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cpuidle: tegra: Squash Tegra30 driver into the common driver

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Tegra20 and Terga30 SoCs have common C1 and CC6 idling states and thus
share the same code paths, there is no point in having separate drivers
for a similar hardware. This patch merely moves functionality of the old
driver into the new, although the CC6 state is kept disabled for now since
old driver had a rudimentary support for this state (allowing to enter
into CC6 only when secondary CPUs are put offline), while new driver can
provide a full-featured support. The new feature will be enabled by
another patch.

Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Jasper Korten <jja2000@gmail.com>
Tested-by: David Heidelberg <david@ixit.cz>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2020-02-25 01:40:53 +03:00 committed by Thierry Reding
parent 860fbde438
commit 19461a499c
5 changed files with 70 additions and 136 deletions
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3
arch/arm/mach-tegra/Makefile
View file

@ -13,9 +13,6 @@ obj-y += sleep-tegra30.o
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += pm-tegra20.o
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += pm-tegra30.o
ifeq ($(CONFIG_CPU_IDLE),y)
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += cpuidle-tegra30.o
endif
obj-$(CONFIG_SMP) += platsmp.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o

123
arch/arm/mach-tegra/cpuidle-tegra30.c
View file

@ -1,123 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* CPU idle driver for Tegra CPUs
*
* Copyright (c) 2010-2012, NVIDIA Corporation.
* Copyright (c) 2011 Google, Inc.
* Author: Colin Cross <ccross@android.com>
* Gary King <gking@nvidia.com>
*
* Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com>
*/
#include <linux/clk/tegra.h>
#include <linux/tick.h>
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <soc/tegra/pm.h>
#include <asm/cpuidle.h>
#include <asm/smp_plat.h>
#include <asm/suspend.h>
#include "cpuidle.h"
#include "sleep.h"
#ifdef CONFIG_PM_SLEEP
static int tegra30_idle_lp2(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index);
#endif
static struct cpuidle_driver tegra_idle_driver = {
.name = "tegra_idle",
.owner = THIS_MODULE,
#ifdef CONFIG_PM_SLEEP
.state_count = 2,
#else
.state_count = 1,
#endif
.states = {
[0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
#ifdef CONFIG_PM_SLEEP
[1] = {
.enter = tegra30_idle_lp2,
.exit_latency = 2000,
.target_residency = 2200,
.power_usage = 0,
.flags = CPUIDLE_FLAG_TIMER_STOP,
.name = "powered-down",
.desc = "CPU power gated",
},
#endif
},
};
#ifdef CONFIG_PM_SLEEP
static bool tegra30_cpu_cluster_power_down(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
/* All CPUs entering LP2 is not working.
* Don't let CPU0 enter LP2 when any secondary CPU is online.
*/
if (num_online_cpus() > 1 || !tegra_cpu_rail_off_ready()) {
cpu_do_idle();
return false;
}
return !tegra_pm_enter_lp2();
}
#ifdef CONFIG_SMP
static bool tegra30_cpu_core_power_down(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
smp_wmb();
cpu_suspend(0, tegra30_pm_secondary_cpu_suspend);
return true;
}
#else
static inline bool tegra30_cpu_core_power_down(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
return true;
}
#endif
static int tegra30_idle_lp2(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
bool entered_lp2 = false;
local_fiq_disable();
tegra_pm_set_cpu_in_lp2();
cpu_pm_enter();
if (dev->cpu == 0)
entered_lp2 = tegra30_cpu_cluster_power_down(dev, drv, index);
else
entered_lp2 = tegra30_cpu_core_power_down(dev, drv, index);
cpu_pm_exit();
tegra_pm_clear_cpu_in_lp2();
local_fiq_enable();
return (entered_lp2) ? index : 0;
}
#endif
int __init tegra30_cpuidle_init(void)
{
return cpuidle_register(&tegra_idle_driver, NULL);
}

5
arch/arm/mach-tegra/cpuidle.c
View file

@ -24,11 +24,8 @@ void __init tegra_cpuidle_init(void)
{
switch (tegra_get_chip_id()) {
case TEGRA20:
platform_device_register_simple("tegra-cpuidle", -1, NULL, 0);
break;
case TEGRA30:
if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC))
tegra30_cpuidle_init();
platform_device_register_simple("tegra-cpuidle", -1, NULL, 0);
break;
case TEGRA114:
case TEGRA124:

