linux-kernel - Re: [PATCH v4 02/10] drm/panfrost: Handle inexistent GPU during probe

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Message-ID: <20251001125130.76c134ae@fedora>
Date: Wed, 1 Oct 2025 12:51:30 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, Steven
 Price <steven.price@....com>, kernel@...labora.com, Rob Herring
 <robh@...nel.org>, 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>
Subject: Re: [PATCH v4 02/10] drm/panfrost: Handle inexistent GPU during
 probe

On Wed,  1 Oct 2025 03:20:23 +0100
Adrián Larumbe <adrian.larumbe@...labora.com> wrote:

> Just in case we're dealing with a yet not recognised device.
> 
> Reviewed-by: Steven Price <steven.price@....com>
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
>  drivers/gpu/drm/panfrost/panfrost_gpu.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> index f94337a6c302..8d049a07d393 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
> @@ -240,9 +240,10 @@ static const struct panfrost_model gpu_models[] = {
>  	/* MediaTek MT8188 Mali-G57 MC3 */
>  	GPU_MODEL(g57, 0x9093,
>  		GPU_REV(g57, 0, 0)),
> +	{0},
>  };
>  
> -static void panfrost_gpu_init_features(struct panfrost_device *pfdev)
> +static int panfrost_gpu_init_features(struct panfrost_device *pfdev)
>  {
>  	u32 gpu_id, num_js, major, minor, status, rev;
>  	const char *name = "unknown";
> @@ -327,6 +328,12 @@ static void panfrost_gpu_init_features(struct panfrost_device *pfdev)
>  		break;
>  	}
>  
> +	if (!model->name) {
> +		dev_err(pfdev->base.dev, "GPU model not found: mali-%s id rev %#x %#x\n",
> +			name, gpu_id, rev);
> +		return -ENODEV;
> +	}
> +
>  	bitmap_from_u64(pfdev->features.hw_features, hw_feat);
>  	bitmap_from_u64(pfdev->features.hw_issues, hw_issues);
>  
> @@ -347,6 +354,8 @@ static void panfrost_gpu_init_features(struct panfrost_device *pfdev)
>  
>  	dev_info(pfdev->base.dev, "shader_present=0x%0llx l2_present=0x%0llx",
>  		 pfdev->features.shader_present, pfdev->features.l2_present);
> +
> +	return 0;
>  }
>  
>  void panfrost_cycle_counter_get(struct panfrost_device *pfdev)
> @@ -489,7 +498,9 @@ int panfrost_gpu_init(struct panfrost_device *pfdev)
>  	if (err)
>  		return err;
>  
> -	panfrost_gpu_init_features(pfdev);
> +	err = panfrost_gpu_init_features(pfdev);
> +	if (err)
> +		return err;
>  
>  	err = dma_set_mask_and_coherent(pfdev->base.dev,
>  					DMA_BIT_MASK(FIELD_GET(0xff00,