[PATCH v2 0/4] Add RZ/G3L GFX support

[PATCH v2 0/4] Add RZ/G3L GFX support

[Biju]

From: Biju Das <biju.das.jz@bp.renesas.com>

The Renesas RZ/G3L SoC includes the Arm Mali-G31 GPU as a 3D Graphics
Engine (GE3D). The Arm Mali-G31 GPU is a graphics acceleration platform
that is based on open standards. It supports 2D graphics, 3D graphics, and
General Purpose computing on GPU (GPGPU). Add the binding and driver
support for suspend/resume functionality along with some improvements in
panfrost driver.

v1->v2:
 * Dropped duplicate err assignment
 * Changed the format string of dev_err to "%d" and simplify the dev_err()
   line by using err rather than the same PTR_ERR().
 * Collected tags

Biju Das (4):
  dt-bindings: gpu: mali-bifrost: Add compatible for RZ/G3L SoC
  drm/panfrost: Drop redundant optional clock checks in runtime PM
  drm/panfrost: Add bus_ace optional clock support for RZ/G2L
  drm/panfrost: Add GPU_PM_RT support for RZ/G3L SoC

 .../bindings/gpu/arm,mali-bifrost.yaml        |  2 ++
 drivers/gpu/drm/panfrost/panfrost_device.c    | 34 ++++++++++++++-----
 drivers/gpu/drm/panfrost/panfrost_device.h    |  1 +
 drivers/gpu/drm/panfrost/panfrost_drv.c       |  1 +
 4 files changed, 30 insertions(+), 8 deletions(-)

-- 
2.43.0

[PATCH v2 1/4] dt-bindings: gpu: mali-bifrost: Add compatible for RZ/G3L SoC

[Biju]

From: Biju Das <biju.das.jz@bp.renesas.com>

Add a compatible string for the Renesas RZ/G3L SoC variants that include a
Mali-G31 GPU. These variants share the same restrictions on interrupts,
clocks, and power domains as the RZ/G2L SoC, so extend the existing schema
validation accordingly.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * Collected tag
---
 Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
index db49b8ff8c74..9db9f84ad964 100644
--- a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
+++ b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
@@ -26,6 +26,7 @@ properties:
               - realtek,rtd1619-mali
               - renesas,r9a07g044-mali
               - renesas,r9a07g054-mali
+              - renesas,r9a08g046-mali
               - renesas,r9a09g047-mali
               - renesas,r9a09g056-mali
               - renesas,r9a09g057-mali
@@ -150,6 +151,7 @@ allOf:
             enum:
               - renesas,r9a07g044-mali
               - renesas,r9a07g054-mali
+              - renesas,r9a08g046-mali
               - renesas,r9a09g047-mali
               - renesas,r9a09g056-mali
               - renesas,r9a09g057-mali
-- 
2.43.0

Re: [PATCH v2 1/4] dt-bindings: gpu: mali-bifrost: Add compatible for RZ/G3L SoC

[Geert Uytterhoeven]

On Fri, 20 Mar 2026 at 17:42, Biju <biju.das.au@gmail.com> wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> Add a compatible string for the Renesas RZ/G3L SoC variants that include a
> Mali-G31 GPU. These variants share the same restrictions on interrupts,
> clocks, and power domains as the RZ/G2L SoC, so extend the existing schema
> validation accordingly.
>
> Acked-by: Rob Herring (Arm) <robh@kernel.org>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Biju]

From: Biju Das <biju.das.jz@bp.renesas.com>

The clk_enable() and clk_disable() APIs already handle NULL clock pointers
gracefully — clk_enable() returns 0 and clk_disable() returns immediately
when passed a NULL or optional clock. The explicit if (pfdev->bus_clock)
guards around these calls in the runtime suspend/resume paths are
therefore unnecessary. Remove them to simplify the code.

Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * Collected tag
---
 drivers/gpu/drm/panfrost/panfrost_device.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index dedc13e56631..01e702a0b2f0 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
 		if (ret)
 			goto err_clk;
 
-		if (pfdev->bus_clock) {
-			ret = clk_enable(pfdev->bus_clock);
-			if (ret)
-				goto err_bus_clk;
-		}
+		ret = clk_enable(pfdev->bus_clock);
+		if (ret)
+			goto err_bus_clk;
 	}
 
 	panfrost_device_reset(pfdev, true);
@@ -464,9 +462,7 @@ static int panfrost_device_runtime_suspend(struct device *dev)
 	panfrost_gpu_power_off(pfdev);
 
 	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
-		if (pfdev->bus_clock)
-			clk_disable(pfdev->bus_clock);
-
+		clk_disable(pfdev->bus_clock);
 		clk_disable(pfdev->clock);
 		reset_control_assert(pfdev->rstc);
 	}
-- 
2.43.0

Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Adrián Larumbe]

Hi Biju,

On 20.03.2026 16:41, Biju wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> The clk_enable() and clk_disable() APIs already handle NULL clock pointers
> gracefully — clk_enable() returns 0 and clk_disable() returns immediately
> when passed a NULL or optional clock. The explicit if (pfdev->bus_clock)
> guards around these calls in the runtime suspend/resume paths are
> therefore unnecessary. Remove them to simplify the code.
>
> Reviewed-by: Steven Price <steven.price@arm.com>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v1->v2:
>  * Collected tag
> ---
>  drivers/gpu/drm/panfrost/panfrost_device.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
> index dedc13e56631..01e702a0b2f0 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> @@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
>  		if (ret)
>  			goto err_clk;
>
> -		if (pfdev->bus_clock) {
> -			ret = clk_enable(pfdev->bus_clock);
> -			if (ret)
> -				goto err_bus_clk;
> -		}
> +		ret = clk_enable(pfdev->bus_clock);
> +		if (ret)
> +			goto err_bus_clk;
>  	}

It seems clk_prepare_enable() can also deal with NULL clock device pointers gracefully,
so maybe you could also do away with pointer checks in panfrost_clk_init?

