drm: renesas: shmobile: Remove internal CRTC state tracking

Now the suspend/resume methods no longer need to look at internal driver
state, the dpms and started fields in the shmob_drm_crtc structure can
be removed, as well as the shmob_drm_crtc_dpms() wrapper.  After this,
shmob_drm_crtc_atomic_{en,dis}able() became just wrappers around
shmob_drm_crtc_st{art,op}(), so inline the latter.
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/905b9ca72f43d40438c8cb1199cde140eb123204.1694767209.git.geert+renesas@glider.be

drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c

@@ -191,25 +191,21 @@ static void shmob_drm_crtc_start_stop(struct shmob_drm_crtc *scrtc, bool start)
 	}
 }
 
-/*
- * shmob_drm_crtc_start - Configure and start the LCDC
- * @scrtc: the SH Mobile CRTC
- *
- * Configure and start the LCDC device. External devices (clocks, MERAM, panels,
- * ...) are not touched by this function.
- */
-static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc)
+static inline struct shmob_drm_crtc *to_shmob_crtc(struct drm_crtc *crtc)
 {
-	struct drm_crtc *crtc = &scrtc->base;
+	return container_of(crtc, struct shmob_drm_crtc, base);
+}
+
+static void shmob_drm_crtc_atomic_enable(struct drm_crtc *crtc,
+					 struct drm_atomic_state *state)
+{
+	struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
 	struct shmob_drm_device *sdev = to_shmob_device(crtc->dev);
 	const struct shmob_drm_interface_data *idata = &sdev->pdata->iface;
 	struct device *dev = sdev->dev;
 	u32 value;
 	int ret;
 
-	if (scrtc->started)
-		return;
-
 	ret = pm_runtime_resume_and_get(dev);
 	if (ret)
 		return;
@@ -256,18 +252,14 @@ static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc)
 
 	/* Turn vertical blank interrupt reporting back on. */
 	drm_crtc_vblank_on(crtc);
-
-	scrtc->started = true;
 }
 
-static void shmob_drm_crtc_stop(struct shmob_drm_crtc *scrtc)
+static void shmob_drm_crtc_atomic_disable(struct drm_crtc *crtc,
+					  struct drm_atomic_state *state)
 {
-	struct drm_crtc *crtc = &scrtc->base;
+	struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
 	struct shmob_drm_device *sdev = to_shmob_device(crtc->dev);
 
-	if (!scrtc->started)
-		return;
-
 	/*
 	 * Disable vertical blank interrupt reporting.  We first need to wait
 	 * for page flip completion before stopping the CRTC as userspace
@@ -283,28 +275,6 @@ static void shmob_drm_crtc_stop(struct shmob_drm_crtc *scrtc)
 	lcdc_write(sdev, LDCNT1R, 0);
 
 	pm_runtime_put(sdev->dev);
-
-	scrtc->started = false;
-}
-
-static inline struct shmob_drm_crtc *to_shmob_crtc(struct drm_crtc *crtc)
-{
-	return container_of(crtc, struct shmob_drm_crtc, base);
-}
-
-static void shmob_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
-{
-	struct shmob_drm_crtc *scrtc = to_shmob_crtc(crtc);
-
-	if (scrtc->dpms == mode)
-		return;
-
-	if (mode == DRM_MODE_DPMS_ON)
-		shmob_drm_crtc_start(scrtc);
-	else
-		shmob_drm_crtc_stop(scrtc);
-
-	scrtc->dpms = mode;
 }
 
 static void shmob_drm_crtc_atomic_flush(struct drm_crtc *crtc,
@@ -323,18 +293,6 @@ static void shmob_drm_crtc_atomic_flush(struct drm_crtc *crtc,
 	}
 }
 
-static void shmob_drm_crtc_atomic_enable(struct drm_crtc *crtc,
-					 struct drm_atomic_state *state)
-{
-	shmob_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
-}
-
-static void shmob_drm_crtc_atomic_disable(struct drm_crtc *crtc,
-					  struct drm_atomic_state *state)
-{
-	shmob_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
-}
-
 static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
 	.atomic_flush = shmob_drm_crtc_atomic_flush,
 	.atomic_enable = shmob_drm_crtc_atomic_enable,
@@ -424,8 +382,6 @@ int shmob_drm_crtc_create(struct shmob_drm_device *sdev)
 
 	init_waitqueue_head(&sdev->crtc.flip_wait);
 
-	sdev->crtc.dpms = DRM_MODE_DPMS_OFF;
-
 	primary = shmob_drm_plane_create(sdev, DRM_PLANE_TYPE_PRIMARY, 0);
 	if (IS_ERR(primary))
 		return PTR_ERR(primary);

drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.h

@@ -27,9 +27,6 @@ struct shmob_drm_crtc {
 
 	struct drm_pending_vblank_event *event;
 	wait_queue_head_t flip_wait;
-	int dpms;
-
-	bool started;
 };
 
 struct shmob_drm_connector {