Re: [PATCH 04/12] drm/format-helper: Rework XRGB8888-to-RGBG332 conversion

[Sam Ravnborg <sam@ravnborg.org>]

Hi Thomas,

On Wed, Jul 27, 2022 at 01:33:04PM +0200, Thomas Zimmermann wrote:
> Update XRGB8888-to-RGB332 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>

I am not going to repeat my naming rant here, so
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

> ---
>  drivers/gpu/drm/drm_format_helper.c           | 25 ++++++++++++++-----
>  drivers/gpu/drm/gud/gud_pipe.c                |  2 +-
>  .../gpu/drm/tests/drm_format_helper_test.c    | 14 ++++++-----
>  include/drm/drm_format_helper.h               |  5 ++--
>  4 files changed, 31 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
> index fa22d3cb11e8..2b5c3746ff4a 100644
> --- a/drivers/gpu/drm/drm_format_helper.c
> +++ b/drivers/gpu/drm/drm_format_helper.c
> @@ -265,18 +265,31 @@ static void drm_fb_xrgb8888_to_rgb332_line(void *dbuf, const void *sbuf, unsigne
>  
>  /**
>   * drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer
> - * @dst: RGB332 destination buffer
> - * @dst_pitch: Number of bytes between two consecutive scanlines within dst
> - * @src: XRGB8888 source buffer
> + * @dst: Array of RGB332 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 RGB332 devices that don't natively support XRGB8888.
>   */
> -void drm_fb_xrgb8888_to_rgb332(void *dst, unsigned int dst_pitch, const void *src,
> -			       const struct drm_framebuffer *fb, const struct drm_rect *clip)
> +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)
>  {
> -	drm_fb_xfrm(dst, dst_pitch, 1, src, fb, clip, false, drm_fb_xrgb8888_to_rgb332_line);
> +	static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
> +		0, 0, 0, 0
> +	};
> +
> +	if (!dst_pitch)
> +		dst_pitch = default_dst_pitch;
> +
> +	if (dst[0].is_iomem)
> +		drm_fb_xfrm_toio(dst[0].vaddr_iomem, dst_pitch[0], 1, vmap[0].vaddr, fb, clip,
> +				 false, drm_fb_xrgb8888_to_rgb332_line);
> +	else
> +		drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], 1, vmap[0].vaddr, fb, clip,
> +			    false, drm_fb_xrgb8888_to_rgb332_line);
>  }
>  EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb332);
>  
> diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c
> index a15cda9ba058..426a3ae6cc50 100644
> --- a/drivers/gpu/drm/gud/gud_pipe.c
> +++ b/drivers/gpu/drm/gud/gud_pipe.c
> @@ -196,7 +196,7 @@ static int gud_prep_flush(struct gud_device *gdrm, struct drm_framebuffer *fb,
>  		} else if (format->format == DRM_FORMAT_R8) {
>  			drm_fb_xrgb8888_to_gray8(buf, 0, vaddr, fb, rect);
>  		} else if (format->format == DRM_FORMAT_RGB332) {
> -			drm_fb_xrgb8888_to_rgb332(buf, 0, vaddr, fb, rect);
> +			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());
>  		} else if (format->format == DRM_FORMAT_RGB888) {
> diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> index 98583bf56044..b74dba06f704 100644
> --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> @@ -124,7 +124,8 @@ static void xrgb8888_to_rgb332_test(struct kunit *test)
>  {
>  	const struct xrgb8888_to_rgb332_case *params = test->param_value;
>  	size_t dst_size;
> -	__u8 *dst = NULL;
> +	struct iosys_map dst, xrgb8888;
> +	__u8 *buf = NULL;
>  
>  	struct drm_framebuffer fb = {
>  		.format = drm_format_info(DRM_FORMAT_XRGB8888),
> @@ -135,12 +136,13 @@ static void xrgb8888_to_rgb332_test(struct kunit *test)
>  				       &params->clip);
>  	KUNIT_ASSERT_GT(test, dst_size, 0);
>  
> -	dst = kunit_kzalloc(test, dst_size, GFP_KERNEL);
> -	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dst);
> +	buf = kunit_kzalloc(test, dst_size, GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
>  
> -	drm_fb_xrgb8888_to_rgb332(dst, params->dst_pitch, params->xrgb8888,
> -				  &fb, &params->clip);
> -	KUNIT_EXPECT_EQ(test, memcmp(dst, params->expected, dst_size), 0);
> +	iosys_map_set_vaddr(&dst, buf);
> +	iosys_map_set_vaddr(&xrgb8888, (void __force *)params->xrgb8888);
> +	drm_fb_xrgb8888_to_rgb332(&dst, &params->dst_pitch, &xrgb8888, &fb, &params->clip);
> +	KUNIT_EXPECT_EQ(test, memcmp(buf, params->expected, dst_size), 0);
>  }
>  
>  static struct kunit_case drm_format_helper_test_cases[] = {
> diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
> index 60944feaa936..3c28f099e3ed 100644
> --- a/include/drm/drm_format_helper.h
> +++ b/include/drm/drm_format_helper.h
> @@ -20,8 +20,9 @@ void drm_fb_memcpy(struct iosys_map *dst, const unsigned int *dst_pitch,
>  void drm_fb_swab(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 cached);
> -void drm_fb_xrgb8888_to_rgb332(void *dst, unsigned int dst_pitch, const void *vaddr,
> -			       const struct drm_framebuffer *fb, const struct drm_rect *clip);
> +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);
> -- 
> 2.37.1