Other than that,

Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>

>  	panfrost_device_reset(pfdev, true);
> @@ -464,9 +462,7 @@ static int panfrost_device_runtime_suspend(struct device *dev)
>  	panfrost_gpu_power_off(pfdev);
>
>  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
> -		if (pfdev->bus_clock)
> -			clk_disable(pfdev->bus_clock);
> -
> +		clk_disable(pfdev->bus_clock);
>  		clk_disable(pfdev->clock);
>  		reset_control_assert(pfdev->rstc);
>  	}
> --
> 2.43.0


Adrian Larumbe

RE: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Biju Das]

> -----Original Message-----
> From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf Of Adrián Larumbe
> Sent: 20 March 2026 21:20
> To: biju.das.au <biju.das.au@gmail.com>
> Cc: Boris Brezillon <boris.brezillon@collabora.com>; Rob Herring <robh@kernel.org>; Steven Price
> <steven.price@arm.com>; Maarten Lankhorst <maarten.lankhorst@linux.intel.com>; Maxime Ripard
> <mripard@kernel.org>; Thomas Zimmermann <tzimmermann@suse.de>; David Airlie <airlied@gmail.com>;
> Simona Vetter <simona@ffwll.ch>; Biju Das <biju.das.jz@bp.renesas.com>; dri-
> devel@lists.freedesktop.org; linux-kernel@vger.kernel.org; Geert Uytterhoeven
> <geert+renesas@glider.be>; Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>; linux-
> renesas-soc@vger.kernel.org
> Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM
> 
> Hi Biju,
> 
> On 20.03.2026 16:41, Biju wrote:
> > From: Biju Das <biju.das.jz@bp.renesas.com>
> >
> > The clk_enable() and clk_disable() APIs already handle NULL clock
> > pointers gracefully — clk_enable() returns 0 and clk_disable() returns
> > immediately when passed a NULL or optional clock. The explicit if
> > (pfdev->bus_clock) guards around these calls in the runtime
> > suspend/resume paths are therefore unnecessary. Remove them to simplify the code.
> >
> > Reviewed-by: Steven Price <steven.price@arm.com>
> > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > ---
> > v1->v2:
> >  * Collected tag
> > ---
> >  drivers/gpu/drm/panfrost/panfrost_device.c | 12 ++++--------
> >  1 file changed, 4 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c
> > b/drivers/gpu/drm/panfrost/panfrost_device.c
> > index dedc13e56631..01e702a0b2f0 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> > +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> > @@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
> >  		if (ret)
> >  			goto err_clk;
> >
> > -		if (pfdev->bus_clock) {
> > -			ret = clk_enable(pfdev->bus_clock);
> > -			if (ret)
> > -				goto err_bus_clk;
> > -		}
> > +		ret = clk_enable(pfdev->bus_clock);
> > +		if (ret)
> > +			goto err_bus_clk;
> >  	}
> 
> It seems clk_prepare_enable() can also deal with NULL clock device pointers gracefully, so maybe you
> could also do away with pointer checks in panfrost_clk_init?

This is the only check and no need to print rate for optional clk. That is the reason I have not
touched this.

	if (pfdev->bus_clock) {
		rate = clk_get_rate(pfdev->bus_clock);
		dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate);

		err = clk_prepare_enable(pfdev->bus_clock);
		if (err)
			goto disable_clock;
	}

Cheers,
Biju
> 
> Other than that,
> 
> Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>
> 
> >  	panfrost_device_reset(pfdev, true);
> > @@ -464,9 +462,7 @@ static int panfrost_device_runtime_suspend(struct device *dev)
> >  	panfrost_gpu_power_off(pfdev);
> >
> >  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
> > -		if (pfdev->bus_clock)
> > -			clk_disable(pfdev->bus_clock);
> > -
> > +		clk_disable(pfdev->bus_clock);
> >  		clk_disable(pfdev->clock);
> >  		reset_control_assert(pfdev->rstc);
> >  	}
> > --
> > 2.43.0
> 
> 
> Adrian Larumbe

RE: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Biju Das]

Hi Adrián Larumbe,

Thanks for the feedback.

> -----Original Message-----
> From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf Of Biju Das
> Sent: 20 March 2026 21:32
> Subject: RE: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM
> 
> 
> 
> > -----Original Message-----
> > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf Of
> > Adrián Larumbe
> > Sent: 20 March 2026 21:20
> > Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional
> > clock checks in runtime PM
> >
> > Hi Biju,
> >
> > On 20.03.2026 16:41, Biju wrote:
> > > From: Biju Das <biju.das.jz@bp.renesas.com>
> > >
> > > The clk_enable() and clk_disable() APIs already handle NULL clock
> > > pointers gracefully — clk_enable() returns 0 and clk_disable()
> > > returns immediately when passed a NULL or optional clock. The
> > > explicit if
> > > (pfdev->bus_clock) guards around these calls in the runtime
> > > suspend/resume paths are therefore unnecessary. Remove them to simplify the code.
> > >
> > > Reviewed-by: Steven Price <steven.price@arm.com>
> > > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > ---
> > > v1->v2:
> > >  * Collected tag
> > > ---
> > >  drivers/gpu/drm/panfrost/panfrost_device.c | 12 ++++--------
> > >  1 file changed, 4 insertions(+), 8 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > index dedc13e56631..01e702a0b2f0 100644
> > > --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > @@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
> > >  		if (ret)
> > >  			goto err_clk;
> > >
> > > -		if (pfdev->bus_clock) {
> > > -			ret = clk_enable(pfdev->bus_clock);
> > > -			if (ret)
> > > -				goto err_bus_clk;
> > > -		}
> > > +		ret = clk_enable(pfdev->bus_clock);
> > > +		if (ret)
> > > +			goto err_bus_clk;
> > >  	}
> >
> > It seems clk_prepare_enable() can also deal with NULL clock device
> > pointers gracefully, so maybe you could also do away with pointer checks in panfrost_clk_init?
> 
> This is the only check and no need to print rate for optional clk. That is the reason I have not
> touched this.
> 
> 	if (pfdev->bus_clock) {
> 		rate = clk_get_rate(pfdev->bus_clock);
> 		dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate);
> 
> 		err = clk_prepare_enable(pfdev->bus_clock);
> 		if (err)
> 			goto disable_clock;
> 	}

The above block is good for optional clock.

