linux-kernel - Re: [PATCH v3 0/7] Fix RK3588 GPU domain

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Message-ID: <CAPDyKFoAv1jeQitHmTMhvwG9vGzN-vLby0fPzkX1E6+-Qe2dog@mail.gmail.com>
Date: Wed, 23 Oct 2024 12:05:51 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Mark Brown <broonie@...nel.org>, Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, 
	Liam Girdwood <lgirdwood@...il.com>, Elaine Zhang <zhangqing@...k-chips.com>, 
	Adrián Martínez Larumbe <adrian.larumbe@...labora.com>, 
	Boris Brezillon <boris.brezillon@...labora.com>, Chen-Yu Tsai <wens@...e.org>, 
	devicetree@...r.kernel.org, linux-rockchip@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH v3 0/7] Fix RK3588 GPU domain

On Tue, 22 Oct 2024 at 17:45, Sebastian Reichel
<sebastian.reichel@...labora.com> wrote:
>
> Hi,
>
> I got a report, that the Linux kernel crashes on Rock 5B when the panthor
> driver is loaded late after booting. The crash starts with the following
> shortened error print:
>
> rockchip-pm-domain fd8d8000.power-management:power-controller: failed to set domain 'gpu', val=0
> rockchip-pm-domain fd8d8000.power-management:power-controller: failed to get ack on domain 'gpu', val=0xa9fff
> SError Interrupt on CPU4, code 0x00000000be000411 -- SError
>
> This series first does some cleanups in the Rockchip power domain
> driver and changes the driver, so that it no longer tries to continue
> when it fails to enable a domain. This gets rid of the SError interrupt
> and long backtraces. But the kernel still hangs when it fails to enable
> a power domain. I have not done further analysis to check if that can
> be avoided.
>
> Last but not least this provides a fix for the GPU power domain failing
> to get enabled - after some testing from my side it seems to require the
> GPU voltage supply to be enabled.
>
> This series is now based on the pull request from Mark Brown:
> https://lore.kernel.org/linux-pm/ZvsVfQ1fuSVZpF6A@finisterre.sirena.org.uk/
>
> I added one more patch, which adds devm_of_regulator_get without the
> _optional suffix, since that is more sensible for the Rockchip usecase.
> Longer explanation can be seen in patch 6, which adds the handling to
> the Rockchip driver. My merge suggestion would be that Mark adds the
> regulator patch on top of the immutable branch and creates a new pull
> request.

The merge strategy seems reasonable to me. But I am fine with that
whatever works for Mark.

[...]

Kind regards
Uffe