linux-kernel - Re: [PATCH v5 4/8] drm/imagination: Use pwrseq for TH1520 GPU power management

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Message-ID: <CAMRc=Mcv6KJOCypOHF-KtFk6N-Z=eoMCqH0KuuUND=8J1YvrEw@mail.gmail.com>
Date: Wed, 18 Jun 2025 15:42:23 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Michal Wilczynski <m.wilczynski@...sung.com>
Cc: Drew Fustini <drew@...7.com>, Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Frank Binns <frank.binns@...tec.com>, 
	Matt Coster <matt.coster@...tec.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
	Ulf Hansson <ulf.hansson@...aro.org>, Marek Szyprowski <m.szyprowski@...sung.com>, 
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v5 4/8] drm/imagination: Use pwrseq for TH1520 GPU power management

On Wed, Jun 18, 2025 at 12:22 PM Michal Wilczynski
<m.wilczynski@...sung.com> wrote:
>
> Update the Imagination PVR DRM driver to leverage the pwrseq framework
> for managing the power sequence of the GPU on the T-HEAD TH1520 SoC.
>
> To cleanly handle the TH1520's specific power requirements in the
> generic driver, this patch implements the "driver match data" pattern.
> The pvr_soc_data struct, associated with a compatible string in the
> of_device_id table, now holds pointers to platform-specific power_on and
> power_off functions.
>
> At probe time, the driver inspects the assigned power_on function
> pointer. If it points to the pwrseq variant, the driver calls
> devm_pwrseq_get("gpu-power"), requiring a valid sequencer and deferring
> probe on failure. Otherwise, it falls back to its standard manual reset
> initialization.
>
> The runtime PM callbacks, pvr_power_device_resume() and
> pvr_power_device_suspend(), call the power_on and power_off function
> pointers. Helper functions for both manual and pwrseq-based sequences
> are introduced to support this.
>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
> ---

IMO it's much better this way, thanks.

Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>