Otherwise, there will be 2 checks for optional clk.

One here:

if (pfdev->bus_clock) {
	rate = clk_get_rate(pfdev->bus_clock);
	dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate);
}

and one inside the clk_prepare_enable(): 

err = clk_prepare_enable(pfdev->bus_clock);

Please let me know your thoughts.

Cheers,
Biju

> 
> Cheers,
> Biju
> >
> > Other than that,
> >
> > Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>
> >
> > >  	panfrost_device_reset(pfdev, true); @@ -464,9 +462,7 @@ static int
> > > panfrost_device_runtime_suspend(struct device *dev)
> > >  	panfrost_gpu_power_off(pfdev);
> > >
> > >  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
> > > -		if (pfdev->bus_clock)
> > > -			clk_disable(pfdev->bus_clock);
> > > -
> > > +		clk_disable(pfdev->bus_clock);
> > >  		clk_disable(pfdev->clock);
> > >  		reset_control_assert(pfdev->rstc);
> > >  	}
> > > --
> > > 2.43.0
> >
> >
> > Adrian Larumbe

Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Adrián Larumbe]

On 21.03.2026 14:16, Biju Das wrote:
> Hi Adrián Larumbe,
>
> Thanks for the feedback.
>
> > -----Original Message-----
> > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf Of Biju Das
> > Sent: 20 March 2026 21:32
> > Subject: RE: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM
> >
> >
> >
> > > -----Original Message-----
> > > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf Of
> > > Adrián Larumbe
> > > Sent: 20 March 2026 21:20
> > > Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional
> > > clock checks in runtime PM
> > >
> > > Hi Biju,
> > >
> > > On 20.03.2026 16:41, Biju wrote:
> > > > From: Biju Das <biju.das.jz@bp.renesas.com>
> > > >
> > > > The clk_enable() and clk_disable() APIs already handle NULL clock
> > > > pointers gracefully — clk_enable() returns 0 and clk_disable()
> > > > returns immediately when passed a NULL or optional clock. The
> > > > explicit if
> > > > (pfdev->bus_clock) guards around these calls in the runtime
> > > > suspend/resume paths are therefore unnecessary. Remove them to simplify the code.
> > > >
> > > > Reviewed-by: Steven Price <steven.price@arm.com>
> > > > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > > ---
> > > > v1->v2:
> > > >  * Collected tag
> > > > ---
> > > >  drivers/gpu/drm/panfrost/panfrost_device.c | 12 ++++--------
> > > >  1 file changed, 4 insertions(+), 8 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > index dedc13e56631..01e702a0b2f0 100644
> > > > --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > @@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
> > > >  		if (ret)
> > > >  			goto err_clk;
> > > >
> > > > -		if (pfdev->bus_clock) {
> > > > -			ret = clk_enable(pfdev->bus_clock);
> > > > -			if (ret)
> > > > -				goto err_bus_clk;
> > > > -		}
> > > > +		ret = clk_enable(pfdev->bus_clock);
> > > > +		if (ret)
> > > > +			goto err_bus_clk;
> > > >  	}
> > >
> > > It seems clk_prepare_enable() can also deal with NULL clock device
> > > pointers gracefully, so maybe you could also do away with pointer checks in panfrost_clk_init?
> >
> > This is the only check and no need to print rate for optional clk. That is the reason I have not
> > touched this.
> >
> > 	if (pfdev->bus_clock) {
> > 		rate = clk_get_rate(pfdev->bus_clock);
> > 		dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate);
> >
> > 		err = clk_prepare_enable(pfdev->bus_clock);
> > 		if (err)
> > 			goto disable_clock;
> > 	}
>
> The above block is good for optional clock.
>
> Otherwise, there will be 2 checks for optional clk.
>
> One here:
>
> if (pfdev->bus_clock) {
> 	rate = clk_get_rate(pfdev->bus_clock);
> 	dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate);
> }
>
> and one inside the clk_prepare_enable():
>
> err = clk_prepare_enable(pfdev->bus_clock);
>
> Please let me know your thoughts.

You're right, it's probably best to leave it the way it is.

Cheers,
Adrian

> Cheers,
> Biju
>
> >
> > Cheers,
> > Biju
> > >
> > > Other than that,
> > >
> > > Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>
> > >
> > > >  	panfrost_device_reset(pfdev, true); @@ -464,9 +462,7 @@ static int
> > > > panfrost_device_runtime_suspend(struct device *dev)
> > > >  	panfrost_gpu_power_off(pfdev);
> > > >
> > > >  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
> > > > -		if (pfdev->bus_clock)
> > > > -			clk_disable(pfdev->bus_clock);
> > > > -
> > > > +		clk_disable(pfdev->bus_clock);
> > > >  		clk_disable(pfdev->clock);
> > > >  		reset_control_assert(pfdev->rstc);
> > > >  	}
> > > > --
> > > > 2.43.0
> > >
> > >
> > > Adrian Larumbe

RE: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Biju Das]

