linux-kernel - Re: [PATCH] drm/panthor: attach the driver's multiple power domains

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Message-ID: <20251009160929.1b36b9ea@fedora>
Date: Thu, 9 Oct 2025 16:09:29 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Rain Yang <jiyu.yang@....nxp.com>
Cc: imx@...ts.linux.dev, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, steven.price@....com, liviu.dudau@....com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.com, simona@...ll.ch, Rain Yang <jiyu.yang@....com>, Prabhu
 Sundararaj <prabhu.sundararaj@....com>
Subject: Re: [PATCH] drm/panthor: attach the driver's multiple power domains

On Thu, 9 Oct 2025 16:08:20 +0200
Boris Brezillon <boris.brezillon@...labora.com> wrote:

> On Thu,  9 Oct 2025 22:00:39 +0800
> Rain Yang <jiyu.yang@....nxp.com> wrote:
> 
> > From: Rain Yang <jiyu.yang@....com>
> > 
> > Some platforms, such as i.MX95, utilize multiple power domains that need
> > to be attached explicitly. This patch ensures that the driver properly
> > attaches all available power domains using devm_pm_domain_attach_list().
> > 
> > Signed-off-by: Prabhu Sundararaj <prabhu.sundararaj@....com>
> > Signed-off-by: Rain Yang <jiyu.yang@....com>
> > ---
> >  drivers/gpu/drm/panthor/panthor_device.c | 6 ++++++
> >  drivers/gpu/drm/panthor/panthor_device.h | 2 ++
> >  2 files changed, 8 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c
> > index f0b2da5b2b96..6f40d053b16c 100644
> > --- a/drivers/gpu/drm/panthor/panthor_device.c
> > +++ b/drivers/gpu/drm/panthor/panthor_device.c
> > @@ -218,6 +218,12 @@ int panthor_device_init(struct panthor_device *ptdev)
> >  	if (ret)
> >  		return ret;
> >  
> > +	ret = devm_pm_domain_attach_list(ptdev->base.dev, NULL, &ptdev->pd_list);
> > +	if (ret < 0) {
> > +		drm_err(&ptdev->base, "attach power domains failed, ret=%d", ret);
> > +		return ret;
> > +	}
> > +
> >  	ret = panthor_devfreq_init(ptdev);
> >  	if (ret)
> >  		return ret;
> > diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
> > index 4fc7cf2aeed5..5ecb541ec67b 100644
> > --- a/drivers/gpu/drm/panthor/panthor_device.h
> > +++ b/drivers/gpu/drm/panthor/panthor_device.h
> > @@ -196,6 +196,8 @@ struct panthor_device {
> >  		/** @recovery_needed: True when a resume attempt failed. */
> >  		atomic_t recovery_needed;
> >  	} pm;  
> 
> Add a blank line here.
> 
> > +	/** @pm: Power management related data. */

Also, the comment is wrong, and it would probably make sense to move
that to the pm sub-struct since this is PM related.

> > +	struct dev_pm_domain_list  *pd_list;
> >    
> 
> Do we even need to keep the pd_list in panthor_device if we don't do
> anything with it?
> 
> >  	/** @profile_mask: User-set profiling flags for job accounting. */
> >  	u32 profile_mask;  
>