drm/format-helper: Remove drm_fb_blit()

The function is unused; remove it.

Instead of relying on a general blit helper, drivers should pick a blit
function by themselves from their list of supported color formats.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Javier Martinez Canillas <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/drm_format_helper.c

···
 }
 EXPORT_SYMBOL(drm_fb_argb8888_to_argb4444);
 
-/**
- * drm_fb_blit - Copy parts of a framebuffer to display memory
- * @dst:	Array of display-memory addresses to copy to
- * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
- *             within @dst; can be NULL if scanlines are stored next to each other.
- * @dst_format:	FOURCC code of the display's color format
- * @src:	The framebuffer memory to copy from
- * @fb:		The framebuffer to copy from
- * @clip:	Clip rectangle area to copy
- * @state: Transform and conversion state
- *
- * This function copies parts of a framebuffer to display memory. If the
- * formats of the display and the framebuffer mismatch, the blit function
- * will attempt to convert between them during the process. The parameters @dst,
- * @dst_pitch and @src refer to arrays. Each array must have at least as many
- * entries as there are planes in @dst_format's format. Each entry stores the
- * value for the format's respective color plane at the same index.
- *
- * This function does not apply clipping on @dst (i.e. the destination is at the
- * top-left corner).
- *
- * Returns:
- * 0 on success, or
- * -EINVAL if the color-format conversion failed, or
- * a negative error code otherwise.
- */
-int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t dst_format,
-		const struct iosys_map *src, const struct drm_framebuffer *fb,
-		const struct drm_rect *clip, struct drm_format_conv_state *state)
-{
-	uint32_t fb_format = fb->format->format;
-
-	if (fb_format == dst_format) {
-		drm_fb_memcpy(dst, dst_pitch, src, fb, clip);
-		return 0;
-	} else if (fb_format == (dst_format | DRM_FORMAT_BIG_ENDIAN)) {
-		drm_fb_swab(dst, dst_pitch, src, fb, clip, false, state);
-		return 0;
-	} else if (fb_format == (dst_format & ~DRM_FORMAT_BIG_ENDIAN)) {
-		drm_fb_swab(dst, dst_pitch, src, fb, clip, false, state);
-		return 0;
-	} else if (fb_format == DRM_FORMAT_XRGB8888) {
-		if (dst_format == DRM_FORMAT_RGB565) {
-			drm_fb_xrgb8888_to_rgb565(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_XRGB1555) {
-			drm_fb_xrgb8888_to_xrgb1555(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_ARGB1555) {
-			drm_fb_xrgb8888_to_argb1555(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_RGBA5551) {
-			drm_fb_xrgb8888_to_rgba5551(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_RGB888) {
-			drm_fb_xrgb8888_to_rgb888(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_BGR888) {
-			drm_fb_xrgb8888_to_bgr888(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_ARGB8888) {
-			drm_fb_xrgb8888_to_argb8888(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_XBGR8888) {
-			drm_fb_xrgb8888_to_xbgr8888(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_ABGR8888) {
-			drm_fb_xrgb8888_to_abgr8888(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_XRGB2101010) {
-			drm_fb_xrgb8888_to_xrgb2101010(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_ARGB2101010) {
-			drm_fb_xrgb8888_to_argb2101010(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_BGRX8888) {
-			drm_fb_swab(dst, dst_pitch, src, fb, clip, false, state);
-			return 0;
-		} else if (dst_format == DRM_FORMAT_RGB332) {
-			drm_fb_xrgb8888_to_rgb332(dst, dst_pitch, src, fb, clip, state);
-			return 0;
-		}
-	}
-
-	drm_warn_once(fb->dev, "No conversion helper from %p4cc to %p4cc found.\n",
-		      &fb_format, &dst_format);
-
-	return -EINVAL;
-}
-EXPORT_SYMBOL(drm_fb_blit);
-
 static void drm_fb_gray8_to_gray2_line(void *dbuf, const void *sbuf, unsigned int pixels)
 {
 	u8 *dbuf8 = dbuf;

include/drm/drm_format_helper.h

···
 				 const struct iosys_map *src, const struct drm_framebuffer *fb,
 				 const struct drm_rect *clip, struct drm_format_conv_state *state);
 
-int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t dst_format,
-		const struct iosys_map *src, const struct drm_framebuffer *fb,
-		const struct drm_rect *clip, struct drm_format_conv_state *state);
-
 void drm_fb_xrgb8888_to_mono(struct iosys_map *dst, const unsigned int *dst_pitch,
 			     const struct iosys_map *src, const struct drm_framebuffer *fb,
 			     const struct drm_rect *clip, struct drm_format_conv_state *state);