Hi Adrian,

> -----Original Message-----
> From: Adrián Larumbe <adrian.larumbe@collabora.com>
> Sent: 24 March 2026 17:11
> Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM
> 
> On 21.03.2026 14:16, Biju Das wrote:
> > Hi Adrián Larumbe,
> >
> > Thanks for the feedback.
> >
> > > -----Original Message-----
> > > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf
> > > Of Biju Das
> > > Sent: 20 March 2026 21:32
> > > Subject: RE: [PATCH v2 2/4] drm/panfrost: Drop redundant optional
> > > clock checks in runtime PM
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On
> > > > Behalf Of Adrián Larumbe
> > > > Sent: 20 March 2026 21:20
> > > > Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional
> > > > clock checks in runtime PM
> > > >
> > > > Hi Biju,
> > > >
> > > > On 20.03.2026 16:41, Biju wrote:
> > > > > From: Biju Das <biju.das.jz@bp.renesas.com>
> > > > >
> > > > > The clk_enable() and clk_disable() APIs already handle NULL
> > > > > clock pointers gracefully — clk_enable() returns 0 and
> > > > > clk_disable() returns immediately when passed a NULL or optional
> > > > > clock. The explicit if
> > > > > (pfdev->bus_clock) guards around these calls in the runtime
> > > > > suspend/resume paths are therefore unnecessary. Remove them to simplify the code.
> > > > >
> > > > > Reviewed-by: Steven Price <steven.price@arm.com>
> > > > > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > > > ---
> > > > > v1->v2:
> > > > >  * Collected tag
> > > > > ---
> > > > >  drivers/gpu/drm/panfrost/panfrost_device.c | 12 ++++--------
> > > > >  1 file changed, 4 insertions(+), 8 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > index dedc13e56631..01e702a0b2f0 100644
> > > > > --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > @@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
> > > > >  		if (ret)
> > > > >  			goto err_clk;
> > > > >
> > > > > -		if (pfdev->bus_clock) {
> > > > > -			ret = clk_enable(pfdev->bus_clock);
> > > > > -			if (ret)
> > > > > -				goto err_bus_clk;
> > > > > -		}
> > > > > +		ret = clk_enable(pfdev->bus_clock);
> > > > > +		if (ret)
> > > > > +			goto err_bus_clk;
> > > > >  	}
> > > >
> > > > It seems clk_prepare_enable() can also deal with NULL clock device
> > > > pointers gracefully, so maybe you could also do away with pointer checks in panfrost_clk_init?
> > >
> > > This is the only check and no need to print rate for optional clk.
> > > That is the reason I have not touched this.
> > >
> > > 	if (pfdev->bus_clock) {
> > > 		rate = clk_get_rate(pfdev->bus_clock);
> > > 		dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate);
> > >
> > > 		err = clk_prepare_enable(pfdev->bus_clock);
> > > 		if (err)
> > > 			goto disable_clock;
> > > 	}
> >
> > The above block is good for optional clock.
> >
> > Otherwise, there will be 2 checks for optional clk.
> >
> > One here:
> >
> > if (pfdev->bus_clock) {
> > 	rate = clk_get_rate(pfdev->bus_clock);
> > 	dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate); }
> >
> > and one inside the clk_prepare_enable():
> >
> > err = clk_prepare_enable(pfdev->bus_clock);
> >
> > Please let me know your thoughts.
> 
> You're right, it's probably best to leave it the way it is.

If you are happy with the series, can you please merge it?

Cheers,
Biju

Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Adrián Larumbe]

On 26.03.2026 08:55, Biju Das wrote:
> Hi Adrian,
>
> > -----Original Message-----
> > From: Adrián Larumbe <adrian.larumbe@collabora.com>
> > Sent: 24 March 2026 17:11
> > Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM
> >
> > On 21.03.2026 14:16, Biju Das wrote:
> > > Hi Adrián Larumbe,
> > >
> > > Thanks for the feedback.
> > >
> > > > -----Original Message-----
> > > > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf
> > > > Of Biju Das
> > > > Sent: 20 March 2026 21:32
> > > > Subject: RE: [PATCH v2 2/4] drm/panfrost: Drop redundant optional
> > > > clock checks in runtime PM
> > > >
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On
> > > > > Behalf Of Adrián Larumbe
> > > > > Sent: 20 March 2026 21:20
> > > > > Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional
> > > > > clock checks in runtime PM
> > > > >
> > > > > Hi Biju,
> > > > >
> > > > > On 20.03.2026 16:41, Biju wrote:
> > > > > > From: Biju Das <biju.das.jz@bp.renesas.com>
> > > > > >
> > > > > > The clk_enable() and clk_disable() APIs already handle NULL
> > > > > > clock pointers gracefully — clk_enable() returns 0 and
> > > > > > clk_disable() returns immediately when passed a NULL or optional
> > > > > > clock. The explicit if
> > > > > > (pfdev->bus_clock) guards around these calls in the runtime
> > > > > > suspend/resume paths are therefore unnecessary. Remove them to simplify the code.
> > > > > >
> > > > > > Reviewed-by: Steven Price <steven.price@arm.com>
> > > > > > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > > > > ---
> > > > > > v1->v2:
> > > > > >  * Collected tag
> > > > > > ---
> > > > > >  drivers/gpu/drm/panfrost/panfrost_device.c | 12 ++++--------
> > > > > >  1 file changed, 4 insertions(+), 8 deletions(-)
> > > > > >
> > > > > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > > b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > > index dedc13e56631..01e702a0b2f0 100644
> > > > > > --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > > +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > > @@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
> > > > > >  		if (ret)
> > > > > >  			goto err_clk;
> > > > > >
> > > > > > -		if (pfdev->bus_clock) {
> > > > > > -			ret = clk_enable(pfdev->bus_clock);
> > > > > > -			if (ret)
> > > > > > -				goto err_bus_clk;
> > > > > > -		}
> > > > > > +		ret = clk_enable(pfdev->bus_clock);
> > > > > > +		if (ret)
> > > > > > +			goto err_bus_clk;
> > > > > >  	}
> > > > >
> > > > > It seems clk_prepare_enable() can also deal with NULL clock device
> > > > > pointers gracefully, so maybe you could also do away with pointer checks in panfrost_clk_init?
> > > >
> > > > This is the only check and no need to print rate for optional clk.
> > > > That is the reason I have not touched this.
> > > >
> > > > 	if (pfdev->bus_clock) {
> > > > 		rate = clk_get_rate(pfdev->bus_clock);
> > > > 		dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate);
> > > >
> > > > 		err = clk_prepare_enable(pfdev->bus_clock);
> > > > 		if (err)
> > > > 			goto disable_clock;
> > > > 	}
> > >
> > > The above block is good for optional clock.
> > >
> > > Otherwise, there will be 2 checks for optional clk.
> > >
> > > One here:
> > >
> > > if (pfdev->bus_clock) {
> > > 	rate = clk_get_rate(pfdev->bus_clock);
> > > 	dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate); }
> > >
> > > and one inside the clk_prepare_enable():
> > >
> > > err = clk_prepare_enable(pfdev->bus_clock);
> > >
> > > Please let me know your thoughts.
> >
> > You're right, it's probably best to leave it the way it is.
>
> If you are happy with the series, can you please merge it?

