![Linus Torvalds](/assets/img/avatar_default.png)
- Generic PM domains support update including new PM domain callbacks to handle device initialization better (Russell King, Rafael J Wysocki, Kevin Hilman). - Unified device properties API update including a new mechanism for accessing data provided by platform initialization code (Rafael J Wysocki, Adrian Hunter). - ARM cpuidle update including ARM32/ARM64 handling consolidation (Daniel Lezcano). - intel_idle update including support for the Silvermont Core in the Baytrail SOC and for the Airmont Core in the Cherrytrail and Braswell SOCs (Len Brown, Mathias Krause). - New cpufreq driver for Hisilicon ACPU (Leo Yan). - intel_pstate update including support for the Knights Landing chip (Dasaratharaman Chandramouli, Kristen Carlson Accardi). - QorIQ cpufreq driver update (Tang Yuantian, Arnd Bergmann). - powernv cpufreq driver update (Shilpasri G Bhat). - devfreq update including Tegra support changes (Tomeu Vizoso, MyungJoo Ham, Chanwoo Choi). - powercap RAPL (Running-Average Power Limit) driver update including support for Intel Broadwell server chips (Jacob Pan, Mathias Krause). - ACPI device enumeration update related to the handling of the special PRP0001 device ID allowing DT-style 'compatible' property to be used for ACPI device identification (Rafael J Wysocki). - ACPI EC driver update including limited _DEP support (Lan Tianyu, Lv Zheng). - ACPI backlight driver update including a new mechanism to allow native backlight handling to be forced on non-Windows 8 systems and a new quirk for Lenovo Ideapad Z570 (Aaron Lu, Hans de Goede). - New Windows Vista compatibility quirk for Sony VGN-SR19XN (Chen Yu). - Assorted ACPI fixes and cleanups (Aaron Lu, Martin Kepplinger, Masanari Iida, Mika Westerberg, Nan Li, Rafael J Wysocki). - Fixes related to suspend-to-idle for the iTCO watchdog driver and the ACPI core system suspend/resume code (Rafael J Wysocki, Chen Yu). - PM tracing support for the suspend phase of system suspend/resume transitions (Zhonghui Fu). - Configurable delay for the system suspend/resume testing facility (Brian Norris). - PNP subsystem cleanups (Peter Huewe, Rafael J Wysocki). / -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABCAAGBQJVLbO+AAoJEILEb/54YlRx5N4QAJXsmEW1FL2l6mMAyTQkEsVj nbqjF9I6aJgYM9+i8GKaZJxpN17SAZ7Ii7aCAXjPwX8AvjT70+gcZr+KDWtPir61 B75VNVEcUYOR4vOF5Z6rQcQMlhGPkfMOJYXFMahpOG6DdPbVh1x2/tuawfc6IC0V a6S/fln6WqHrXQ+8swDSv1KuZsav6+8AQaTlNUQkkuXdY9b3k/3xiy5C2K26APP8 x1B39iAF810qX6ipnK0gEOC3Vs29dl7hvNmgOVmmkBGVS7+pqTuy5n1/9M12cDRz 78IQ7DXB0NcSwr5tdrmGVUyH0Q6H9lnD3vO7MJkYwKDh5a/2MiBr2GZc4KHDKDWn E1sS27f1Pdn9qnpWLzTcY+yYNV3EEyre56L2fc+sh+Xq9sNOjUah+Y/eAej/IxYD XYRf+GAj768yCJgNP+Y3PJES/PRh+0IZ/dn5k0Qq2iYvc8mcObyG6zdQIvCucv/i 70uV1Z2GWEb31cI9TUV8o5GrMW3D0KI9EsCEEpiFFUnhjNog3AWcerGgFQMHxu7X ZnNSzudvek+XJ3NtpbPgTiJAmnMz8bDvBQm3G1LUO2TQdjYTU6YMUHsfzXs8DL6c aIMWO4stkVuDtWrlT/hfzIXepliccyXmSP6sbH+zNNCepulXe5C4M2SftaDi4l/B uIctXWznvHoGys+EFL+v =erd3 -----END PGP SIGNATURE----- Merge tag 'pm+acpi-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management and ACPI updates from Rafael Wysocki: "These are mostly fixes and cleanups all over, although there are a few items that sort of fall into the new feature category. First off, we have new callbacks for PM domains that should help us to handle some issues related to device initialization in a better way. There also is some consolidation in the unified device properties API area allowing us to use that inferface for accessing data coming from platform initialization code in addition to firmware-provided data. We have some new device/CPU IDs in a few drivers, support for new chips and a new cpufreq