drm/format-helper: Add blitter functions

The blitter functions copy a framebuffer to I/O memory using one of
the existing conversion functions.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: nerdopolis <bluescreen_avenger@verizon.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-3-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index 8d5a683..0e885cd 100644 (file)
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -344,3 +344,90 @@ void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
 }
 EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
 
+/**
+ * drm_fb_blit_rect_dstclip - Copy parts of a framebuffer to display memory
+ * @dst:       The display memory to copy to
+ * @dst_pitch: Number of bytes between two consecutive scanlines within dst
+ * @dst_format:        FOURCC code of the display's color format
+ * @vmap:      The framebuffer memory to copy from
+ * @fb:                The framebuffer to copy from
+ * @clip:      Clip rectangle area to copy
+ *
+ * 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.
+ *
+ * Use drm_fb_blit_dstclip() to copy the full framebuffer.
+ *
+ * Returns:
+ * 0 on success, or
+ * -EINVAL if the color-format conversion failed, or
+ * a negative error code otherwise.
+ */
+int drm_fb_blit_rect_dstclip(void __iomem *dst, unsigned int dst_pitch,
+                            uint32_t dst_format, void *vmap,
+                            struct drm_framebuffer *fb,
+                            struct drm_rect *clip)
+{
+       uint32_t fb_format = fb->format->format;
+
+       /* treat alpha channel like filler bits */
+       if (fb_format == DRM_FORMAT_ARGB8888)
+               fb_format = DRM_FORMAT_XRGB8888;
+       if (dst_format == DRM_FORMAT_ARGB8888)
+               dst_format = DRM_FORMAT_XRGB8888;
+
+       if (dst_format == fb_format) {
+               drm_fb_memcpy_dstclip(dst, dst_pitch, vmap, fb, clip);
+               return 0;
+
+       } else if (dst_format == DRM_FORMAT_RGB565) {
+               if (fb_format == DRM_FORMAT_XRGB8888) {
+                       drm_fb_xrgb8888_to_rgb565_dstclip(dst, dst_pitch,
+                                                         vmap, fb, clip,
+                                                         false);
+                       return 0;
+               }
+       } else if (dst_format == DRM_FORMAT_RGB888) {
+               if (fb_format == DRM_FORMAT_XRGB8888) {
+                       drm_fb_xrgb8888_to_rgb888_dstclip(dst, dst_pitch,
+                                                         vmap, fb, clip);
+                       return 0;
+               }
+       }
+
+       return -EINVAL;
+}
+EXPORT_SYMBOL(drm_fb_blit_rect_dstclip);
+
+/**
+ * drm_fb_blit_dstclip - Copy framebuffer to display memory
+ * @dst:       The display memory to copy to
+ * @dst_pitch: Number of bytes between two consecutive scanlines within dst
+ * @dst_format:        FOURCC code of the display's color format
+ * @vmap:      The framebuffer memory to copy from
+ * @fb:                The framebuffer to copy from
+ *
+ * This function copies a full framebuffer to display memory. If the formats
+ * of the display and the framebuffer mismatch, the copy function will
+ * attempt to convert between them.
+ *
+ * See drm_fb_blit_rect_dstclip() for more inforamtion.
+ *
+ * Returns:
+ * 0 on success, or a negative error code otherwise.
+ */
+int drm_fb_blit_dstclip(void __iomem *dst, unsigned int dst_pitch,
+                       uint32_t dst_format, void *vmap,
+                       struct drm_framebuffer *fb)
+{
+       struct drm_rect fullscreen = {
+               .x1 = 0,
+               .x2 = fb->width,
+               .y1 = 0,
+               .y2 = fb->height,
+       };
+       return drm_fb_blit_rect_dstclip(dst, dst_pitch, dst_format, vmap, fb,
+                                       &fullscreen);
+}
+EXPORT_SYMBOL(drm_fb_blit_dstclip);

diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 2b5036a..4e0258a 100644 (file)
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -28,4 +28,12 @@ void drm_fb_xrgb8888_to_rgb888_dstclip(void __iomem *dst, unsigned int dst_pitch
 void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
                              struct drm_rect *clip);
 
+int drm_fb_blit_rect_dstclip(void __iomem *dst, unsigned int dst_pitch,
+                            uint32_t dst_format, void *vmap,
+                            struct drm_framebuffer *fb,
+                            struct drm_rect *rect);
+int drm_fb_blit_dstclip(void __iomem *dst, unsigned int dst_pitch,
+                       uint32_t dst_format, void *vmap,
+                       struct drm_framebuffer *fb);
+
 #endif /* __LINUX_DRM_FORMAT_HELPER_H */