Will do, I'll add my Rb's and let you know when it's merged.

> Cheers,
> Biju

Adrian Larumbe

RE: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Biju Das]

Hi Adrian,

> -----Original Message-----
> From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf Of Adrián Larumbe
> Sent: 26 March 2026 11:59
> Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM
> 
> On 26.03.2026 08:55, Biju Das wrote:
> > Hi Adrian,
> >
> > > -----Original Message-----
> > > From: Adrián Larumbe <adrian.larumbe@collabora.com>
> > > Sent: 24 March 2026 17:11
> > > Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional
> > > clock checks in runtime PM
> > >
> > > On 21.03.2026 14:16, Biju Das wrote:
> > > > Hi Adrián Larumbe,
> > > >
> > > > Thanks for the feedback.
> > > >
> > > > > -----Original Message-----
> > > > > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On
> > > > > Behalf Of Biju Das
> > > > > Sent: 20 March 2026 21:32
> > > > > Subject: RE: [PATCH v2 2/4] drm/panfrost: Drop redundant
> > > > > optional clock checks in runtime PM
> > > > >
> > > > >
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On
> > > > > > Behalf Of Adrián Larumbe
> > > > > > Sent: 20 March 2026 21:20
> > > > > > Subject: Re: [PATCH v2 2/4] drm/panfrost: Drop redundant
> > > > > > optional clock checks in runtime PM
> > > > > >
> > > > > > Hi Biju,
> > > > > >
> > > > > > On 20.03.2026 16:41, Biju wrote:
> > > > > > > From: Biju Das <biju.das.jz@bp.renesas.com>
> > > > > > >
> > > > > > > The clk_enable() and clk_disable() APIs already handle NULL
> > > > > > > clock pointers gracefully — clk_enable() returns 0 and
> > > > > > > clk_disable() returns immediately when passed a NULL or
> > > > > > > optional clock. The explicit if
> > > > > > > (pfdev->bus_clock) guards around these calls in the runtime
> > > > > > > suspend/resume paths are therefore unnecessary. Remove them to simplify the code.
> > > > > > >
> > > > > > > Reviewed-by: Steven Price <steven.price@arm.com>
> > > > > > > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > > > > > ---
> > > > > > > v1->v2:
> > > > > > >  * Collected tag
> > > > > > > ---
> > > > > > >  drivers/gpu/drm/panfrost/panfrost_device.c | 12
> > > > > > > ++++--------
> > > > > > >  1 file changed, 4 insertions(+), 8 deletions(-)
> > > > > > >
> > > > > > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > > > b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > > > index dedc13e56631..01e702a0b2f0 100644
> > > > > > > --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > > > +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> > > > > > > @@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
> > > > > > >  		if (ret)
> > > > > > >  			goto err_clk;
> > > > > > >
> > > > > > > -		if (pfdev->bus_clock) {
> > > > > > > -			ret = clk_enable(pfdev->bus_clock);
> > > > > > > -			if (ret)
> > > > > > > -				goto err_bus_clk;
> > > > > > > -		}
> > > > > > > +		ret = clk_enable(pfdev->bus_clock);
> > > > > > > +		if (ret)
> > > > > > > +			goto err_bus_clk;
> > > > > > >  	}
> > > > > >
> > > > > > It seems clk_prepare_enable() can also deal with NULL clock
> > > > > > device pointers gracefully, so maybe you could also do away with pointer checks in
> panfrost_clk_init?
> > > > >
> > > > > This is the only check and no need to print rate for optional clk.
> > > > > That is the reason I have not touched this.
> > > > >
> > > > > 	if (pfdev->bus_clock) {
> > > > > 		rate = clk_get_rate(pfdev->bus_clock);
> > > > > 		dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate);
> > > > >
> > > > > 		err = clk_prepare_enable(pfdev->bus_clock);
> > > > > 		if (err)
> > > > > 			goto disable_clock;
> > > > > 	}
> > > >
> > > > The above block is good for optional clock.
> > > >
> > > > Otherwise, there will be 2 checks for optional clk.
> > > >
> > > > One here:
> > > >
> > > > if (pfdev->bus_clock) {
> > > > 	rate = clk_get_rate(pfdev->bus_clock);
> > > > 	dev_info(pfdev->base.dev, "bus_clock rate = %lu\n", rate); }
> > > >
> > > > and one inside the clk_prepare_enable():
> > > >
> > > > err = clk_prepare_enable(pfdev->bus_clock);
> > > >
> > > > Please let me know your thoughts.
> > >
> > > You're right, it's probably best to leave it the way it is.
> >
> > If you are happy with the series, can you please merge it?
> 
> Will do, I'll add my Rb's and let you know when it's merged.

