drm/atomic-helper: Add NO_DISABLE_AFTER_MODESET flag support for plane commit

Drivers may set the NO_DISABLE_AFTER_MODESET flag in the 'flags' parameter
of the helper drm_atomic_helper_commit_planes() if the relevant display
controllers(e.g., IPUv3 for imx-drm) require to disable a CRTC's planes
when the CRTC is disabled. The helper would skip the ->atomic_disable
call for a plane if the CRTC of the old plane state needs a modesetting
operation. Of course, the drivers need to disable the planes in their CRTC
disable callbacks since no one else would do that.

Suggested-by: Daniel Vetter <[e-mail]>
Cc: Philipp Zabel <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Russell King <[e-mail]>
Cc: Peter Senna Tschudin <[e-mail]>
Cc: Lucas Stach <[e-mail]>
Signed-off-by: Liu Ying <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/arm/malidp_drv.c

···
 
 	drm_atomic_helper_commit_modeset_disables(drm, state);
 	drm_atomic_helper_commit_modeset_enables(drm, state);
-	drm_atomic_helper_commit_planes(drm, state, true);
+	drm_atomic_helper_commit_planes(drm, state,
+					DRM_PLANE_COMMIT_ACTIVE_ONLY);
 
 	malidp_atomic_commit_hw_done(state);
 

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c

···
 
 	/* Apply the atomic update. */
 	drm_atomic_helper_commit_modeset_disables(dev, old_state);
-	drm_atomic_helper_commit_planes(dev, old_state, false);
+	drm_atomic_helper_commit_planes(dev, old_state, 0);
 	drm_atomic_helper_commit_modeset_enables(dev, old_state);
 
 	drm_atomic_helper_wait_for_vblanks(dev, old_state);

drivers/gpu/drm/drm_atomic_helper.c

···
  *
  *     drm_atomic_helper_commit_modeset_enables(dev, state);
  *
- *     drm_atomic_helper_commit_planes(dev, state, true);
+ *     drm_atomic_helper_commit_planes(dev, state,
+ *                                     DRM_PLANE_COMMIT_ACTIVE_ONLY);
  *
  * for committing the atomic update to hardware.  See the kerneldoc entries for
  * these three functions for more details.
···
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
-	drm_atomic_helper_commit_planes(dev, state, false);
+	drm_atomic_helper_commit_planes(dev, state, 0);
 
 	drm_atomic_helper_commit_modeset_enables(dev, state);
 
···
  * drm_atomic_helper_commit_planes - commit plane state
  * @dev: DRM device
  * @old_state: atomic state object with old state structures
- * @active_only: Only commit on active CRTC if set
+ * @flags: flags for committing plane state
  *
  * This function commits the new plane state using the plane and atomic helper
  * functions for planes and crtcs. It assumes that the atomic state has already
···
  * most drivers don't need to be immediately notified of plane updates for a
  * disabled CRTC.
  *
- * Unless otherwise needed, drivers are advised to set the @active_only
- * parameters to true in order not to receive plane update notifications related
- * to a disabled CRTC. This avoids the need to manually ignore plane updates in
+ * Unless otherwise needed, drivers are advised to set the ACTIVE_ONLY flag in
+ * @flags in order not to receive plane update notifications related to a
+ * disabled CRTC. This avoids the need to manually ignore plane updates in
  * driver code when the driver and/or hardware can't or just don't need to deal
  * with updates on disabled CRTCs, for example when supporting runtime PM.
  *
- * The drm_atomic_helper_commit() default implementation only sets @active_only
- * to false to most closely match the behaviour of the legacy helpers. This should
- * not be copied blindly by drivers.
+ * Drivers may set the NO_DISABLE_AFTER_MODESET flag in @flags if the relevant
+ * display controllers require to disable a CRTC's planes when the CRTC is
+ * disabled. This function would skip the ->atomic_disable call for a plane if
+ * the CRTC of the old plane state needs a modesetting operation. Of course,
+ * the drivers need to disable the planes in their CRTC disable callbacks
+ * since no one else would do that.
+ *
+ * The drm_atomic_helper_commit() default implementation doesn't set the
+ * ACTIVE_ONLY flag to most closely match the behaviour of the legacy helpers.
+ * This should not be copied blindly by drivers.
  */
 void drm_atomic_helper_commit_planes(struct drm_device *dev,
 				     struct drm_atomic_state *old_state,
-				     bool active_only)
+				     uint32_t flags)
 {
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *old_crtc_state;
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state;
 	int i;
+	bool active_only = flags & DRM_PLANE_COMMIT_ACTIVE_ONLY;
+	bool no_disable = flags & DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET;
 
 	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
 		const struct drm_crtc_helper_funcs *funcs;
···
 		/*
 		 * Special-case disabling the plane if drivers support it.
 		 */
-		if (disabling && funcs->atomic_disable)
+		if (disabling && funcs->atomic_disable) {
+			struct drm_crtc_state *crtc_state;
+
+			crtc_state = old_plane_state->crtc->state;
+
+			if (drm_atomic_crtc_needs_modeset(crtc_state) &&
+			    no_disable)
+				continue;
+
 			funcs->atomic_disable(plane, old_plane_state);
-		else if (plane->state->crtc || disabling)
+		} else if (plane->state->crtc || disabling) {
 			funcs->atomic_update(plane, old_plane_state);
+		}
 	}
 
 	for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {

drivers/gpu/drm/exynos/exynos_drm_drv.c

···
 		atomic_inc(&exynos_crtc->pending_update);
 	}
 
-	drm_atomic_helper_commit_planes(dev, state, false);
+	drm_atomic_helper_commit_planes(dev, state, 0);
 
