linux-kernel - Re: [PATCH v2 3/7] drm/vkms: Add range and encoding properties to pixel

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Message-ID: <ZbvYZHCt6ynnWkoP@localhost.localdomain>
Date: Thu, 1 Feb 2024 18:44:04 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Arthur Grillo <arthurgrillo@...eup.net>
Cc: Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>,
	Haneen Mohammed <hamohammed.sa@...il.com>,
	Harry Wentland <harry.wentland@....com>,
	Jonathan Corbet <corbet@....net>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Maíra Canal <mairacanal@...eup.net>,
	Melissa Wen <melissa.srw@...il.com>,
	Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 3/7] drm/vkms: Add range and encoding properties to
 pixel_read function

Le 10/01/24 - 14:44, Arthur Grillo a écrit :
> Create range and encoding properties. This should be noop, as none of
> the conversion functions need those properties.
> 
> Signed-off-by: Arthur Grillo <arthurgrillo@...eup.net>
> ---
>  drivers/gpu/drm/vkms/vkms_drv.h     |  3 ++-
>  drivers/gpu/drm/vkms/vkms_formats.c | 20 ++++++++++++++------
>  drivers/gpu/drm/vkms/vkms_plane.c   |  9 +++++++++
>  3 files changed, 25 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index c38590562e4b..51349a0c32d8 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -56,7 +56,8 @@ struct vkms_writeback_job {
>  struct vkms_plane_state {
>  	struct drm_shadow_plane_state base;
>  	struct vkms_frame_info *frame_info;
> -	void (*pixel_read)(u8 **src_buffer, struct pixel_argb_u16 *out_pixel);
> +	void (*pixel_read)(u8 **src_buffer, struct pixel_argb_u16 *out_pixel,
> +			   enum drm_color_encoding enconding, enum drm_color_range range);
>  };
>  
>  struct vkms_plane {
> diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
> index 5566a7cd7bb4..0156372aa1ef 100644
> --- a/drivers/gpu/drm/vkms/vkms_formats.c
> +++ b/drivers/gpu/drm/vkms/vkms_formats.c
> @@ -51,7 +51,8 @@ static int get_x_position(const struct vkms_frame_info *frame_info, int limit, i
>  	return x;
>  }
>  
> -static void ARGB8888_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel)
> +static void ARGB8888_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel,
> +				 enum drm_color_encoding encoding, enum drm_color_range range)
>  {
>  	/*
>  	 * The 257 is the "conversion ratio". This number is obtained by the
> @@ -65,7 +66,8 @@ static void ARGB8888_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pix
>  	out_pixel->b = (u16)src_pixels[0][0] * 257;
>  }
>  
> -static void XRGB8888_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel)
> +static void XRGB8888_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel,
> +				 enum drm_color_encoding encoding, enum drm_color_range range)
>  {
>  	out_pixel->a = (u16)0xffff;
>  	out_pixel->r = (u16)src_pixels[0][2] * 257;
> @@ -73,7 +75,8 @@ static void XRGB8888_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pix
>  	out_pixel->b = (u16)src_pixels[0][0] * 257;
>  }
>  
> -static void ARGB16161616_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel)
> +static void ARGB16161616_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel,
> +				     enum drm_color_encoding encoding, enum drm_color_range range)
>  {
>  	u16 *pixels = (u16 *)src_pixels[0];
>  
> @@ -83,7 +86,8 @@ static void ARGB16161616_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out
>  	out_pixel->b = le16_to_cpu(pixels[0]);
>  }
>  
> -static void XRGB16161616_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel)
> +static void XRGB16161616_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel,
> +				     enum drm_color_encoding encoding, enum drm_color_range range)
>  {
>  	u16 *pixels = (u16 *)src_pixels[0];
>  
> @@ -93,7 +97,8 @@ static void XRGB16161616_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out
>  	out_pixel->b = le16_to_cpu(pixels[0]);
>  }
>  
> -static void RGB565_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel)
> +static void RGB565_to_argb_u16(u8 **src_pixels, struct pixel_argb_u16 *out_pixel,
> +			       enum drm_color_encoding encoding, enum drm_color_range range)
>  {
>  	u16 *pixels = (u16 *)src_pixels[0];
>  
> @@ -132,6 +137,9 @@ void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state
>  	int limit = min_t(size_t, drm_rect_width(&frame_info->dst), stage_buffer->n_pixels);
>  	u8 *src_pixels[DRM_FORMAT_MAX_PLANES];
>  
> +	enum drm_color_encoding encoding = plane->base.base.color_encoding;
> +	enum drm_color_range range = plane->base.base.color_range;
> +
>  	for (size_t i = 0; i < frame_format->num_planes; i++)
>  		src_pixels[i] = get_packed_src_addr(frame_info, y, i);
>  
> @@ -146,7 +154,7 @@ void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state
>  			}
>  		}
>  
> -		plane->pixel_read(src_pixels, &out_pixels[x_pos]);
> +		plane->pixel_read(src_pixels, &out_pixels[x_pos], encoding, range);
>  
>  		for (size_t i = 0; i < frame_format->num_planes; i++)
>  			src_pixels[i] += frame_format->cpp[i];
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index 8f2c6ea419a3..e87c80575b7d 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -212,5 +212,14 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
>  	drm_plane_create_rotation_property(&plane->base, DRM_MODE_ROTATE_0,
>  					   DRM_MODE_ROTATE_MASK | DRM_MODE_REFLECT_MASK);
>  
> +	drm_plane_create_color_properties(&plane->base,
> +					  BIT(DRM_COLOR_YCBCR_BT601) |
> +					  BIT(DRM_COLOR_YCBCR_BT709) |
> +					  BIT(DRM_COLOR_YCBCR_BT2020),
> +					  BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
> +					  BIT(DRM_COLOR_YCBCR_FULL_RANGE),
> +					  DRM_COLOR_YCBCR_BT601,
> +					  DRM_COLOR_YCBCR_FULL_RANGE);
> +
>  	return plane;
>  }
> 
> -- 
> 2.43.0
> 

Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.com>