1
arch/arm/mach-tegra/cpuidle.h
View file

@ -7,7 +7,6 @@
#define __MACH_TEGRA_CPUIDLE_H
#ifdef CONFIG_CPU_IDLE
int tegra30_cpuidle_init(void);
int tegra114_cpuidle_init(void);
void tegra_cpuidle_init(void);
#else

74
drivers/cpuidle/cpuidle-tegra.c
View file

@ -37,6 +37,7 @@
enum tegra_state {
TEGRA_C1,
TEGRA_C7,
TEGRA_CC6,
TEGRA_STATE_COUNT,
};
@ -122,6 +123,11 @@ static int tegra_cpuidle_cc6_enter(unsigned int cpu)
return ret;
}
static int tegra_cpuidle_c7_enter(void)
{
return cpu_suspend(0, tegra30_pm_secondary_cpu_suspend);
}
static int tegra_cpuidle_coupled_barrier(struct cpuidle_device *dev)
{
if (tegra_pending_sgi()) {
@ -169,6 +175,10 @@ static int tegra_cpuidle_state_enter(struct cpuidle_device *dev,
cpu_pm_enter();
switch (index) {
case TEGRA_C7:
ret = tegra_cpuidle_c7_enter();
break;
case TEGRA_CC6:
ret = tegra_cpuidle_cc6_enter(cpu);
break;
@ -185,6 +195,24 @@ static int tegra_cpuidle_state_enter(struct cpuidle_device *dev,
return ret;
}
static int tegra_cpuidle_adjust_state_index(int index, unsigned int cpu)
{
/*
* On Tegra30 CPU0 can't be power-gated separately from secondary
* cores because it gates the whole CPU cluster.
*/
if (cpu > 0 || index != TEGRA_C7 || tegra_get_chip_id() != TEGRA30)
return index;
/* put CPU0 into C1 if C7 is requested and secondaries are online */
if (!IS_ENABLED(CONFIG_PM_SLEEP) || num_online_cpus() > 1)
index = TEGRA_C1;
else
index = TEGRA_CC6;
return index;
}
static int tegra_cpuidle_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
@ -192,10 +220,17 @@ static int tegra_cpuidle_enter(struct cpuidle_device *dev,
unsigned int cpu = cpu_logical_map(dev->cpu);
int err;
err = tegra_cpuidle_state_enter(dev, index, cpu);
if (err && err != -EINTR)
pr_err_once("cpu%u failed to enter idle state %d err: %d\n",
cpu, index, err);
index = tegra_cpuidle_adjust_state_index(index, cpu);
if (dev->states_usage[index].disable)
return -1;
if (index == TEGRA_C1)
err = arm_cpuidle_simple_enter(dev, drv, index);
else
err = tegra_cpuidle_state_enter(dev, index, cpu);
if (err && (err != -EINTR || index != TEGRA_CC6))
pr_err_once("failed to enter state %d err: %d\n", index, err);
return err ? -1 : index;
}
@ -221,6 +256,15 @@ static struct cpuidle_driver tegra_idle_driver = {
.name = "tegra_idle",
.states = {
[TEGRA_C1] = ARM_CPUIDLE_WFI_STATE_PWR(600),
[TEGRA_C7] = {
.enter = tegra_cpuidle_enter,
.exit_latency = 2000,
.target_residency = 2200,
.power_usage = 100,
.flags = CPUIDLE_FLAG_TIMER_STOP,
.name = "C7",
.desc = "CPU core powered off",
},
[TEGRA_CC6] = {
.enter = tegra_cpuidle_enter,
.exit_latency = 5000,
@ -265,8 +309,28 @@ static int tegra_cpuidle_probe(struct platform_device *pdev)
* Tegra-arch core and PMC driver, is unavailable if PM-sleep option
* is disabled.
*/
if (!IS_ENABLED(CONFIG_PM_SLEEP))
if (!IS_ENABLED(CONFIG_PM_SLEEP)) {
tegra_cpuidle_disable_state(TEGRA_C7);
tegra_cpuidle_disable_state(TEGRA_CC6);
}
/*
* Generic WFI state (also known as C1 or LP3) and the coupled CPU
* cluster power-off (CC6 or LP2) states are common for all Tegra SoCs.
*/
switch (tegra_get_chip_id()) {
case TEGRA20:
/* Tegra20 isn't capable to power-off individual CPU cores */
tegra_cpuidle_disable_state(TEGRA_C7);
break;
case TEGRA30:
tegra_cpuidle_disable_state(TEGRA_CC6);
break;
default:
return -EINVAL;
}
return cpuidle_register(&tegra_idle_driver, cpu_possible_mask);
}