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path: root/drivers/usb/wusbcore/pal.c
blob: 090f27371a8f1cbe78a68911a3703b49b7306d94 (plain)
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/*
 * Wireless USB Host Controller
 * UWB Protocol Adaptation Layer (PAL) glue.
 *
 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "wusbhc.h"

static void wusbhc_channel_changed(struct uwb_pal *pal, int channel)
{
	struct wusbhc *wusbhc = container_of(pal, struct wusbhc, pal);

	dev_dbg(wusbhc->dev, "%s: channel = %d\n", __func__, channel);
	if (channel < 0)
		wusbhc_stop(wusbhc);
	else
		wusbhc_start(wusbhc);
}

/**
 * wusbhc_pal_register - register the WUSB HC as a UWB PAL
 * @wusbhc: the WUSB HC
 */
int wusbhc_pal_register(struct wusbhc *wusbhc)
{
	uwb_pal_init(&wusbhc->pal);

	wusbhc->pal.name   = "wusbhc";
	wusbhc->pal.device = wusbhc->usb_hcd.self.controller;
	wusbhc->pal.rc     = wusbhc->uwb_rc;
	wusbhc->pal.channel_changed = wusbhc_channel_changed;

	return uwb_pal_register(&wusbhc->pal);
}

/**
 * wusbhc_pal_unregister - unregister the WUSB HC as a UWB PAL
 * @wusbhc: the WUSB HC
 */
void wusbhc_pal_unregister(struct wusbhc *wusbhc)
{
	if (wusbhc->uwb_rc)
		uwb_pal_unregister(&wusbhc->pal);
}
ot require ACPI/CPPC to enable HWP, and so it runs in HWP mode, exposing this incorrect BIOS configuration. There are several ways to address this problem. First, Linux can also run in legacy P-state mode on this system. As intel_pstate is how Linux enables HWP, booting with "intel_pstate=disable" will run in acpi-cpufreq/ondemand legacy p-state mode. Or second, the "performance" governor can be used with intel_pstate, which will modify HWP.EPP to 0. Or third, starting in 4.10, the /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference attribute in can be updated from "balance_power" to "performance". Or fourth, apply this patch, which fixes the erroneous setting of MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default configuration to function as designed. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Cc: 4.6+ <stable@vger.kernel.org> # 4.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/power/qos.c')