driver too. Specifics: - Generic PM domains support update including new PM domain callbacks to handle device initialization better (Russell King, Rafael J Wysocki, Kevin Hilman) - Unified device properties API update including a new mechanism for accessing data provided by platform initialization code (Rafael J Wysocki, Adrian Hunter) - ARM cpuidle update including ARM32/ARM64 handling consolidation (Daniel Lezcano) - intel_idle update including support for the Silvermont Core in the Baytrail SOC and for the Airmont Core in the Cherrytrail and Braswell SOCs (Len Brown, Mathias Krause) - New cpufreq driver for Hisilicon ACPU (Leo Yan) - intel_pstate update including support for the Knights Landing chip (Dasaratharaman Chandramouli, Kristen Carlson Accardi) - QorIQ cpufreq driver update (Tang Yuantian, Arnd Bergmann) - powernv cpufreq driver update (Shilpasri G Bhat) - devfreq update including Tegra support changes (Tomeu Vizoso, MyungJoo Ham, Chanwoo Choi) - powercap RAPL (Running-Average Power Limit) driver update including support for Intel Broadwell server chips (Jacob Pan, Mathias Krause) - ACPI device enumeration update related to the handling of the special PRP0001 device ID allowing DT-style 'compatible' property to be used for ACPI device identification (Rafael J Wysocki) - ACPI EC driver update including limited _DEP support (Lan Tianyu, Lv Zheng) - ACPI backlight driver update including a new mechanism to allow native backlight handling to be forced on non-Windows 8 systems and a new quirk for Lenovo Ideapad Z570 (Aaron Lu, Hans de Goede) - New Windows Vista compatibility quirk for Sony VGN-SR19XN (Chen Yu) - Assorted ACPI fixes and cleanups (Aaron Lu, Martin Kepplinger, Masanari Iida, Mika Westerberg, Nan Li, Rafael J Wysocki) - Fixes related to suspend-to-idle for the iTCO watchdog driver and the ACPI core system suspend/resume code (Rafael J Wysocki, Chen Yu) - PM tracing support for the suspend phase of system suspend/resume transitions (Zhonghui Fu) - Configurable delay for the system suspend/resume testing facility (Brian Norris) - PNP subsystem cleanups (Peter Huewe, Rafael J Wysocki)" * tag 'pm+acpi-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (74 commits) ACPI / scan: Fix NULL pointer dereference in acpi_companion_match() ACPI / scan: Rework modalias creation when "compatible" is present intel_idle: mark cpu id array as __initconst powercap / RAPL: mark rapl_ids array as __initconst powercap / RAPL: add ID for Broadwell server intel_pstate: Knights Landing support intel_pstate: remove MSR test cpufreq: fix qoriq uniprocessor build ACPI / scan: Take the PRP0001 position in the list of IDs into account ACPI / scan: Simplify acpi_match_device() ACPI / scan: Generalize of_compatible matching device property: Introduce firmware node type for platform data device property: Make it possible to use secondary firmware nodes PM / watchdog: iTCO: stop watchdog during system suspend cpufreq: hisilicon: add acpu driver ACPI / EC: Call acpi_walk_dep_device_list() after installing EC opregion handler cpufreq: powernv: Report cpu frequency throttling intel_idle: Add support for the Airmont Core in the Cherrytrail and Braswell SOCs intel_idle: Update support for Silvermont Core in Baytrail SOC PM / devfreq: tegra: Register governor on module init ...
228 lines
4.8 KiB
C
228 lines
4.8 KiB
C
/*
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* CPU idle driver for Tegra CPUs
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*
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* Copyright (c) 2010-2012, NVIDIA Corporation.
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* Copyright (c) 2011 Google, Inc.
