linux-kernel - Re: [PATCH v8 09/34] dt-bindings: host1x: Document Memory Client resets of Host1x, GR2D and GR3D

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Date:   Wed, 18 Aug 2021 05:07:19 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Peter Chen <peter.chen@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Richard Weinberger <richard@....at>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Lucas Stach <dev@...xeye.de>, Stefan Agner <stefan@...er.ch>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-spi@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-mmc@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v8 09/34] dt-bindings: host1x: Document Memory Client
 resets of Host1x, GR2D and GR3D

18.08.2021 05:04, Dmitry Osipenko пишет:
> 18.08.2021 04:37, Dmitry Osipenko пишет:
>> 18.08.2021 04:16, Rob Herring пишет:
>>> On Tue, Aug 17, 2021 at 04:27:29AM +0300, Dmitry Osipenko wrote:
>>>> Memory Client should be blocked before hardware reset is asserted in order
>>>> to prevent memory corruption and hanging of memory controller.
>>>>
>>>> Document Memory Client resets of Host1x, GR2D and GR3D hardware units.
>>>>
>>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>>>> ---
>>>>  .../bindings/display/tegra/nvidia,tegra20-host1x.txt          | 4 ++++
>>>>  1 file changed, 4 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>>>> index 62861a8fb5c6..07a08653798b 100644
>>>> --- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>>>> +++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.txt
>>>> @@ -18,6 +18,7 @@ Required properties:
>>>>  - resets: Must contain an entry for each entry in reset-names.
>>>>    See ../reset/reset.txt for details.
>>>>  - reset-names: Must include the following entries:
>>>> +  - mc
>>>>    - host1x
>>>
>>> New entries should be at the end. Order matters.
>>
>> Indeed, order matters. In this case it matters by the hardware because
>> memory reset must be asserted before the controller's reset. We rely on
>> it in the code of the GENPD driver. Hence it's the intended order in
>> this patch.
>>
> 
> Although, my bad. It should be to reorder items here, it's not a GENPD
> binding.
> 

* should be fine

I'll change it in v9.