Re: [PATCH 05/12] drm/format-helper: Rework XRGB8888-to-RGBG565 conversion

["José Expósito" <jose.exposito89@gmail.com>]

Hi Thomas,

On Wed, Jul 27, 2022 at 01:33:05PM +0200, Thomas Zimmermann wrote:
> Update XRGB8888-to-RGB565 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>

Tested-by: José Expósito <jose.exposito89@gmail.com>
Reviewed-by: José Expósito <jose.exposito89@gmail.com>

In order to continue working on the missing tests for drm_format_helper
I rebased your series on top of drm-misc-next and fixed the conflicts
in the tests [1]. It is an easy fix, but feel free to copy & paste the
code if you want to save a couple of minutes.

FWIW, I ran the existing test for RGB565 on little and big endian archs
and they are working as expected.

Jose

[1] https://github.com/JoseExposito/linux/commit/175af3a6b6b9b8013e9925c06b4951fffbbce15b

> ---
>  drivers/gpu/drm/drm_format_helper.c | 59 +++++++++++------------------
>  drivers/gpu/drm/drm_mipi_dbi.c      |  4 +-
>  drivers/gpu/drm/gud/gud_pipe.c      |  3 +-
>  drivers/gpu/drm/tiny/cirrus.c       |  3 +-
>  include/drm/drm_format_helper.h     |  9 ++---
>  5 files changed, 30 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
> index 2b5c3746ff4a..8bf5655f5ce0 100644
> --- a/drivers/gpu/drm/drm_format_helper.c
> +++ b/drivers/gpu/drm/drm_format_helper.c
> @@ -330,9 +330,9 @@ static void drm_fb_xrgb8888_to_rgb565_swab_line(void *dbuf, const void *sbuf,
>  
>  /**
>   * drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
> - * @dst: RGB565 destination buffer
> - * @dst_pitch: Number of bytes between two consecutive scanlines within dst
> - * @vaddr: XRGB8888 source buffer
> + * @dst: Array of RGB565 destination buffers
> + * @dst_pitch: Array of numbers of bytes between two consecutive scanlines within dst
> + * @vmap: Array of XRGB8888 source buffer
>   * @fb: DRM framebuffer
>   * @clip: Clip rectangle area to copy
>   * @swab: Swap bytes
> @@ -340,43 +340,31 @@ static void drm_fb_xrgb8888_to_rgb565_swab_line(void *dbuf, const void *sbuf,
>   * Drivers can use this function for RGB565 devices that don't natively
>   * support XRGB8888.
>   */
> -void drm_fb_xrgb8888_to_rgb565(void *dst, unsigned int dst_pitch, const void *vaddr,
> -			       const struct drm_framebuffer *fb, const struct drm_rect *clip,
> -			       bool swab)
> +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)
>  {
> +	static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
> +		0, 0, 0, 0
> +	};
> +	void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels);
> +
>  	if (swab)
> -		drm_fb_xfrm(dst, dst_pitch, 2, vaddr, fb, clip, false,
> -			    drm_fb_xrgb8888_to_rgb565_swab_line);
> +		xfrm_line = drm_fb_xrgb8888_to_rgb565_swab_line;
>  	else
> -		drm_fb_xfrm(dst, dst_pitch, 2, vaddr, fb, clip, false,
> -			    drm_fb_xrgb8888_to_rgb565_line);
> -}
> -EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
> +		xfrm_line = drm_fb_xrgb8888_to_rgb565_line;
>  
> -/**
> - * drm_fb_xrgb8888_to_rgb565_toio - Convert XRGB8888 to RGB565 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
> - * @swab: Swap bytes
> - *
> - * Drivers can use this function for RGB565 devices that don't natively
> - * support XRGB8888.
> - */
> -void drm_fb_xrgb8888_to_rgb565_toio(void __iomem *dst, unsigned int dst_pitch,
> -				    const void *vaddr, const struct drm_framebuffer *fb,
> -				    const struct drm_rect *clip, bool swab)
> -{
> -	if (swab)
> -		drm_fb_xfrm_toio(dst, dst_pitch, 2, vaddr, fb, clip, false,
> -				 drm_fb_xrgb8888_to_rgb565_swab_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], 2, vmap[0].vaddr, fb, clip,
> +				 false, xfrm_line);
>  	else
> -		drm_fb_xfrm_toio(dst, dst_pitch, 2, vaddr, fb, clip, false,
> -				 drm_fb_xrgb8888_to_rgb565_line);
> +		drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], 2, vmap[0].vaddr, fb, clip,
> +			    false, xfrm_line);
>  }
> -EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_toio);
