Merge "drm/msm: move display and event threads to realtime priority" (457e6997) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/gpu/drm/msm/msm_drv.c

+24 −0

Original line number	Diff line number	Diff line
		@@ -521,6 +521,7 @@ static int msm_drm_init(struct device dev, struct drm_driver drv)
		struct msm_kms *kms;
		struct sde_dbg_power_ctrl dbg_power_ctrl = { 0 };
		int ret, i;
		struct sched_param param;

		ddev = drm_dev_alloc(drv, dev);
		if (!ddev) {
		@@ -624,6 +625,12 @@ static int msm_drm_init(struct device dev, struct drm_driver drv)
		}
		ddev->mode_config.funcs = &mode_config_funcs;

		/**
		* this priority was found during empiric testing to have appropriate
		* realtime scheduling to process display updates and interact with
		* other real time and normal priority task
		*/
		param.sched_priority = 16;
		for (i = 0; i < priv->num_crtcs; i++) {

		/* initialize display thread */
		@@ -634,6 +641,11 @@ static int msm_drm_init(struct device dev, struct drm_driver drv)
		kthread_run(kthread_worker_fn,
		&priv->disp_thread[i].worker,
		"crtc_commit:%d", priv->disp_thread[i].crtc_id);
		ret = sched_setscheduler(priv->disp_thread[i].thread,
		SCHED_FIFO, &param);
		if (ret)
		pr_warn("display thread priority update failed: %d\n",
		ret);

		if (IS_ERR(priv->disp_thread[i].thread)) {
		dev_err(dev, "failed to create crtc_commit kthread\n");
		@@ -648,6 +660,18 @@ static int msm_drm_init(struct device dev, struct drm_driver drv)
		kthread_run(kthread_worker_fn,
		&priv->event_thread[i].worker,
		"crtc_event:%d", priv->event_thread[i].crtc_id);
		/**
		* event thread should also run at same priority as disp_thread
		* because it is handling frame_done events. A lower priority
		* event thread and higher priority disp_thread can causes
		* frame_pending counters beyond 2. This can lead to commit
		* failure at crtc commit level.
		*/
		ret = sched_setscheduler(priv->event_thread[i].thread,
		SCHED_FIFO, &param);
		if (ret)
		pr_warn("display event thread priority update failed: %d\n",
		ret);

		if (IS_ERR(priv->event_thread[i].thread)) {
		dev_err(dev, "failed to create crtc_event kthread\n");