linux-kernel - [PATCH v2 3/3] drm/msm/gpu: Add default devfreq thresholds

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Message-Id: <20230110231447.1939101-4-robdclark@gmail.com>
Date:   Tue, 10 Jan 2023 15:14:44 -0800
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 3/3] drm/msm/gpu: Add default devfreq thresholds

From: Rob Clark <robdclark@...omium.org>

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gpu_devfreq.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index e578d74d402f..1f31e72ca0cf 100644
--- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
+++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
@@ -145,6 +145,15 @@ void msm_devfreq_init(struct msm_gpu *gpu)
 	if (!gpu->funcs->gpu_busy)
 		return;
 
+	/*
+	 * Setup default values for simple_ondemand governor tuning.  We
+	 * want to throttle up at 50% load for the double-buffer case,
+	 * where due to stalling waiting for vblank we could get stuck
+	 * at (for ex) 30fps at 50% utilization.
+	 */
+	priv->gpu_devfreq_config.upthreshold = 50;
+	priv->gpu_devfreq_config.downdifferential = 10;
+
 	mutex_init(&df->lock);
 
 	dev_pm_qos_add_request(&gpu->pdev->dev, &df->boost_freq,
-- 
2.38.1