drm/msm/gpu: Add default devfreq thresholds

Setup more appropriate devfreq tuning thresholds.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/517788/
Link: https://lore.kernel.org/r/20230110231447.1939101-4-robdclark@gmail.com
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>

diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index ae5380e2abf768c63c1bbd9e90f2fdf336ab6046..e27dbf12b5e8cbddf137468146324b17e277c7eb 100644 (file)
--- 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,