Re: [PATCH 06/12] drm/format-helper: Rework XRGB8888-to-RGB888 conversion

[Sam Ravnborg <sam@ravnborg.org>]

On Wed, Jul 27, 2022 at 01:33:06PM +0200, Thomas Zimmermann wrote:
> Update XRGB8888-to-RGB888 conversion to support struct iosys_map
> and convert all users. Although these are single-plane color formats,
> the new interface supports multi-plane formats for consistency with
> drm_fb_blit().
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
> ---
>  drivers/gpu/drm/drm_format_helper.c | 48 ++++++++++++-----------------
>  drivers/gpu/drm/gud/gud_pipe.c      |  2 +-
>  drivers/gpu/drm/tiny/cirrus.c       |  3 +-
>  include/drm/drm_format_helper.h     |  8 ++---
>  4 files changed, 25 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
> index 8bf5655f5ce0..4edab44336d8 100644
> --- a/drivers/gpu/drm/drm_format_helper.c
> +++ b/drivers/gpu/drm/drm_format_helper.c
> @@ -383,41 +383,34 @@ static void drm_fb_xrgb8888_to_rgb888_line(void *dbuf, const void *sbuf, unsigne
>  
>  /**
>   * drm_fb_xrgb8888_to_rgb888 - Convert XRGB8888 to RGB888 clip buffer
> - * @dst: RGB888 destination buffer
> - * @dst_pitch: Number of bytes between two consecutive scanlines within dst
> - * @src: XRGB8888 source buffer
> + * @dst: Array of RGB888 destination buffers
> + * @dst_pitch: Array of numbers of bytes between two consecutive scanlines within dst
> + * @vmap: Array of XRGB8888 source buffers
>   * @fb: DRM framebuffer
>   * @clip: Clip rectangle area to copy
>   *
>   * Drivers can use this function for RGB888 devices that don't natively
>   * support XRGB8888.
>   */
> -void drm_fb_xrgb8888_to_rgb888(void *dst, unsigned int dst_pitch, const void *src,
> -			       const struct drm_framebuffer *fb, const struct drm_rect *clip)
> +void drm_fb_xrgb8888_to_rgb888(struct iosys_map *dst, const unsigned int *dst_pitch,
> +			       const struct iosys_map *vmap, const struct drm_framebuffer *fb,
> +			       const struct drm_rect *clip)
>  {
> -	drm_fb_xfrm(dst, dst_pitch, 3, src, fb, clip, false, drm_fb_xrgb8888_to_rgb888_line);
> -}
> -EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
> +	static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
> +		0, 0, 0, 0
> +	};
>  
> -/**
> - * drm_fb_xrgb8888_to_rgb888_toio - Convert XRGB8888 to RGB888 clip buffer
> - * @dst: RGB565 destination buffer (iomem)
> - * @dst_pitch: Number of bytes between two consecutive scanlines within dst
> - * @vaddr: XRGB8888 source buffer
> - * @fb: DRM framebuffer
> - * @clip: Clip rectangle area to copy
> - *
> - * Drivers can use this function for RGB888 devices that don't natively
> - * support XRGB8888.
