path: root/drivers/gpu/drm/nouveau/nouveau_pm.c

/*
 * Copyright 2010 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#ifdef CONFIG_ACPI
#include <linux/acpi.h>
#endif
#include <linux/power_supply.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>

#include <drm/drmP.h>

#include "nouveau_drm.h"
#include "nouveau_pm.h"

#include <subdev/gpio.h>
#include <subdev/timer.h>
#include <subdev/therm.h>

MODULE_PARM_DESC(perflvl, "Performance level (default: boot)");
static char *nouveau_perflvl;
module_param_named(perflvl, nouveau_perflvl, charp, 0400);

MODULE_PARM_DESC(perflvl_wr, "Allow perflvl changes (warning: dangerous!)");
static int nouveau_perflvl_wr;
module_param_named(perflvl_wr, nouveau_perflvl_wr, int, 0400);

static int
nouveau_pm_perflvl_aux(struct drm_device *dev, struct nouveau_pm_level *perflvl,
		       struct nouveau_pm_level *a, struct nouveau_pm_level *b)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nouveau_pm *pm = nouveau_pm(dev);
	struct nouveau_therm *therm = nouveau_therm(drm);
	int ret;

	/*XXX: not on all boards, we should control based on temperature
	 *     on recent boards..  or maybe on some other factor we don't
	 *     know about?
	 */
	if (therm && therm->fan_set &&
		a->fanspeed && b->fanspeed && b->fanspeed > a->fanspeed) {
		ret = therm->fan_set(therm, perflvl->fanspeed);
		if (ret && ret != -ENODEV) {
			NV_ERROR(drm, "fanspeed set failed: %d\n", ret);
			return ret;
		}
	}

	if (pm->voltage.supported && pm->voltage_set) {
		if (perflvl->volt_min && b->volt_min > a->volt_min) {
			ret = pm->voltage_set(dev, perflvl->volt_min);
			if (ret) {
				NV_ERROR(drm, "voltage set failed: %d\n", ret);
				return ret;
			}
		}
	}

	return 0;
}

static int
nouveau_pm_perflvl_set(struct drm_device *dev, struct nouveau_pm_level *perflvl)
{
	struct nouveau_pm *pm = nouveau_pm(dev);
	void *state;
	int ret;

	if (perflvl == pm->cur)
		return 0;

	ret = nouveau_pm_perflvl_aux(dev, perflvl, pm->cur, perflvl);
	if (ret)
		return ret;

	state = pm->clocks_pre(dev, perflvl);
	if (IS_ERR(state)) {
		ret = PTR_ERR(state);
		goto error;
	}
	ret = pm->clocks_set(dev, state);
	if (ret)
		goto error;

	ret = nouveau_pm_perflvl_aux(dev, perflvl, perflvl, pm->cur);
	if (ret)
		return ret;

	pm->cur = perflvl;
	return 0;

error:
	/* restore the fan speed and voltage before leaving */
	nouveau_pm_perflvl_aux(dev, perflvl, perflvl, pm->cur);
	return ret;
}

void
nouveau_pm_trigger(struct drm_device *dev)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nouveau_timer *ptimer = nouveau_timer(drm->device);
	struct nouveau_pm *pm = nouveau_pm(dev);
	struct nouveau_pm_profile *profile = NULL;
	struct nouveau_pm_level *perflvl = NULL;
	int ret;

	/* select power profile based on current power source */
	if (power_supply_is_system_supplied())
		profile = pm->profile_ac;
	else
		profile = pm->profile_dc;

	if (profile != pm->profile) {
		pm->profile->func->fini(pm->profile);
		pm->profile = profile;
		pm->profile->func->init(pm->profile);
	}

	/* select performance level based on profile */
	perflvl = profile->func->select(profile);

	/* change perflvl, if necessary */
	if (perflvl != pm->cur) {
		u64 time0 = ptimer->read(ptimer);

		NV_INFO(drm, "setting performance level: %d", perflvl->id);
		ret = nouveau_pm_perflvl_set(dev, perflvl);
		if (ret)
			NV_INFO(drm, "> reclocking failed: %d\n\n", ret);

		NV_INFO