my... good catch!

Reviewed-by: Thierry Reding <treding@...dia.com>

I also ran this through our internal test system and all tests pass, so
also:

Tested-by: Thierry Reding <treding@...dia.com>

I'm not sure if that "Depends-on:" tag is anything that's recognized
anywhere. It might be better to turn that into an additional "Fixes:"
line. Adding Greg to see if he has a standard way of dealing with this
kind of dependency.

Greg, what's your preferred way to handle these situations? I think the
intention here was to describe that the original error was introduced by
commit 7ad2ed1dfcbe ("mmc: tegra: enable UHS-I modes"), but then commit
4f6aa3264af4 ("mmc: tegra: Only advertise UHS modes if IO regulator is
present") moved that code around, so this patch here will only be back-
portable until the latter commit, but should be backported until the
former.

I'm not sure it matters in this case because the latter went into v4.5
and the former went into v4.8, so we don't need this in v4.4 and v4.9
should already have all the prerequisites for this. But in general, do
you need anything special to model such dependencies, or is this simply
solved by requiring a manual backport if the fix stops applying cleanly
at some point?

Thierry

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