drm/ast: cursor: Add support for ARGB4444

Add support for cursor image data in ARGB4444 format. This is the
hardware's native format and requires no conversion.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250217122336.230067-4-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 8ab006e6bc323637e879220b756d8756f8b8164a..91da54a4d8a6def3f1a97ffd859a760ca1ad828d 100644 (file)
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -720,6 +720,7 @@ static void ast_set_cursor_enabled(struct ast_device *ast, bool enabled)
 }
 
 static const uint32_t ast_cursor_plane_formats[] = {
+       DRM_FORMAT_ARGB4444,
        DRM_FORMAT_ARGB8888,
 };
 
@@ -771,17 +772,28 @@ static void ast_cursor_plane_helper_atomic_update(struct drm_plane *plane,
         */
 
        if (drm_atomic_helper_damage_merged(old_plane_state, plane_state, &damage)) {
-               u8 *argb4444 = ast_cursor_plane->argb4444;
-               struct iosys_map argb4444_dst[DRM_FORMAT_MAX_PLANES] = {
-                       IOSYS_MAP_INIT_VADDR(argb4444),
-               };
-               unsigned int argb4444_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
-                       AST_HWC_PITCH,
-               };
-
-               drm_fb_argb8888_to_argb4444(argb4444_dst, argb4444_dst_pitch,
-                                           shadow_plane_state->data, fb, &damage,
-                                           &shadow_plane_state->fmtcnv_state);
+               u8 *argb4444;
+
+               switch (fb->format->format) {
+               case DRM_FORMAT_ARGB4444:
+                       argb4444 = shadow_plane_state->data[0].vaddr;
+                       break;
+               default:
+                       argb4444 = ast_cursor_plane->argb4444;
+                       {
+                               struct iosys_map argb4444_dst[DRM_FORMAT_MAX_PLANES] = {
+                                       IOSYS_MAP_INIT_VADDR(argb4444),
+                               };
+                               unsigned int argb4444_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
+                                       AST_HWC_PITCH,
+                               };
+
+                               drm_fb_argb8888_to_argb4444(argb4444_dst, argb4444_dst_pitch,
+                                                           shadow_plane_state->data, fb, &damage,
+                                                           &shadow_plane_state->fmtcnv_state);
+                       }
+                       break;
+               }
                ast_set_cursor_image(ast, argb4444, fb->width, fb->height);
                ast_set_cursor_base(ast, dst_off);
        }