> +EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
>  
>  static void drm_fb_xrgb8888_to_rgb888_line(void *dbuf, const void *sbuf, unsigned int pixels)
>  {
> @@ -605,8 +593,7 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d
>  
>  	} else if (dst_format == DRM_FORMAT_RGB565) {
>  		if (fb_format == DRM_FORMAT_XRGB8888) {
> -			drm_fb_xrgb8888_to_rgb565_toio(dst[0].vaddr_iomem, dst_pitch[0],
> -						       vmap[0].vaddr, fb, clip, false);
> +			drm_fb_xrgb8888_to_rgb565(dst, dst_pitch, vmap, fb, clip, false);
>  			return 0;
>  		}
>  	} else if (dst_format == DRM_FORMAT_RGB888) {
> diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
> index 973a75585cad..d0bdbcb96705 100644
> --- a/drivers/gpu/drm/drm_mipi_dbi.c
> +++ b/drivers/gpu/drm/drm_mipi_dbi.c
> @@ -206,7 +206,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>  	struct iosys_map map[DRM_FORMAT_MAX_PLANES];
>  	struct iosys_map data[DRM_FORMAT_MAX_PLANES];
>  	struct iosys_map dst_map = IOSYS_MAP_INIT_VADDR(dst);
> -	void *src;
>  	int ret;
>  
>  	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
> @@ -216,7 +215,6 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>  	ret = drm_gem_fb_vmap(fb, map, data);
>  	if (ret)
>  		goto out_drm_gem_fb_end_cpu_access;
> -	src = data[0].vaddr; /* TODO: Use mapping abstraction properly */
>  
>  	switch (fb->format->format) {
>  	case DRM_FORMAT_RGB565:
> @@ -226,7 +224,7 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>  			drm_fb_memcpy(&dst_map, NULL, data, fb, clip);
>  		break;
>  	case DRM_FORMAT_XRGB8888:
> -		drm_fb_xrgb8888_to_rgb565(dst, 0, src, fb, clip, swap);
> +		drm_fb_xrgb8888_to_rgb565(&dst_map, NULL, data, fb, clip, swap);
>  		break;
>  	default:
>  		drm_err_once(fb->dev, "Format is not supported: %p4cc\n",
> diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c
> index 426a3ae6cc50..a43eb6645352 100644
> --- a/drivers/gpu/drm/gud/gud_pipe.c
> +++ b/drivers/gpu/drm/gud/gud_pipe.c
> @@ -198,7 +198,8 @@ static int gud_prep_flush(struct gud_device *gdrm, struct drm_framebuffer *fb,
>  		} else if (format->format == DRM_FORMAT_RGB332) {
>  			drm_fb_xrgb8888_to_rgb332(&dst, NULL, map_data, fb, rect);
>  		} else if (format->format == DRM_FORMAT_RGB565) {
> -			drm_fb_xrgb8888_to_rgb565(buf, 0, vaddr, fb, rect, gud_is_big_endian());
> +			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);
>  		} else {
> diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
> index 73fb9f63d227..9cd398e4700b 100644
> --- a/drivers/gpu/drm/tiny/cirrus.c
> +++ b/drivers/gpu/drm/tiny/cirrus.c
> @@ -335,8 +335,7 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
>  
>  	} else if (fb->format->cpp[0] == 4 && cirrus->cpp == 2) {
>  		iosys_map_incr(&dst, drm_fb_clip_offset(cirrus->pitch, fb->format, rect));
> -		drm_fb_xrgb8888_to_rgb565_toio(dst.vaddr_iomem, cirrus->pitch, vaddr, fb, rect,
> -					       false);
> +		drm_fb_xrgb8888_to_rgb565(&dst, &cirrus->pitch, vmap, fb, rect, false);
>  
>  	} else if (fb->format->cpp[0] == 4 && cirrus->cpp == 3) {
>  		iosys_map_incr(&dst, drm_fb_clip_offset(cirrus->pitch, fb->format, rect));
> diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
> index 3c28f099e3ed..9f1d45d7ce84 100644
> --- a/include/drm/drm_format_helper.h
> +++ b/include/drm/drm_format_helper.h
> @@ -23,12 +23,9 @@ void drm_fb_swab(struct iosys_map *dst, const unsigned int *dst_pitch,
>  void drm_fb_xrgb8888_to_rgb332(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_rgb565(void *dst, unsigned int dst_pitch, const void *vaddr,
> -			       const struct drm_framebuffer *fb, const struct drm_rect *clip,
> -			       bool swab);
> -void drm_fb_xrgb8888_to_rgb565_toio(void __iomem *dst, unsigned int dst_pitch,
> -				    const void *vaddr, const struct drm_framebuffer *fb,
> -				    const struct drm_rect *clip, bool swab);
> +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,
> -- 
> 2.37.1
>