linux-kernel - Re: [PATCH v1 03/10] drm/panthor: Introduce framework for architecture-specific features

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Message-ID: <a753688e-8ab2-4db6-8462-11b52a642081@arm.com>
Date: Mon, 20 Oct 2025 10:06:43 +0100
From: Steven Price <steven.price@....com>
To: Karunika Choo <karunika.choo@....com>, dri-devel@...ts.freedesktop.org
Cc: nd@....com, Boris Brezillon <boris.brezillon@...labora.com>,
 Liviu Dudau <liviu.dudau@....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>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 03/10] drm/panthor: Introduce framework for
 architecture-specific features

On 14/10/2025 10:43, Karunika Choo wrote:
> Add a framework to support architecture-specific features. This allows
> other parts of the driver to adjust their behaviour based on the feature
> bits enabled for a given architecture.
> 
> Signed-off-by: Karunika Choo <karunika.choo@....com>

Reviewed-by: Steven Price <steven.price@....com>

> ---
>  drivers/gpu/drm/panthor/panthor_hw.c |  5 +++++
>  drivers/gpu/drm/panthor/panthor_hw.h | 18 ++++++++++++++++++
>  2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_hw.c b/drivers/gpu/drm/panthor/panthor_hw.c
> index b6e7401327c3..34536526384d 100644
> --- a/drivers/gpu/drm/panthor/panthor_hw.c
> +++ b/drivers/gpu/drm/panthor/panthor_hw.c
> @@ -186,3 +186,8 @@ int panthor_hw_init(struct panthor_device *ptdev)
>  
>  	return 0;
>  }
> +
> +bool panthor_hw_has_feature(struct panthor_device *ptdev, enum panthor_hw_feature feature)
> +{
> +	return test_bit(feature, ptdev->hw->features);
> +}
> diff --git a/drivers/gpu/drm/panthor/panthor_hw.h b/drivers/gpu/drm/panthor/panthor_hw.h
> index 39752de3e7ad..7a191e76aeec 100644
> --- a/drivers/gpu/drm/panthor/panthor_hw.h
> +++ b/drivers/gpu/drm/panthor/panthor_hw.h
> @@ -4,14 +4,32 @@
>  #ifndef __PANTHOR_HW_H__
>  #define __PANTHOR_HW_H__
>  
> +#include <linux/types.h>
> +
>  struct panthor_device;
>  
> +/**
> + * enum panthor_hw_feature - Bit position of each HW feature
> + *
> + * Used to define GPU specific features based on the GPU architecture ID.
> + * New feature flags will be added with support for newer GPU architectures.
> + */
> +enum panthor_hw_feature {
> +	/** @PANTHOR_HW_FEATURES_END: Must be last. */
> +	PANTHOR_HW_FEATURES_END
> +};
> +
> +
>  /**
>   * struct panthor_hw - GPU specific register mapping and functions
>   */
>  struct panthor_hw {
> +	/** @features: Bitmap containing panthor_hw_feature */
> +	DECLARE_BITMAP(features, PANTHOR_HW_FEATURES_END);
>  };
>  
>  int panthor_hw_init(struct panthor_device *ptdev);
>  
> +bool panthor_hw_has_feature(struct panthor_device *ptdev, enum panthor_hw_feature feature);
> +
>  #endif /* __PANTHOR_HW_H__ */