drm/plane-helper: Export individual helpers

Export the individual plane helpers that make up the plane functions and
align the naming with other helpers. The plane helpers are for non-atomic
modesetting and exporting them will simplify a later conversion of drivers
to atomic modesetting.

With struct drm_plane_funcs removed from drm_plane_helper.h, also remove
the include statements. It only needs linux/types.h for uint32_t and a
number of forward declarations.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220720083058.15371-6-tzimmermann@suse.de

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -85,6 +85,7 @@
 #include <drm/drm_vblank.h>
 #include <drm/drm_audio_component.h>
 #include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
 
 #include "ivsrcid/dcn/irqsrcs_dcn_1_0.h"
 
@@ -7717,7 +7718,7 @@ static void dm_drm_plane_destroy_state(struct drm_plane *plane,
 static const struct drm_plane_funcs dm_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
-	.destroy	= drm_primary_helper_destroy,
+	.destroy	= drm_plane_helper_destroy,
 	.reset = dm_drm_plane_reset,
 	.atomic_duplicate_state = dm_drm_plane_duplicate_state,
 	.atomic_destroy_state = dm_drm_plane_destroy_state,

drivers/gpu/drm/armada/armada_plane.c

@@ -288,7 +288,7 @@ struct drm_plane_state *armada_plane_duplicate_state(struct drm_plane *plane)
 static const struct drm_plane_funcs armada_primary_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
-	.destroy	= drm_primary_helper_destroy,
+	.destroy	= drm_plane_helper_destroy,
 	.reset		= armada_plane_reset,
 	.atomic_duplicate_state = armada_plane_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,

drivers/gpu/drm/drm_modeset_helper.c

@@ -108,6 +108,12 @@ static const uint32_t safe_modeset_formats[] = {
 	DRM_FORMAT_ARGB8888,
 };
 
+static const struct drm_plane_funcs primary_plane_funcs = {
+	.update_plane = drm_plane_helper_update_primary,
+	.disable_plane = drm_plane_helper_disable_primary,
+	.destroy = drm_plane_helper_destroy,
+};
+
 static struct drm_plane *create_primary_plane(struct drm_device *dev)
 {
 	struct drm_plane *primary;
@@ -127,7 +133,7 @@ static struct drm_plane *create_primary_plane(struct drm_device *dev)
 
 	/* possible_crtc's will be filled in later by crtc_init */
 	ret = drm_universal_plane_init(dev, primary, 0,
-				       &drm_primary_helper_funcs,
+				       &primary_plane_funcs,
 				       safe_modeset_formats,
 				       ARRAY_SIZE(safe_modeset_formats),
 				       NULL,

drivers/gpu/drm/drm_plane_helper.c

@@ -145,7 +145,30 @@ static int drm_plane_helper_check_update(struct drm_plane *plane,
 	return 0;
 }
 
-static int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
+/**
+ * drm_plane_helper_update_primary - Helper for updating primary planes
+ * @plane: plane to update
+ * @crtc: the plane's new CRTC
+ * @fb: the plane's new framebuffer
+ * @crtc_x: x coordinate within CRTC
+ * @crtc_y: y coordinate within CRTC
+ * @crtc_w: width coordinate within CRTC
+ * @crtc_h: height coordinate within CRTC
+ * @src_x: x coordinate within source
+ * @src_y: y coordinate within source
+ * @src_w: width coordinate within source
+ * @src_h: height coordinate within source
+ * @ctx: modeset locking context
+ *
+ * This helper validates the given parameters and updates the primary plane.
+ *
+ * This function is only useful for non-atomic modesetting. Don't use
+ * it in new drivers.
+ *
+ * Returns:
+ * Zero on success, or an errno code otherwise.
+ */
+int drm_plane_helper_update_primary(struct drm_plane *plane, struct drm_crtc *crtc,
 				    struct drm_framebuffer *fb,
 				    int crtc_x, int crtc_y,
 				    unsigned int crtc_w, unsigned int crtc_h,
@@ -218,31 +241,40 @@ static int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *c
 	kfree(connector_list);
 	return ret;
 }
+EXPORT_SYMBOL(drm_plane_helper_update_primary);
 
-static int drm_primary_helper_disable(struct drm_plane *plane,
+/**
+ * drm_plane_helper_disable_primary - Helper for disabling primary planes
+ * @plane: plane to disable
+ * @ctx: modeset locking context
+ *
+ * This helper returns an error when trying to disable the primary
+ * plane.
+ *
+ * This function is only useful for non-atomic modesetting. Don't use
+ * it in new drivers.
+ *
+ * Returns:
+ * An errno code.
+ */
+int drm_plane_helper_disable_primary(struct drm_plane *plane,
 				     struct drm_modeset_acquire_ctx *ctx)
 {
 	return -EINVAL;
 }
+EXPORT_SYMBOL(drm_plane_helper_disable_primary);
 
