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drm/panfrost: Register devfreq cooling device 

When we have devfreq, also try to register a basic cooling device in
case GPU workloads manage to hit thermal throttling thresholds.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/21f228099321f460d62e0ab7c77b2d2213dd4da8.1574974319.git.robin.murphy@arm.com
This commit is contained in:
Robin Murphy 2019-11-28 20:54:27 +00:00 committed by Rob Herring
parent 1ca3fd96f9
commit bc1152b086
1 changed files with 21 additions and 11 deletions
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32
drivers/gpu/drm/panfrost/panfrost_devfreq.c
View File

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Collabora ltd. */
#include <linux/devfreq.h>
#include <linux/devfreq_cooling.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/clk.h>
@ -81,8 +82,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
int ret;
struct dev_pm_opp *opp;
unsigned long cur_freq;
struct device *dev = &pfdev->pdev->dev;
struct devfreq *devfreq;
struct thermal_cooling_device *cooling;
ret = dev_pm_opp_of_add_table(&pfdev->pdev->dev);
ret = dev_pm_opp_of_add_table(dev);
if (ret == -ENODEV) /* Optional, continue without devfreq */
return 0;
else if (ret)
@ -92,29 +96,35 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
cur_freq = clk_get_rate(pfdev->clock);
opp = devfreq_recommended_opp(&pfdev->pdev->dev, &cur_freq, 0);
opp = devfreq_recommended_opp(dev, &cur_freq, 0);
if (IS_ERR(opp))
return PTR_ERR(opp);
panfrost_devfreq_profile.initial_freq = cur_freq;
dev_pm_opp_put(opp);
pfdev->devfreq.devfreq = devm_devfreq_add_device(&pfdev->pdev->dev,
&panfrost_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
NULL);
if (IS_ERR(pfdev->devfreq.devfreq)) {
DRM_DEV_ERROR(&pfdev->pdev->dev, "Couldn't initialize GPU devfreq\n");
ret = PTR_ERR(pfdev->devfreq.devfreq);
pfdev->devfreq.devfreq = NULL;
dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
return ret;
devfreq = devm_devfreq_add_device(dev, &panfrost_devfreq_profile,
DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
if (IS_ERR(devfreq)) {
DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
dev_pm_opp_of_remove_table(dev);
return PTR_ERR(devfreq);
}
pfdev->devfreq.devfreq = devfreq;
cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
if (IS_ERR(cooling))
DRM_DEV_INFO(dev, "Failed to register cooling device\n");
else
pfdev->devfreq.cooling = cooling;
return 0;
}
void panfrost_devfreq_fini(struct panfrost_device *pfdev)
{
if (pfdev->devfreq.cooling)
devfreq_cooling_unregister(pfdev->devfreq.cooling);
dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
}