> - */
> -void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch,
> -				    const void *vaddr, const struct drm_framebuffer *fb,
> -				    const struct drm_rect *clip)
> -{
> -	drm_fb_xfrm_toio(dst, dst_pitch, 3, vaddr, fb, clip, false,
> -			 drm_fb_xrgb8888_to_rgb888_line);
> +	if (!dst_pitch)
> +		dst_pitch = default_dst_pitch;
> +
> +	if (dst[0].is_iomem)
> +		drm_fb_xfrm_toio(dst[0].vaddr_iomem, dst_pitch[0], 3, vmap[0].vaddr, fb,
> +				 clip, false, drm_fb_xrgb8888_to_rgb888_line);
> +	else
> +		drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], 3, vmap[0].vaddr, fb,
> +			    clip, false, drm_fb_xrgb8888_to_rgb888_line);
>  }
> -EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_toio);
> +EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
>  
>  static void drm_fb_rgb565_to_xrgb8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
>  {
> @@ -598,8 +591,7 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d
>  		}
>  	} else if (dst_format == DRM_FORMAT_RGB888) {
>  		if (fb_format == DRM_FORMAT_XRGB8888) {
> -			drm_fb_xrgb8888_to_rgb888_toio(dst[0].vaddr_iomem, dst_pitch[0],
> -						       vmap[0].vaddr, fb, clip);
> +			drm_fb_xrgb8888_to_rgb888(dst, dst_pitch, vmap, fb, clip);
>  			return 0;
>  		}
>  	} else if (dst_format == DRM_FORMAT_XRGB8888) {
> diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c
> index a43eb6645352..0caa228f736d 100644
> --- a/drivers/gpu/drm/gud/gud_pipe.c
> +++ b/drivers/gpu/drm/gud/gud_pipe.c
> @@ -201,7 +201,7 @@ static int gud_prep_flush(struct gud_device *gdrm, struct drm_framebuffer *fb,
>  			drm_fb_xrgb8888_to_rgb565(&dst, NULL, map_data, fb, rect,
>  						  gud_is_big_endian());
>  		} else if (format->format == DRM_FORMAT_RGB888) {
> -			drm_fb_xrgb8888_to_rgb888(buf, 0, vaddr, fb, rect);
> +			drm_fb_xrgb8888_to_rgb888(&dst, NULL, map_data, fb, rect);
>  		} else {
>  			len = gud_xrgb8888_to_color(buf, format, vaddr, fb, rect);
>  		}
> diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
> index 9cd398e4700b..354d5e854a6f 100644
> --- a/drivers/gpu/drm/tiny/cirrus.c
> +++ b/drivers/gpu/drm/tiny/cirrus.c
> @@ -321,7 +321,6 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
>  {
>  	struct cirrus_device *cirrus = to_cirrus(fb->dev);
>  	struct iosys_map dst;
> -	void *vaddr = vmap->vaddr; /* TODO: Use mapping abstraction properly */
>  	int idx;
>  
>  	if (!drm_dev_enter(&cirrus->dev, &idx))
> @@ -339,7 +338,7 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
>  
>  	} else if (fb->format->cpp[0] == 4 && cirrus->cpp == 3) {
>  		iosys_map_incr(&dst, drm_fb_clip_offset(cirrus->pitch, fb->format, rect));
> -		drm_fb_xrgb8888_to_rgb888_toio(dst.vaddr_iomem, cirrus->pitch, vaddr, fb, rect);
> +		drm_fb_xrgb8888_to_rgb888(&dst, &cirrus->pitch, vmap, fb, rect);
>  
>  	} else {
>  		WARN_ON_ONCE("cpp mismatch");
> diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
> index 9f1d45d7ce84..8c633dbab5d6 100644
> --- a/include/drm/drm_format_helper.h
> +++ b/include/drm/drm_format_helper.h
> @@ -26,11 +26,9 @@ void drm_fb_xrgb8888_to_rgb332(struct iosys_map *dst, const unsigned int *dst_pi
>  void drm_fb_xrgb8888_to_rgb565(struct iosys_map *dst, const unsigned int *dst_pitch,
>  			       const struct iosys_map *vmap, const struct drm_framebuffer *fb,
>  			       const struct drm_rect *clip, bool swab);
> -void drm_fb_xrgb8888_to_rgb888(void *dst, unsigned int dst_pitch, const void *src,
> -			       const struct drm_framebuffer *fb, const struct drm_rect *clip);
> -void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch,
> -				    const void *vaddr, const struct drm_framebuffer *fb,
> -				    const struct drm_rect *clip);
> +void drm_fb_xrgb8888_to_rgb888(struct iosys_map *dst, const unsigned int *dst_pitch,
> +			       const struct iosys_map *vmap, const struct drm_framebuffer *fb,
> +			       const struct drm_rect *clip);
>  void drm_fb_xrgb8888_to_xrgb2101010_toio(void __iomem *dst, unsigned int dst_pitch,
>  					 const void *vaddr, const struct drm_framebuffer *fb,
>  					 const struct drm_rect *clip);
> -- 
> 2.37.1