linux-kernel - Re: [PATCH v1 1/3] ARM: tegra: Initialize r0 register for firmware wake-up

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Date:   Wed, 6 May 2020 18:34:00 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Jasper Korten <jja2000@...il.com>,
        David Heidelberg <david@...t.cz>,
        Peter Geis <pgwipeout@...il.com>, linux-pm@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/3] ARM: tegra: Initialize r0 register for firmware
 wake-up

On Wed, Mar 25, 2020 at 01:43:33AM +0300, Dmitry Osipenko wrote:
> Downstream kernel of ASUS TF300T sets r0 to #3. There is no explanation in
> downstream code whether this is really needed and some of T30 downstream
> kernels have and explicit comment telling that all arguments are ignored
> by firmware. Let's take a safe side by replicating behavior of the TF300T
> downstream kernel. This change works fine on Ouya and Nexus 7 devices.
> 
> Tested-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> Tested-by: Jasper Korten <jja2000@...il.com>
> Tested-by: David Heidelberg <david@...t.cz>
> Tested-by: Peter Geis <pgwipeout@...il.com>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  arch/arm/mach-tegra/reset-handler.S | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)

Applied to for-5.8/arm/core, thanks.

Thierry

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