drm/msm: stop storing the array of CRTCs in struct msm_drm_private

The array of CRTC in the struct msm_drm_private duplicates a list of
CRTCs in the drm_device. Drop it and use the existing list for CRTC
enumeration.

Signed-off-by: Dmitry Baryshkov <[e-mail]>
Reviewed-by: Abhinav Kumar <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/538068/
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

···
 			ret = PTR_ERR(crtc);
 			return ret;
 		}
-		priv->crtcs[priv->num_crtcs++] = crtc;
+		priv->num_crtcs++;
 	}
 
 	/* All CRTCs are compatible with all encoders */

drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c

···
 			goto fail;
 		}
 
-		priv->crtcs[priv->num_crtcs++] = crtc;
+		priv->num_crtcs++;
 	}
 
 	/*

drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c

···
 			DRM_DEV_ERROR(dev->dev, "failed to construct crtc %d (%d)\n", i, ret);
 			goto fail;
 		}
-		priv->crtcs[priv->num_crtcs++] = crtc;
+		priv->num_crtcs++;
 	}
 
 	/*

drivers/gpu/drm/msm/msm_drv.c

···
 
 struct msm_vblank_work {
 	struct work_struct work;
-	int crtc_id;
+	struct drm_crtc *crtc;
 	bool enable;
 	struct msm_drm_private *priv;
 };
···
 	struct msm_kms *kms = priv->kms;
 
 	if (vbl_work->enable)
-		kms->funcs->enable_vblank(kms, priv->crtcs[vbl_work->crtc_id]);
+		kms->funcs->enable_vblank(kms, vbl_work->crtc);
 	else
-		kms->funcs->disable_vblank(kms,	priv->crtcs[vbl_work->crtc_id]);
+		kms->funcs->disable_vblank(kms,	vbl_work->crtc);
 
 	kfree(vbl_work);
 }
 
 static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
-					int crtc_id, bool enable)
+					struct drm_crtc *crtc, bool enable)
 {
 	struct msm_vblank_work *vbl_work;
 
···
 
 	INIT_WORK(&vbl_work->work, vblank_ctrl_worker);
 
-	vbl_work->crtc_id = crtc_id;
+	vbl_work->crtc = crtc;
 	vbl_work->enable = enable;
 	vbl_work->priv = priv;
 
···
 	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct drm_device *ddev;
 	struct msm_kms *kms;
-	int ret, i;
+	struct drm_crtc *crtc;
+	int ret;
 
 	if (drm_firmware_drivers_only())
 		return -ENODEV;
···
 	ddev->mode_config.funcs = &mode_config_funcs;
 	ddev->mode_config.helper_private = &mode_config_helper_funcs;
 
-	for (i = 0; i < priv->num_crtcs; i++) {
+	drm_for_each_crtc(crtc, ddev) {
+		struct msm_drm_thread *ev_thread;
+
 		/* initialize event thread */
-		priv->event_thread[i].crtc_id = priv->crtcs[i]->base.id;
-		priv->event_thread[i].dev = ddev;
-		priv->event_thread[i].worker = kthread_create_worker(0,
-			"crtc_event:%d", priv->event_thread[i].crtc_id);
-		if (IS_ERR(priv->event_thread[i].worker)) {
-			ret = PTR_ERR(priv->event_thread[i].worker);
+		ev_thread = &priv->event_thread[drm_crtc_index(crtc)];
+		ev_thread->dev = ddev;
+		ev_thread->worker = kthread_create_worker(0, "crtc_event:%d", crtc->base.id);
+		if (IS_ERR(ev_thread->worker)) {
+			ret = PTR_ERR(ev_thread->worker);
 			DRM_DEV_ERROR(dev, "failed to create crtc_event kthread\n");
-			priv->event_thread[i].worker = NULL;
+			ev_thread->worker = NULL;
 			goto err_msm_uninit;
 		}
 
-		sched_set_fifo(priv->event_thread[i].worker->task);
+		sched_set_fifo(ev_thread->worker->task);
 	}
 
 	ret = drm_vblank_init(ddev, priv->num_crtcs);
···
 int msm_crtc_enable_vblank(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
-	unsigned int pipe = crtc->index;
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 	if (!kms)
 		return -ENXIO;
-	drm_dbg_vbl(dev, "crtc=%u", pipe);
-	return vblank_ctrl_queue_work(priv, pipe, true);
+	drm_dbg_vbl(dev, "crtc=%u", crtc->base.id);
+	return vblank_ctrl_queue_work(priv, crtc, true);
 }
 
 void msm_crtc_disable_vblank(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
-	unsigned int pipe = crtc->index;
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 	if (!kms)
 		return;
-	drm_dbg_vbl(dev, "crtc=%u", pipe);
-	vblank_ctrl_queue_work(priv, pipe, false);
+	drm_dbg_vbl(dev, "crtc=%u", crtc->base.id);
+	vblank_ctrl_queue_work(priv, crtc, false);
 }
 
 /*

drivers/gpu/drm/msm/msm_drv.h

···
 /* Commit/Event thread specific structure */
 struct msm_drm_thread {
 	struct drm_device *dev;
-	unsigned int crtc_id;
 	struct kthread_worker *worker;
 };
 
···
 	struct workqueue_struct *wq;
 
 	unsigned int num_crtcs;
-	struct drm_crtc *crtcs[MAX_CRTCS];
 
 	struct msm_drm_thread event_thread[MAX_CRTCS];