drm/ast: Remove vaddr field from struct ast_plane

The vaddr field in struct ast_plane serves no purpose. Its value
can be calculated easily from the VRAM base plus the plane offset.
Do so and remove the field.

In ast_primary_plane_helper_get_scanout_buffer(), remove the test
for vaddr being NULL. This cannot legally happen.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250324094520.192974-3-tzimmermann@suse.de

Author: tdz

drivers/gpu/drm/ast/ast_cursor.c

@@ -91,7 +91,7 @@ static u32 ast_cursor_calculate_checksum(const void *src, unsigned int width, un
 static void ast_set_cursor_image(struct ast_device *ast, const u8 *src,
 				 unsigned int width, unsigned int height)
 {
-	u8 __iomem *dst = ast->cursor_plane.base.vaddr;
+	u8 __iomem *dst = ast_plane_vaddr(&ast->cursor_plane.base);
 	u32 csum;
 
 	csum = ast_cursor_calculate_checksum(src, width, height);
@@ -193,7 +193,7 @@ static void ast_cursor_plane_helper_atomic_update(struct drm_plane *plane,
 	struct ast_device *ast = to_ast_device(plane->dev);
 	struct drm_rect damage;
 	u64 dst_off = ast_plane->offset;
-	u8 __iomem *dst = ast_plane->vaddr; /* TODO: Use mapping abstraction properly */
+	u8 __iomem *dst = ast_plane_vaddr(ast_plane); /* TODO: Use mapping abstraction properly */
 	u8 __iomem *sig = dst + AST_HWC_SIZE; /* TODO: Use mapping abstraction properly */
 	unsigned int offset_x, offset_y;
 	u16 x, y;
@@ -291,17 +291,15 @@ int ast_cursor_plane_init(struct ast_device *ast)
 	struct ast_plane *ast_plane = &ast_cursor_plane->base;
 	struct drm_plane *cursor_plane = &ast_plane->base;
 	unsigned long size;
-	void __iomem *vaddr;
 	long offset;
 	int ret;
 
 	size = ast_cursor_vram_size();
 	offset = ast_cursor_vram_offset(ast);
 	if (offset < 0)
 		return offset;
-	vaddr = ast->vram + offset;
 
-	ret = ast_plane_init(dev, ast_plane, vaddr, offset, size,
+	ret = ast_plane_init(dev, ast_plane, offset, size,
 			     0x01, &ast_cursor_plane_funcs,
 			     ast_cursor_plane_formats, ARRAY_SIZE(ast_cursor_plane_formats),
 			     NULL, DRM_PLANE_TYPE_CURSOR);

drivers/gpu/drm/ast/ast_drv.h

@@ -122,7 +122,6 @@ enum ast_config_mode {
 struct ast_plane {
 	struct drm_plane base;
 
-	void __iomem *vaddr;
 	u64 offset;
 	unsigned long size;
 };
@@ -443,11 +442,12 @@ int ast_astdp_output_init(struct ast_device *ast);
 /* ast_mode.c */
 int ast_mode_config_init(struct ast_device *ast);
 int ast_plane_init(struct drm_device *dev, struct ast_plane *ast_plane,
-		   void __iomem *vaddr, u64 offset, unsigned long size,
+		   u64 offset, unsigned long size,
 		   uint32_t possible_crtcs,
 		   const struct drm_plane_funcs *funcs,
 		   const uint32_t *formats, unsigned int format_count,
 		   const uint64_t *format_modifiers,
 		   enum drm_plane_type type);
+void __iomem *ast_plane_vaddr(struct ast_plane *ast);
 
 #endif

drivers/gpu/drm/ast/ast_mode.c

@@ -457,7 +457,7 @@ static void ast_wait_for_vretrace(struct ast_device *ast)
  */
 
 int ast_plane_init(struct drm_device *dev, struct ast_plane *ast_plane,
-		   void __iomem *vaddr, u64 offset, unsigned long size,
+		   u64 offset, unsigned long size,
 		   uint32_t possible_crtcs,
 		   const struct drm_plane_funcs *funcs,
 		   const uint32_t *formats, unsigned int format_count,
@@ -466,7 +466,6 @@ int ast_plane_init(struct drm_device *dev, struct ast_plane *ast_plane,
 {
 	struct drm_plane *plane = &ast_plane->base;
 
-	ast_plane->vaddr = vaddr;
 	ast_plane->offset = offset;
 	ast_plane->size = size;
 
@@ -475,6 +474,13 @@ int ast_plane_init(struct drm_device *dev, struct ast_plane *ast_plane,
 					type, NULL);
 }
 
+void __iomem *ast_plane_vaddr(struct ast_plane *ast_plane)
+{
+	struct ast_device *ast = to_ast_device(ast_plane->base.dev);
+
+	return ast->vram + ast_plane->offset;
+}
+
 /*
  * Primary plane
  */
@@ -521,7 +527,7 @@ static void ast_handle_damage(struct ast_plane *ast_plane, struct iosys_map *src
 			      struct drm_framebuffer *fb,
 			      const struct drm_rect *clip)
 {
-	struct iosys_map dst = IOSYS_MAP_INIT_VADDR_IOMEM(ast_plane->vaddr);
+	struct iosys_map dst = IOSYS_MAP_INIT_VADDR_IOMEM(ast_plane_vaddr(ast_plane));
 
 	iosys_map_incr(&dst, drm_fb_clip_offset(fb->pitches[0], fb->format, clip));
 	drm_fb_memcpy(&dst, fb->pitches, src, fb, clip);
@@ -594,12 +600,12 @@ static int ast_primary_plane_helper_get_scanout_buffer(struct drm_plane *plane,
 {
 	struct ast_plane *ast_plane = to_ast_plane(plane);
 
-	if (plane->state && plane->state->fb && ast_plane->vaddr) {
+	if (plane->state && plane->state->fb) {
 		sb->format = plane->state->fb->format;
 		sb->width = plane->state->fb->width;
 		sb->height = plane->state->fb->height;
 		sb->pitch[0] = plane->state->fb->pitches[0];
-		iosys_map_set_vaddr_iomem(&sb->map[0], ast_plane->vaddr);
+		iosys_map_set_vaddr_iomem(&sb->map[0], ast_plane_vaddr(ast_plane));
 		return 0;
 	}
 	return -ENODEV;
@@ -626,12 +632,11 @@ static int ast_primary_plane_init(struct ast_device *ast)
 	struct drm_device *dev = &ast->base;
 	struct ast_plane *ast_primary_plane = &ast->primary_plane;
 	struct drm_plane *primary_plane = &ast_primary_plane->base;
-	void __iomem *vaddr = ast->vram;
 	u64 offset = ast_fb_vram_offset();
 	unsigned long size = ast_fb_vram_size(ast);
 	int ret;
 
-	ret = ast_plane_init(dev, ast_primary_plane, vaddr, offset, size,
+	ret = ast_plane_init(dev, ast_primary_plane, offset, size,
 			     0x01, &ast_primary_plane_funcs,
 			     ast_primary_plane_formats, ARRAY_SIZE(ast_primary_plane_formats),
 			     NULL, DRM_PLANE_TYPE_PRIMARY);