 	exynos_atomic_wait_for_commit(state);
 

drivers/gpu/drm/imx/imx-drm-core.c

···
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
-	drm_atomic_helper_commit_planes(dev, state, true);
+	drm_atomic_helper_commit_planes(dev, state,
+					DRM_PLANE_COMMIT_ACTIVE_ONLY);
 
 	drm_atomic_helper_commit_modeset_enables(dev, state);
 

drivers/gpu/drm/mediatek/mtk_drm_drv.c

···
 	 *
 	 *     drm_atomic_helper_commit_modeset_disables(dev, state);
 	 *     drm_atomic_helper_commit_modeset_enables(dev, state);
-	 *     drm_atomic_helper_commit_planes(dev, state, true);
+	 *     drm_atomic_helper_commit_planes(dev, state,
+	 *                                     DRM_PLANE_COMMIT_ACTIVE_ONLY);
 	 *
 	 * See the kerneldoc entries for these three functions for more details.
 	 */
 	drm_atomic_helper_commit_modeset_disables(drm, state);
 	drm_atomic_helper_commit_modeset_enables(drm, state);
-	drm_atomic_helper_commit_planes(drm, state, true);
+	drm_atomic_helper_commit_planes(drm, state,
+					DRM_PLANE_COMMIT_ACTIVE_ONLY);
 
 	drm_atomic_helper_wait_for_vblanks(drm, state);
 

drivers/gpu/drm/msm/msm_atomic.c

···
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
-	drm_atomic_helper_commit_planes(dev, state, false);
+	drm_atomic_helper_commit_planes(dev, state, 0);
 
 	drm_atomic_helper_commit_modeset_enables(dev, state);
 

drivers/gpu/drm/omapdrm/omap_drv.c

···
 	dispc_runtime_get();
 
 	drm_atomic_helper_commit_modeset_disables(dev, old_state);
-	drm_atomic_helper_commit_planes(dev, old_state, false);
+	drm_atomic_helper_commit_planes(dev, old_state, 0);
 	drm_atomic_helper_commit_modeset_enables(dev, old_state);
 
 	omap_atomic_wait_for_completion(dev, old_state);

drivers/gpu/drm/rcar-du/rcar_du_kms.c

···
 	/* Apply the atomic update. */
 	drm_atomic_helper_commit_modeset_disables(dev, old_state);
 	drm_atomic_helper_commit_modeset_enables(dev, old_state);
-	drm_atomic_helper_commit_planes(dev, old_state, true);
+	drm_atomic_helper_commit_planes(dev, old_state,
+					DRM_PLANE_COMMIT_ACTIVE_ONLY);
 
 	drm_atomic_helper_wait_for_vblanks(dev, old_state);
 

drivers/gpu/drm/rockchip/rockchip_drm_fb.c

···
 
 	drm_atomic_helper_commit_modeset_enables(dev, state);
 
-	drm_atomic_helper_commit_planes(dev, state, true);
+	drm_atomic_helper_commit_planes(dev, state,
+					DRM_PLANE_COMMIT_ACTIVE_ONLY);
 
 	drm_atomic_helper_commit_hw_done(state);
 

drivers/gpu/drm/sti/sti_drv.c

···
 	 */
 
 	drm_atomic_helper_commit_modeset_disables(drm, state);
-	drm_atomic_helper_commit_planes(drm, state, false);
+	drm_atomic_helper_commit_planes(drm, state, 0);
 	drm_atomic_helper_commit_modeset_enables(drm, state);
 
 	drm_atomic_helper_wait_for_vblanks(drm, state);

drivers/gpu/drm/tegra/drm.c

···
 
 	drm_atomic_helper_commit_modeset_disables(drm, state);
 	drm_atomic_helper_commit_modeset_enables(drm, state);
-	drm_atomic_helper_commit_planes(drm, state, true);
+	drm_atomic_helper_commit_planes(drm, state,
+					DRM_PLANE_COMMIT_ACTIVE_ONLY);
 
 	drm_atomic_helper_wait_for_vblanks(drm, state);
 

drivers/gpu/drm/tilcdc/tilcdc_drv.c

···
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
-	drm_atomic_helper_commit_planes(dev, state, false);
+	drm_atomic_helper_commit_planes(dev, state, 0);
 
 	drm_atomic_helper_commit_modeset_enables(dev, state);
 

drivers/gpu/drm/vc4/vc4_kms.c

···
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 
-	drm_atomic_helper_commit_planes(dev, state, false);
+	drm_atomic_helper_commit_planes(dev, state, 0);
 
 	drm_atomic_helper_commit_modeset_enables(dev, state);
 

drivers/gpu/drm/virtio/virtgpu_display.c

···
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);
 	drm_atomic_helper_commit_modeset_enables(dev, state);
-	drm_atomic_helper_commit_planes(dev, state, true);
+	drm_atomic_helper_commit_planes(dev, state,
+					DRM_PLANE_COMMIT_ACTIVE_ONLY);
 
 	drm_atomic_helper_commit_hw_done(state);
 

include/drm/drm_atomic_helper.h

···
 
 int drm_atomic_helper_prepare_planes(struct drm_device *dev,
 				     struct drm_atomic_state *state);
+
+#define DRM_PLANE_COMMIT_ACTIVE_ONLY			BIT(0)
+#define DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET	BIT(1)
+
 void drm_atomic_helper_commit_planes(struct drm_device *dev,
 				     struct drm_atomic_state *state,
-				     bool active_only);
+				     uint32_t flags);
 void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
 				      struct drm_atomic_state *old_state);
 void drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state);