linux-kernel - Re: [PATCH 1/3] drm: drm_blend.c: Add precision in drm_rotation

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Date: Mon, 15 Apr 2024 21:30:26 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Louis Chauvet <louis.chauvet@...tlin.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	seanpaul@...gle.com, marcheu@...gle.com, nicolejadeyee@...gle.com,
	pekka.paalanen@...labora.com, thomas.petazzoni@...tlin.com
Subject: Re: [PATCH 1/3] drm: drm_blend.c: Add precision in
 drm_rotation_simplify kernel doc

On Tue, Apr 09, 2024 at 12:04:05PM +0200, Louis Chauvet wrote:
> diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
> index 6e74de833466..8d4b317eb9d7 100644
> --- a/drivers/gpu/drm/drm_blend.c
> +++ b/drivers/gpu/drm/drm_blend.c
> @@ -321,6 +321,11 @@ EXPORT_SYMBOL(drm_plane_create_rotation_property);
>   * transforms the hardware supports, this function may not
>   * be able to produce a supported transform, so the caller should
>   * check the result afterwards.
> + *
> + * If the rotation is not fully supported, this function will add a rotation of 180
> + * (ROTATE_90 would become ROTATE_270) and add a reflection on X and Y.
> + * The resulting transformation is the same (REFLECT_X | REFLECT_Y | ROTATE_180
> + * is a no-op), but some unsupported flags are removed.
>   */
>  unsigned int drm_rotation_simplify(unsigned int rotation,
>  				   unsigned int supported_rotations)
> 

The wording LGTM, thanks!

Reviewed-by: Bagas Sanjaya <bagasdotme@...il.com>

-- 
An old man doll... just what I always wanted! - Clara

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