drm/ast: Support cursor buffers objects in I/O memory

Copy the ARGB4444 cursor buffer to system memory if it is located in
I/O memory. While this cannot happen with ast's native GEM objects, an
imported buffer object might be on the external device's I/O memory.

If the cursor buffer is located in system memory continue to use it
directly.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>>
Link: https://patch.msgid.link/20251126094626.41985-3-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/ast/ast_cursor.c b/drivers/gpu/drm/ast/ast_cursor.c
index 24d696df8fcda657f1dc08b3e44152d7945d203f..8d473ed2738cf68202c22ba56f21bffc7f3643da 100644 (file)
--- a/drivers/gpu/drm/ast/ast_cursor.c
+++ b/drivers/gpu/drm/ast/ast_cursor.c
@@ -191,7 +191,20 @@ static const u8 *ast_cursor_plane_get_argb4444(struct ast_cursor_plane *ast_curs
 
        switch (fb->format->format) {
        case DRM_FORMAT_ARGB4444:
-               argb4444 = shadow_plane_state->data[0].vaddr;
+               if (shadow_plane_state->data[0].is_iomem) {
+                       struct iosys_map argb4444_dst[DRM_FORMAT_MAX_PLANES] = {
+                               IOSYS_MAP_INIT_VADDR(ast_cursor_plane->argb4444),
+                       };
+                       unsigned int argb4444_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
+                               AST_HWC_PITCH,
+                       };
+
+                       drm_fb_memcpy(argb4444_dst, argb4444_dst_pitch,
+                                     shadow_plane_state->data, fb, clip);
+                       argb4444 = argb4444_dst[0].vaddr;
+               } else {
+                       argb4444 = shadow_plane_state->data[0].vaddr;
+               }
                break;
        case DRM_FORMAT_ARGB8888:
                {