69 lines
2.6 KiB
Diff
69 lines
2.6 KiB
Diff
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From e7495effeb9ceb9c0abe75e34169f34604328e68 Mon Sep 17 00:00:00 2001
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From: Lukasz Luba <lukasz.luba@arm.com>
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Date: Thu, 21 Jan 2021 17:04:45 +0000
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Subject: [PATCH 098/109] ODROID-BACKPORT: drm/panfrost: Add governor data with
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pre-defined thresholds
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The simple_ondemand devfreq governor uses two thresholds to decide about
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the frequency change: upthreshold, downdifferential. These two tunable
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change the behavior of the governor decision, e.g. how fast to increase
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the frequency or how rapidly limit the frequency. This patch adds needed
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governor data with thresholds values gathered experimentally in different
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workloads.
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Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
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Reviewed-by: Steven Price <steven.price@arm.com>
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Signed-off-by: Steven Price <steven.price@arm.com>
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Link: https://patchwork.freedesktop.org/patch/msgid/20210121170445.19761-1-lukasz.luba@arm.com
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Change-Id: I31515863ab174edf691542cbc6ffbf50959bb095
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---
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drivers/gpu/drm/panfrost/panfrost_devfreq.c | 10 +++++++++-
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drivers/gpu/drm/panfrost/panfrost_devfreq.h | 2 ++
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2 files changed, 11 insertions(+), 1 deletion(-)
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diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
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index 56b3f5935703..7c5ffc81dce1 100644
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--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
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+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
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@@ -130,8 +130,16 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
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panfrost_devfreq_profile.initial_freq = cur_freq;
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dev_pm_opp_put(opp);
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+ /*
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+ * Setup default thresholds for the simple_ondemand governor.
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+ * The values are chosen based on experiments.
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+ */
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+ pfdevfreq->gov_data.upthreshold = 45;
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+ pfdevfreq->gov_data.downdifferential = 5;
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+
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devfreq = devm_devfreq_add_device(dev, &panfrost_devfreq_profile,
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- DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
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+ DEVFREQ_GOV_SIMPLE_ONDEMAND,
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+ &pfdevfreq->gov_data);
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if (IS_ERR(devfreq)) {
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DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
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ret = PTR_ERR(devfreq);
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diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.h b/drivers/gpu/drm/panfrost/panfrost_devfreq.h
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index db6ea48e21f9..1e2a4de941aa 100644
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--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.h
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+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.h
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@@ -4,6 +4,7 @@
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#ifndef __PANFROST_DEVFREQ_H__
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#define __PANFROST_DEVFREQ_H__
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+#include <linux/devfreq.h>
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#include <linux/spinlock.h>
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#include <linux/ktime.h>
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@@ -17,6 +18,7 @@ struct panfrost_devfreq {
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struct devfreq *devfreq;
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struct opp_table *regulators_opp_table;
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struct thermal_cooling_device *cooling;
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+ struct devfreq_simple_ondemand_data gov_data;
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bool opp_of_table_added;
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ktime_t busy_time;
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--
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2.25.1
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