linux-kernel - Re: [PATCH v2 3/3] drm/panfrost: reorder pd/clk/rst sequence

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Message-ID: <417a77f3-8532-4528-9c3d-89671d1e6177@gmail.com>
Date: Fri, 18 Apr 2025 23:38:16 +1000
From: John Williams <porschemad911@...il.com>
To: Philippe Simons <simons.philippe@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-sunxi@...ts.linux.dev, Andre Przywara <andre.przywara@....com>,
 Jernej Škrabec <jernej.skrabec@...il.com>,
 Boris Brezillon <boris.brezillon@...labora.com>,
 Rob Herring <robh@...nel.org>, Steven Price <steven.price@....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>,
 Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v2 3/3] drm/panfrost: reorder pd/clk/rst sequence

I have regression tested this patch on the following devices:

Powkiddy RGB10X - Rockchip RK3326 (Mali G31)

Powkiddy RGB20 Pro - Rockchip RK3566 (Mali G52)

Odroid Go Ultra - Amlogic S922X (Mali G52)

Gameforce ACE - Rockchip RK3588S (Mali G610)

No regressions found during cold boot or with wake after sleep.

Tested-by: John Williams <porschemad911@...il.com>

On 3/4/25 16:52, Philippe Simons wrote:
> According to Mali manuals, the powerup sequence should be
> enable pd, asserting the reset then enabling the clock and
> the reverse for powerdown.
>
> Signed-off-by: Philippe Simons <simons.philippe@...il.com>
> ---
>   drivers/gpu/drm/panfrost/panfrost_device.c | 38 +++++++++++-----------
>   1 file changed, 19 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
> index 93d48e97ce10..5d35076b2e6d 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> @@ -209,10 +209,20 @@ int panfrost_device_init(struct panfrost_device *pfdev)
>   
>   	spin_lock_init(&pfdev->cycle_counter.lock);
>   
> +	err = panfrost_pm_domain_init(pfdev);
> +	if (err)
> +		return err;
> +
> +	err = panfrost_reset_init(pfdev);
> +	if (err) {
> +		dev_err(pfdev->dev, "reset init failed %d\n", err);
> +		goto out_pm_domain;
> +	}
> +
>   	err = panfrost_clk_init(pfdev);
>   	if (err) {
>   		dev_err(pfdev->dev, "clk init failed %d\n", err);
> -		return err;
> +		goto out_reset;
>   	}
>   
>   	err = panfrost_devfreq_init(pfdev);
> @@ -229,25 +239,15 @@ int panfrost_device_init(struct panfrost_device *pfdev)
>   			goto out_devfreq;
>   	}
>   
> -	err = panfrost_reset_init(pfdev);
> -	if (err) {
> -		dev_err(pfdev->dev, "reset init failed %d\n", err);
> -		goto out_regulator;
> -	}
> -
> -	err = panfrost_pm_domain_init(pfdev);
> -	if (err)
> -		goto out_reset;
> -
>   	pfdev->iomem = devm_platform_ioremap_resource(pfdev->pdev, 0);
>   	if (IS_ERR(pfdev->iomem)) {
>   		err = PTR_ERR(pfdev->iomem);
> -		goto out_pm_domain;
> +		goto out_regulator;
>   	}
>   
>   	err = panfrost_gpu_init(pfdev);
>   	if (err)
> -		goto out_pm_domain;
> +		goto out_regulator;
>   
>   	err = panfrost_mmu_init(pfdev);
>   	if (err)
> @@ -268,16 +268,16 @@ int panfrost_device_init(struct panfrost_device *pfdev)
>   	panfrost_mmu_fini(pfdev);
>   out_gpu:
>   	panfrost_gpu_fini(pfdev);
> -out_pm_domain:
> -	panfrost_pm_domain_fini(pfdev);
> -out_reset:
> -	panfrost_reset_fini(pfdev);
>   out_regulator:
>   	panfrost_regulator_fini(pfdev);
>   out_devfreq:
>   	panfrost_devfreq_fini(pfdev);
>   out_clk:
>   	panfrost_clk_fini(pfdev);
> +out_reset:
> +	panfrost_reset_fini(pfdev);
> +out_pm_domain:
> +	panfrost_pm_domain_fini(pfdev);
>   	return err;
>   }
>   
> @@ -287,11 +287,11 @@ void panfrost_device_fini(struct panfrost_device *pfdev)
>   	panfrost_job_fini(pfdev);
>   	panfrost_mmu_fini(pfdev);
>   	panfrost_gpu_fini(pfdev);
> -	panfrost_pm_domain_fini(pfdev);
> -	panfrost_reset_fini(pfdev);
>   	panfrost_devfreq_fini(pfdev);
>   	panfrost_regulator_fini(pfdev);
>   	panfrost_clk_fini(pfdev);
> +	panfrost_reset_fini(pfdev);
> +	panfrost_pm_domain_fini(pfdev);
>   }
>   
>   #define PANFROST_EXCEPTION(id) \