 /**
- * drm_primary_helper_destroy() - Helper for primary plane destruction
+ * drm_plane_helper_destroy() - Helper for primary plane destruction
  * @plane: plane to destroy
  *
  * Provides a default plane destroy handler for primary planes.  This handler
  * is called during CRTC destruction.  We disable the primary plane, remove
  * it from the DRM plane list, and deallocate the plane structure.
  */
-void drm_primary_helper_destroy(struct drm_plane *plane)
+void drm_plane_helper_destroy(struct drm_plane *plane)
 {
 	drm_plane_cleanup(plane);
 	kfree(plane);
 }
-EXPORT_SYMBOL(drm_primary_helper_destroy);
-
-const struct drm_plane_funcs drm_primary_helper_funcs = {
-	.update_plane = drm_primary_helper_update,
-	.disable_plane = drm_primary_helper_disable,
-	.destroy = drm_primary_helper_destroy,
-};
-EXPORT_SYMBOL(drm_primary_helper_funcs);
+EXPORT_SYMBOL(drm_plane_helper_destroy);

drivers/gpu/drm/nouveau/dispnv04/crtc.c

@@ -1275,6 +1275,12 @@ static const uint32_t modeset_formats[] = {
         DRM_FORMAT_XRGB1555,
 };
 
+static const struct drm_plane_funcs nv04_primary_plane_funcs = {
+	.update_plane = drm_plane_helper_update_primary,
+	.disable_plane = drm_plane_helper_disable_primary,
+	.destroy = drm_plane_helper_destroy,
+};
+
 static struct drm_plane *
 create_primary_plane(struct drm_device *dev)
 {
@@ -1289,7 +1295,7 @@ create_primary_plane(struct drm_device *dev)
 
         /* possible_crtc's will be filled in later by crtc_init */
         ret = drm_universal_plane_init(dev, primary, 0,
-                                       &drm_primary_helper_funcs,
+				       &nv04_primary_plane_funcs,
                                        modeset_formats,
                                        ARRAY_SIZE(modeset_formats), NULL,
                                        DRM_PLANE_TYPE_PRIMARY, NULL);

drivers/gpu/drm/qxl/qxl_display.c

@@ -902,7 +902,7 @@ static const struct drm_plane_helper_funcs qxl_cursor_helper_funcs = {
 static const struct drm_plane_funcs qxl_cursor_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
-	.destroy	= drm_primary_helper_destroy,
+	.destroy	= drm_plane_helper_destroy,
 	.reset		= drm_atomic_helper_plane_reset,
 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
@@ -924,7 +924,7 @@ static const struct drm_plane_helper_funcs primary_helper_funcs = {
 static const struct drm_plane_funcs qxl_primary_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
-	.destroy	= drm_primary_helper_destroy,
+	.destroy	= drm_plane_helper_destroy,
 	.reset		= drm_atomic_helper_plane_reset,
 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,

drivers/gpu/drm/vboxvideo/vbox_mode.c

@@ -477,7 +477,7 @@ static const struct drm_plane_helper_funcs vbox_cursor_helper_funcs = {
 static const struct drm_plane_funcs vbox_cursor_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
-	.destroy	= drm_primary_helper_destroy,
+	.destroy	= drm_plane_helper_destroy,
 	DRM_GEM_SHADOW_PLANE_FUNCS,
 };
 
@@ -496,7 +496,7 @@ static const struct drm_plane_helper_funcs vbox_primary_helper_funcs = {
 static const struct drm_plane_funcs vbox_primary_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
-	.destroy	= drm_primary_helper_destroy,
+	.destroy	= drm_plane_helper_destroy,
 	.reset		= drm_atomic_helper_plane_reset,
 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,

include/drm/drm_plane_helper.h

@@ -24,12 +24,22 @@
 #ifndef DRM_PLANE_HELPER_H
 #define DRM_PLANE_HELPER_H
 
-#include <drm/drm_rect.h>
-#include <drm/drm_crtc.h>
-#include <drm/drm_modeset_helper_vtables.h>
-#include <drm/drm_modeset_helper.h>
+#include <linux/types.h>
 
-void drm_primary_helper_destroy(struct drm_plane *plane);
-extern const struct drm_plane_funcs drm_primary_helper_funcs;
+struct drm_crtc;
+struct drm_framebuffer;
+struct drm_modeset_acquire_ctx;
+struct drm_plane;
+
+int drm_plane_helper_update_primary(struct drm_plane *plane, struct drm_crtc *crtc,
+				    struct drm_framebuffer *fb,
+				    int crtc_x, int crtc_y,
+				    unsigned int crtc_w, unsigned int crtc_h,
+				    uint32_t src_x, uint32_t src_y,
+				    uint32_t src_w, uint32_t src_h,
+				    struct drm_modeset_acquire_ctx *ctx);
+int drm_plane_helper_disable_primary(struct drm_plane *plane,
+				     struct drm_modeset_acquire_ctx *ctx);
+void drm_plane_helper_destroy(struct drm_plane *plane);
 
 #endif