Thank you,

Biju

Re: [PATCH v2 2/4] drm/panfrost: Drop redundant optional clock checks in runtime PM

[Adrián Larumbe]

Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>

On 20.03.2026 16:41, Biju wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> The clk_enable() and clk_disable() APIs already handle NULL clock pointers
> gracefully — clk_enable() returns 0 and clk_disable() returns immediately
> when passed a NULL or optional clock. The explicit if (pfdev->bus_clock)
> guards around these calls in the runtime suspend/resume paths are
> therefore unnecessary. Remove them to simplify the code.
>
> Reviewed-by: Steven Price <steven.price@arm.com>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v1->v2:
>  * Collected tag
> ---
>  drivers/gpu/drm/panfrost/panfrost_device.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
> index dedc13e56631..01e702a0b2f0 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> @@ -429,11 +429,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
>  		if (ret)
>  			goto err_clk;
>
> -		if (pfdev->bus_clock) {
> -			ret = clk_enable(pfdev->bus_clock);
> -			if (ret)
> -				goto err_bus_clk;
> -		}
> +		ret = clk_enable(pfdev->bus_clock);
> +		if (ret)
> +			goto err_bus_clk;
>  	}
>
>  	panfrost_device_reset(pfdev, true);
> @@ -464,9 +462,7 @@ static int panfrost_device_runtime_suspend(struct device *dev)
>  	panfrost_gpu_power_off(pfdev);
>
>  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
> -		if (pfdev->bus_clock)
> -			clk_disable(pfdev->bus_clock);
> -
> +		clk_disable(pfdev->bus_clock);
>  		clk_disable(pfdev->clock);
>  		reset_control_assert(pfdev->rstc);
>  	}
> --
> 2.43.0


Adrian Larumbe

[PATCH v2 3/4] drm/panfrost: Add bus_ace optional clock support for RZ/G2L

[Biju]

From: Biju Das <biju.das.jz@bp.renesas.com>

On RZ/G2L SoCs, the GPU MMU requires a bus_ace clock to operate correctly.
Without it, unbind/bind cycles leave the GPU non-operational, manifesting
as an AS_ACTIVE bit stuck and a soft reset timeout falling back to hard
reset. Add bus_ace_clock as an optional clock, wiring it into init/fini,
and the runtime suspend/resume paths alongside the existing optional
bus_clock.

Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * Dropped duplicate err assignment
 * Changed the format string of dev_err to "%d" and simplify the dev_err()
   line by using err rather than the same PTR_ERR().
 * Collected tag
---
 drivers/gpu/drm/panfrost/panfrost_device.c | 22 ++++++++++++++++++++++
 drivers/gpu/drm/panfrost/panfrost_device.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index 01e702a0b2f0..7fed22d555a5 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -70,8 +70,21 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)
 			goto disable_clock;
 	}
 
+	pfdev->bus_ace_clock = devm_clk_get_optional(pfdev->base.dev, "bus_ace");
+	if (IS_ERR(pfdev->bus_ace_clock)) {
+		err = PTR_ERR(pfdev->bus_ace_clock);
+		dev_err(pfdev->base.dev, "get bus_ace_clock failed %d\n", err);
+		goto disable_bus_clock;
+	}
+
+	err = clk_prepare_enable(pfdev->bus_ace_clock);
+	if (err)
+		goto disable_bus_clock;
+
 	return 0;
 
+disable_bus_clock:
+	clk_disable_unprepare(pfdev->bus_clock);
 disable_clock:
 	clk_disable_unprepare(pfdev->clock);
 
@@ -80,6 +93,7 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)
 
 static void panfrost_clk_fini(struct panfrost_device *pfdev)
 {
+	clk_disable_unprepare(pfdev->bus_ace_clock);
 	clk_disable_unprepare(pfdev->bus_clock);
 	clk_disable_unprepare(pfdev->clock);
 }
@@ -432,6 +446,10 @@ static int panfrost_device_runtime_resume(struct device *dev)
 		ret = clk_enable(pfdev->bus_clock);
 		if (ret)
 			goto err_bus_clk;
+
+		ret = clk_enable(pfdev->bus_ace_clock);
+		if (ret)
+			goto err_bus_ace_clk;
 	}
 
 	panfrost_device_reset(pfdev, true);
@@ -439,6 +457,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
 
 	return 0;
 
+err_bus_ace_clk:
+	if (pfdev->comp->pm_features & BIT(GPU_PM_RT))
+		clk_disable(pfdev->bus_clock);
 err_bus_clk:
 	if (pfdev->comp->pm_features & BIT(GPU_PM_RT))
 		clk_disable(pfdev->clock);
@@ -462,6 +483,7 @@ static int panfrost_device_runtime_suspend(struct device *dev)
 	panfrost_gpu_power_off(pfdev);
 
 	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
+		clk_disable(pfdev->bus_ace_clock);
 		clk_disable(pfdev->bus_clock);
 		clk_disable(pfdev->clock);
 		reset_control_assert(pfdev->rstc);
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 0f3992412205..ec55c136b1b6 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -136,6 +136,7 @@ struct panfrost_device {
 	void __iomem *iomem;
 	struct clk *clock;
 	struct clk *bus_clock;
+	struct clk *bus_ace_clock;
 	struct regulator_bulk_data *regulators;
 	struct reset_control *rstc;
 	/* pm_domains for devices with more than one. */
-- 
2.43.0

Re: [PATCH v2 3/4] drm/panfrost: Add bus_ace optional clock support for RZ/G2L

[Adrián Larumbe]

Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>

On 20.03.2026 16:41, Biju wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> On RZ/G2L SoCs, the GPU MMU requires a bus_ace clock to operate correctly.
> Without it, unbind/bind cycles leave the GPU non-operational, manifesting
> as an AS_ACTIVE bit stuck and a soft reset timeout falling back to hard
> reset. Add bus_ace_clock as an optional clock, wiring it into init/fini,
> and the runtime suspend/resume paths alongside the existing optional
> bus_clock.
>
> Reviewed-by: Steven Price <steven.price@arm.com>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v1->v2:
>  * Dropped duplicate err assignment
>  * Changed the format string of dev_err to "%d" and simplify the dev_err()
>    line by using err rather than the same PTR_ERR().
>  * Collected tag
> ---
>  drivers/gpu/drm/panfrost/panfrost_device.c | 22 ++++++++++++++++++++++
>  drivers/gpu/drm/panfrost/panfrost_device.h |  1 +
>  2 files changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
> index 01e702a0b2f0..7fed22d555a5 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> @@ -70,8 +70,21 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)
>  			goto disable_clock;
>  	}
>
> +	pfdev->bus_ace_clock = devm_clk_get_optional(pfdev->base.dev, "bus_ace");
> +	if (IS_ERR(pfdev->bus_ace_clock)) {
> +		err = PTR_ERR(pfdev->bus_ace_clock);
> +		dev_err(pfdev->base.dev, "get bus_ace_clock failed %d\n", err);
> +		goto disable_bus_clock;
> +	}
> +
> +	err = clk_prepare_enable(pfdev->bus_ace_clock);
> +	if (err)
> +		goto disable_bus_clock;
> +
>  	return 0;
>
> +disable_bus_clock:
> +	clk_disable_unprepare(pfdev->bus_clock);
>  disable_clock:
>  	clk_disable_unprepare(pfdev->clock);
>
> @@ -80,6 +93,7 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)
>
>  static void panfrost_clk_fini(struct panfrost_device *pfdev)
>  {
> +	clk_disable_unprepare(pfdev->bus_ace_clock);
>  	clk_disable_unprepare(pfdev->bus_clock);
>  	clk_disable_unprepare(pfdev->clock);
>  }
> @@ -432,6 +446,10 @@ static int panfrost_device_runtime_resume(struct device *dev)
>  		ret = clk_enable(pfdev->bus_clock);
>  		if (ret)
>  			goto err_bus_clk;
> +
> +		ret = clk_enable(pfdev->bus_ace_clock);
> +		if (ret)
> +			goto err_bus_ace_clk;
>  	}
>
>  	panfrost_device_reset(pfdev, true);
> @@ -439,6 +457,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
>
>  	return 0;
>
> +err_bus_ace_clk:
> +	if (pfdev->comp->pm_features & BIT(GPU_PM_RT))
> +		clk_disable(pfdev->bus_clock);
>  err_bus_clk:
>  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT))
>  		clk_disable(pfdev->clock);
> @@ -462,6 +483,7 @@ static int panfrost_device_runtime_suspend(struct device *dev)
>  	panfrost_gpu_power_off(pfdev);
>
>  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
> +		clk_disable(pfdev->bus_ace_clock);
>  		clk_disable(pfdev->bus_clock);
>  		clk_disable(pfdev->clock);
>  		reset_control_assert(pfdev->rstc);
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 0f3992412205..ec55c136b1b6 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -136,6 +136,7 @@ struct panfrost_device {
>  	void __iomem *iomem;
>  	struct clk *clock;
>  	struct clk *bus_clock;
> +	struct clk *bus_ace_clock;
>  	struct regulator_bulk_data *regulators;
>  	struct reset_control *rstc;
>  	/* pm_domains for devices with more than one. */
> --
> 2.43.0


Adrian Larumbe

Re: [PATCH v2 3/4] drm/panfrost: Add bus_ace optional clock support for RZ/G2L

[Adrián Larumbe]

Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>

On 20.03.2026 16:41, Biju wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> On RZ/G2L SoCs, the GPU MMU requires a bus_ace clock to operate correctly.
> Without it, unbind/bind cycles leave the GPU non-operational, manifesting
> as an AS_ACTIVE bit stuck and a soft reset timeout falling back to hard
> reset. Add bus_ace_clock as an optional clock, wiring it into init/fini,
> and the runtime suspend/resume paths alongside the existing optional
> bus_clock.
>
> Reviewed-by: Steven Price <steven.price@arm.com>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v1->v2:
>  * Dropped duplicate err assignment
>  * Changed the format string of dev_err to "%d" and simplify the dev_err()
>    line by using err rather than the same PTR_ERR().
>  * Collected tag
> ---
>  drivers/gpu/drm/panfrost/panfrost_device.c | 22 ++++++++++++++++++++++
>  drivers/gpu/drm/panfrost/panfrost_device.h |  1 +
>  2 files changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
> index 01e702a0b2f0..7fed22d555a5 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> @@ -70,8 +70,21 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)
>  			goto disable_clock;
>  	}
>
> +	pfdev->bus_ace_clock = devm_clk_get_optional(pfdev->base.dev, "bus_ace");
> +	if (IS_ERR(pfdev->bus_ace_clock)) {
> +		err = PTR_ERR(pfdev->bus_ace_clock);
> +		dev_err(pfdev->base.dev, "get bus_ace_clock failed %d\n", err);
> +		goto disable_bus_clock;
> +	}
> +
> +	err = clk_prepare_enable(pfdev->bus_ace_clock);
> +	if (err)
> +		goto disable_bus_clock;
> +
>  	return 0;
>
> +disable_bus_clock:
> +	clk_disable_unprepare(pfdev->bus_clock);
>  disable_clock:
>  	clk_disable_unprepare(pfdev->clock);
>
> @@ -80,6 +93,7 @@ static int panfrost_clk_init(struct panfrost_device *pfdev)
>
>  static void panfrost_clk_fini(struct panfrost_device *pfdev)
>  {
> +	clk_disable_unprepare(pfdev->bus_ace_clock);
>  	clk_disable_unprepare(pfdev->bus_clock);
>  	clk_disable_unprepare(pfdev->clock);
>  }
> @@ -432,6 +446,10 @@ static int panfrost_device_runtime_resume(struct device *dev)
>  		ret = clk_enable(pfdev->bus_clock);
>  		if (ret)
>  			goto err_bus_clk;
> +
> +		ret = clk_enable(pfdev->bus_ace_clock);
> +		if (ret)
> +			goto err_bus_ace_clk;
>  	}
>
>  	panfrost_device_reset(pfdev, true);
> @@ -439,6 +457,9 @@ static int panfrost_device_runtime_resume(struct device *dev)
>
>  	return 0;
>
> +err_bus_ace_clk:
> +	if (pfdev->comp->pm_features & BIT(GPU_PM_RT))
> +		clk_disable(pfdev->bus_clock);
>  err_bus_clk:
>  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT))
>  		clk_disable(pfdev->clock);
> @@ -462,6 +483,7 @@ static int panfrost_device_runtime_suspend(struct device *dev)
>  	panfrost_gpu_power_off(pfdev);
>
>  	if (pfdev->comp->pm_features & BIT(GPU_PM_RT)) {
> +		clk_disable(pfdev->bus_ace_clock);
>  		clk_disable(pfdev->bus_clock);
>  		clk_disable(pfdev->clock);
>  		reset_control_assert(pfdev->rstc);
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
> index 0f3992412205..ec55c136b1b6 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.h
> @@ -136,6 +136,7 @@ struct panfrost_device {
>  	void __iomem *iomem;
>  	struct clk *clock;
>  	struct clk *bus_clock;
> +	struct clk *bus_ace_clock;
>  	struct regulator_bulk_data *regulators;
>  	struct reset_control *rstc;
>  	/* pm_domains for devices with more than one. */
> --
> 2.43.0


