[PATCH 17/17] drm/msm/adreno: Relax devfreq tunings

Akhil P Oommen akhilpo at oss.qualcomm.com
Sun Jul 20 12:16:18 UTC 2025


Relax the devfreq tunings when IFPC feature is supported because there
is no wakeup latency that we have to hide with aggressive dcvs. This
helps to eliminate the very frequent gpu frequency spikes to FMAX even
with common lightweight workloads like UI scrolling. Some profiling
data from X1E which shows the improvement:

DUT: X1E CRD, 1.25Ghz GPU FMAX, 2880x1800 at 120Hz, Debian Trixie Gnome
Testcase: WebGL aquarium with Chromium

Current dcvs config:

  +--------+--------------+------------+------+
  | Fishes | GPU Load (%) | Freq (Mhz) | FPS  |
  +--------+--------------+------------+------+
  | 1      | 23           | 300        | 120  |
  | 100    | 29           | 300        | 120  |
  | 500    | 41           | 300        | 120  |
  | 1000   | 45           | 390/550    | 120  |
  | 5000   | 50           | 1250       | 120  |
  | 10000  | 93           | 1250       | 120  |
  | 15000  | 100          | 1250       | 87   |
  +--------+--------------+------------+------+

New dcvs config:

  +--------+--------------+------------+------+
  | Fishes | GPU Load (%) | Freq (Mhz) | FPS  |
  +--------+--------------+------------+------+
  | 1      | 23           | 300        | 120  |
  | 100    | 28           | 300        | 120  |
  | 500    | 42           | 300        | 120  |
  | 1000   | 62           | 300        | 120  |
  | 5000   | 84           | 744        | 120  |
  | 10000  | 93           | 1250       | 120  |
  | 15000  | 100          | 1250       | 87   |
  +--------+--------------+------------+------+

Signed-off-by: Akhil P Oommen <akhilpo at oss.qualcomm.com>
---
 drivers/gpu/drm/msm/msm_gpu_devfreq.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index 53ef2add5047e7d6b6371af949cab36ce8409372..212963a5b8b57597bf5b01ab90893b01fd9c6e76 100644
--- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
+++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
@@ -156,6 +156,13 @@ void msm_devfreq_init(struct msm_gpu *gpu)
 	priv->gpu_devfreq_config.upthreshold = 50;
 	priv->gpu_devfreq_config.downdifferential = 10;
 
+	/*
+	 * Relax the tunings when IFPC is supported because there is negligible latency in
+	 * switching power state
+	 */
+	if (to_adreno_gpu(gpu)->info->quirks & ADRENO_QUIRK_IFPC)
+		priv->gpu_devfreq_config.upthreshold = 90;
+
 	mutex_init(&df->lock);
 	df->suspended = true;
 

-- 
2.50.1



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