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* Author: Colin Cross <ccross@android.com>
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* Gary King <gking@nvidia.com>
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*
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* Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/clk/tegra.h>
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#include <linux/tick.h>
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#include <linux/cpuidle.h>
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#include <linux/cpu_pm.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/cpuidle.h>
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#include <asm/smp_plat.h>
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#include <asm/suspend.h>
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#include "flowctrl.h"
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#include "iomap.h"
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#include "irq.h"
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#include "pm.h"
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#include "sleep.h"
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#ifdef CONFIG_PM_SLEEP
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static bool abort_flag;
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static atomic_t abort_barrier;
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static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index);
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#define TEGRA20_MAX_STATES 2
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#else
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#define TEGRA20_MAX_STATES 1
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#endif
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static struct cpuidle_driver tegra_idle_driver = {
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.name = "tegra_idle",
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.owner = THIS_MODULE,
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.states = {
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ARM_CPUIDLE_WFI_STATE_PWR(600),
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#ifdef CONFIG_PM_SLEEP
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{
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.enter = tegra20_idle_lp2_coupled,
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.exit_latency = 5000,
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.target_residency = 10000,
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.power_usage = 0,
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.flags = CPUIDLE_FLAG_COUPLED,
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.name = "powered-down",
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.desc = "CPU power gated",
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},
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#endif
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},
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.state_count = TEGRA20_MAX_STATES,
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.safe_state_index = 0,
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};
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#ifdef CONFIG_PM_SLEEP
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#ifdef CONFIG_SMP
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static void __iomem *pmc = IO_ADDRESS(TEGRA_PMC_BASE);
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static int tegra20_reset_sleeping_cpu_1(void)
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{
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int ret = 0;
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tegra_pen_lock();
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if (readl(pmc + PMC_SCRATCH41) == CPU_RESETTABLE)
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tegra20_cpu_shutdown(1);
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else
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ret = -EINVAL;
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tegra_pen_unlock();
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return ret;
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}
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static void tegra20_wake_cpu1_from_reset(void)
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{
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tegra_pen_lock();
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tegra20_cpu_clear_resettable();
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/* enable cpu clock on cpu */
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tegra_enable_cpu_clock(1);
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/* take the CPU out of reset */
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tegra_cpu_out_of_reset(1);
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/* unhalt the cpu */
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flowctrl_write_cpu_halt(1, 0);
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tegra_pen_unlock();
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}
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static int tegra20_reset_cpu_1(void)
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{
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if (!cpu_online(1) || !tegra20_reset_sleeping_cpu_1())
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return 0;
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tegra20_wake_cpu1_from_reset();
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return -EBUSY;
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}
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#else
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static inline void tegra20_wake_cpu1_from_reset(void)
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{
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}
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static inline int tegra20_reset_cpu_1(void)
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{
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return 0;
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}
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#endif
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static bool tegra20_cpu_cluster_power_down(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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while (tegra20_cpu_is_resettable_soon())
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cpu_relax();
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if (tegra20_reset_cpu_1() || !tegra_cpu_rail_off_ready())
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return false;
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tick_broadcast_enter();
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tegra_idle_lp2_last();
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tick_broadcast_exit();
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if (cpu_online(1))
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tegra20_wake_cpu1_from_reset();
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return true;
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}
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#ifdef CONFIG_SMP
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static bool tegra20_idle_enter_lp2_cpu_1(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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tick_broadcast_enter();
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cpu_suspend(0, tegra20_sleep_cpu_secondary_finish);
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tegra20_cpu_clear_resettable();
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tick_broadcast_exit();
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return true;
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}
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#else
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static inline bool tegra20_idle_enter_lp2_cpu_1(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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return true;
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}
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#endif
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static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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bool entered_lp2 = false;
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if (tegra_pending_sgi())
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ACCESS_ONCE(abort_flag) = true;
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cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
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if (abort_flag) {
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cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
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abort_flag = false; /* clean flag for next coming */
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return -EINTR;
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}
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local_fiq_disable();
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tegra_set_cpu_in_lp2();
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cpu_pm_enter();
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if (dev->cpu == 0)
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entered_lp2 = tegra20_cpu_cluster_power_down(dev, drv, index);
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else
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entered_lp2 = tegra20_idle_enter_lp2_cpu_1(dev, drv, index);
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cpu_pm_exit();
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tegra_clear_cpu_in_lp2();
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local_fiq_enable();
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smp_rmb();
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return entered_lp2 ? index : 0;
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}
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#endif
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/*
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* Tegra20 HW appears to have a bug such that PCIe device interrupts, whether
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* they are legacy IRQs or MSI, are lost when LP2 is enabled. To work around
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* this, simply disable LP2 if the PCI driver and DT node are both enabled.
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*/
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void tegra20_cpuidle_pcie_irqs_in_use(void)
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{
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pr_info_once(
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"Disabling cpuidle LP2 state, since PCIe IRQs are in use\n");
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tegra_idle_driver.states[1].disabled = true;
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}
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int __init tegra20_cpuidle_init(void)
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{
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return cpuidle_register(&tegra_idle_driver, cpu_possible_mask);
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}
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