Adrian Larumbe

[PATCH v2 4/4] drm/panfrost: Add GPU_PM_RT support for RZ/G3L SoC

[Biju]

From: Biju Das <biju.das.jz@bp.renesas.com>

RZ/G3L SoC is embedded with Mali-G31 GPU system. Add GPU_PM_RT support as
it needs to be assert/deassert the reset during suspend/resume.

Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * Collected tag
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 711f5101aa04..3d0bdba2a474 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -1156,6 +1156,7 @@ static const struct of_device_id dt_match[] = {
 	  .data = &amlogic_data, },
 	{ .compatible = "amlogic,meson-g12a-mali",
 	  .data = &amlogic_data, },
+	{ .compatible = "renesas,r9a08g046-mali", .data = &default_pm_rt_data },
 	{ .compatible = "renesas,r9a09g047-mali", .data = &default_pm_rt_data },
 	{ .compatible = "arm,mali-t604", .data = &default_data, },
 	{ .compatible = "arm,mali-t624", .data = &default_data, },
-- 
2.43.0

Re: [PATCH v2 4/4] drm/panfrost: Add GPU_PM_RT support for RZ/G3L SoC

[Adrián Larumbe]

Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>

On 20.03.2026 16:41, Biju wrote:
From: Biju Das <biju.das.jz@bp.renesas.com>

RZ/G3L SoC is embedded with Mali-G31 GPU system. Add GPU_PM_RT support as
it needs to be assert/deassert the reset during suspend/resume.

Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * Collected tag
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 711f5101aa04..3d0bdba2a474 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -1156,6 +1156,7 @@ static const struct of_device_id dt_match[] = {
 	  .data = &amlogic_data, },
 	{ .compatible = "amlogic,meson-g12a-mali",
 	  .data = &amlogic_data, },
+	{ .compatible = "renesas,r9a08g046-mali", .data = &default_pm_rt_data },
 	{ .compatible = "renesas,r9a09g047-mali", .data = &default_pm_rt_data },
 	{ .compatible = "arm,mali-t604", .data = &default_data, },
 	{ .compatible = "arm,mali-t624", .data = &default_data, },
--
2.43.0


Adrian Larumbe

Re: [PATCH v2 4/4] drm/panfrost: Add GPU_PM_RT support for RZ/G3L SoC

[Adrián Larumbe]

Reviewed-by: Adrián Larumbe <adrian.larumbe@collabora.com>

On 20.03.2026 16:41, Biju wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> RZ/G3L SoC is embedded with Mali-G31 GPU system. Add GPU_PM_RT support as
> it needs to be assert/deassert the reset during suspend/resume.
>
> Reviewed-by: Steven Price <steven.price@arm.com>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v1->v2:
>  * Collected tag
> ---
>  drivers/gpu/drm/panfrost/panfrost_drv.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
> index 711f5101aa04..3d0bdba2a474 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> @@ -1156,6 +1156,7 @@ static const struct of_device_id dt_match[] = {
>  	  .data = &amlogic_data, },
>  	{ .compatible = "amlogic,meson-g12a-mali",
>  	  .data = &amlogic_data, },
> +	{ .compatible = "renesas,r9a08g046-mali", .data = &default_pm_rt_data },
>  	{ .compatible = "renesas,r9a09g047-mali", .data = &default_pm_rt_data },
>  	{ .compatible = "arm,mali-t604", .data = &default_data, },
>  	{ .compatible = "arm,mali-t624", .data = &default_data, },
> --
> 2.43.0


Adrian Larumbe

Re: [PATCH v2 0/4] Add RZ/G3L GFX support

[Adrián Larumbe]

Applied to drm-misc-next.

On 20.03.2026 16:41, Biju wrote:
> From: Biju Das <biju.das.jz@bp.renesas.com>
>
> The Renesas RZ/G3L SoC includes the Arm Mali-G31 GPU as a 3D Graphics
> Engine (GE3D). The Arm Mali-G31 GPU is a graphics acceleration platform
> that is based on open standards. It supports 2D graphics, 3D graphics, and
> General Purpose computing on GPU (GPGPU). Add the binding and driver
> support for suspend/resume functionality along with some improvements in
> panfrost driver.
>
> v1->v2:
>  * Dropped duplicate err assignment
>  * Changed the format string of dev_err to "%d" and simplify the dev_err()
>    line by using err rather than the same PTR_ERR().
>  * Collected tags
>
> Biju Das (4):
>   dt-bindings: gpu: mali-bifrost: Add compatible for RZ/G3L SoC
>   drm/panfrost: Drop redundant optional clock checks in runtime PM
>   drm/panfrost: Add bus_ace optional clock support for RZ/G2L
>   drm/panfrost: Add GPU_PM_RT support for RZ/G3L SoC
>
>  .../bindings/gpu/arm,mali-bifrost.yaml        |  2 ++
>  drivers/gpu/drm/panfrost/panfrost_device.c    | 34 ++++++++++++++-----
>  drivers/gpu/drm/panfrost/panfrost_device.h    |  1 +
>  drivers/gpu/drm/panfrost/panfrost_drv.c       |  1 +
>  4 files changed, 30 insertions(+), 8 deletions(-)
>
> --
> 2.43.0

Adrian Larumbe