| Message ID | 20190711031312.10038-4-digetx@gmail.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | Consolidate and improve NVIDIA Tegra CPUIDLE driver(s) | expand |
11.07.2019 6:13, Dmitry Osipenko пишет: > The new driver is based on the old CPU Idle drivers that are removed now > from arm/arch/mach-tegra/ directory. Those removed drivers were reworked > and squashed into a single unified driver that covers multiple hardware > generations, starting from Tegra20 and ending with Tegra124. > > Signed-off-by: Dmitry Osipenko <digetx@gmail.com> > --- > arch/arm/mach-tegra/tegra.c | 4 + > drivers/cpuidle/Kconfig.arm | 8 + > drivers/cpuidle/Makefile | 1 + > drivers/cpuidle/cpuidle-tegra.c | 304 ++++++++++++++++++++++++++++++++ > include/soc/tegra/cpuidle.h | 4 + > 5 files changed, 321 insertions(+) > create mode 100644 drivers/cpuidle/cpuidle-tegra.c > > diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c > index d9237769a37c..f1ce2857a251 100644 > --- a/arch/arm/mach-tegra/tegra.c > +++ b/arch/arm/mach-tegra/tegra.c > @@ -36,6 +36,7 @@ > #include <asm/mach/arch.h> > #include <asm/mach/time.h> > #include <asm/mach-types.h> > +#include <asm/psci.h> > #include <asm/setup.h> > > #include "board.h" > @@ -92,6 +93,9 @@ static void __init tegra_dt_init_late(void) > if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && > of_machine_is_compatible("nvidia,tegra20")) > platform_device_register_simple("tegra20-cpufreq", -1, NULL, 0); > + > + if (IS_ENABLED(CONFIG_ARM_TEGRA_CPUIDLE) && !psci_smp_available()) > + platform_device_register_simple("tegra-cpuidle", -1, NULL, 0); > } > > static const char * const tegra_dt_board_compat[] = { > diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm > index 48cb3d4bb7d1..d90861361f1d 100644 > --- a/drivers/cpuidle/Kconfig.arm > +++ b/drivers/cpuidle/Kconfig.arm > @@ -76,3 +76,11 @@ config ARM_MVEBU_V7_CPUIDLE > depends on ARCH_MVEBU && !ARM64 > help > Select this to enable cpuidle on Armada 370, 38x and XP processors. > + > +config ARM_TEGRA_CPUIDLE > + bool "CPU Idle Driver for NVIDIA Tegra SoCs" > + depends on ARCH_TEGRA && !ARM64 > + select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP > + select ARM_CPU_SUSPEND > + help > + Select this to enable cpuidle for NVIDIA Tegra20/30/114/124 SoCs. > diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile > index 9d7176cee3d3..470d17fa8746 100644 > --- a/drivers/cpuidle/Makefile > +++ b/drivers/cpuidle/Makefile > @@ -20,6 +20,7 @@ obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o > obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o > obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o > obj-$(CONFIG_ARM_CPUIDLE) += cpuidle-arm.o > +obj-$(CONFIG_ARM_TEGRA_CPUIDLE) += cpuidle-tegra.o > > ############################################################################### > # MIPS drivers > diff --git a/drivers/cpuidle/cpuidle-tegra.c b/drivers/cpuidle/cpuidle-tegra.c > new file mode 100644 > index 000000000000..54974cd2255f > --- /dev/null > +++ b/drivers/cpuidle/cpuidle-tegra.c > @@ -0,0 +1,304 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * CPU idle driver for Tegra CPUs > + * > + * Copyright (c) 2010-2013, 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> > + * > + * Tegra20/124 driver unification by Dmitry Osipenko <digetx@gmail.com> > + */ > + > +#include <linux/cpuidle.h> > +#include <linux/cpumask.h> > +#include <linux/cpu_pm.h> > +#include <linux/errno.h> > +#include <linux/ktime.h> > +#include <linux/platform_device.h> > +#include <linux/types.h> > + > +#include <linux/clk/tegra.h> > +#include <linux/firmware/trusted_foundations.h> > + > +#include <soc/tegra/cpuidle.h> > +#include <soc/tegra/flowctrl.h> > +#include <soc/tegra/fuse.h> > +#include <soc/tegra/pm.h> > + > +#include <asm/cpuidle.h> > +#include <asm/firmware.h> > +#include <asm/smp_plat.h> > +#include <asm/suspend.h> > + > +#define TEGRA_C1 0 > +#define TEGRA_C7 1 > +#define TEGRA_CC6 2 > + > +static atomic_t tegra_idle_barrier; > + > +static inline bool tegra_cpuidle_using_firmware(void) > +{ > + return firmware_ops->prepare_idle && firmware_ops->do_idle; > +} > + > +static int tegra_shutdown_secondary_cpu(unsigned long cpu) > +{ > + tegra_cpu_die(cpu); > + > + return -EINVAL; > +} > + > +static int tegra_await_secondary_cpus_shutdown(void) > +{ > + ktime_t timeout = ktime_add_ms(ktime_get(), 1); > + > + /* > + * The boot CPU shall await for the secondaries shutdown in order > + * to power-off CPU's cluster safely. > + */ > + do { > + if (tegra_cpu_rail_off_ready()) > + return 0; > + > + } while (ktime_compare(ktime_get(), timeout) < 0); > + > + return -ETIMEDOUT; > +} > + > +static void tegra_wake_up_secondary_cpus(void) > +{ > + unsigned int cpu, lcpu; > + > + for_each_cpu(lcpu, cpu_online_mask) { > + cpu = cpu_logical_map(lcpu); > + > + if (cpu > 0) { > + tegra_enable_cpu_clock(cpu); > + tegra_cpu_out_of_reset(cpu); > + flowctrl_write_cpu_halt(cpu, 0); > + } > + } > +} > + > +static int tegra_cpuidle_cc6_enter(void) > +{ > + int err; > + > + err = tegra_await_secondary_cpus_shutdown(); > + if (err) > + return err; > + > + err = tegra_idle_lp2_last(); > + > + tegra_wake_up_secondary_cpus(); > + > + return err; > +} > + > +static int tegra_cpuidle_c7_enter(void) > +{ > + int err; > + > + if (tegra_cpuidle_using_firmware()) { > + err = call_firmware_op(prepare_idle, TF_PM_MODE_LP2_NOFLUSH_L2); > + if (err) > + return err; > + > + return call_firmware_op(do_idle, 0); > + } > + > + return cpu_suspend(0, tegra30_sleep_cpu_secondary_finish); > +} > + > +static int tegra_cpuidle_enter(struct cpuidle_device *dev, > + int index, unsigned int cpu) > +{ > + int err; > + > + local_fiq_disable(); > + tegra_set_cpu_in_lp2(); > + cpu_pm_enter(); > + > + switch (index) { > + case TEGRA_C7: > + err = tegra_cpuidle_c7_enter(); > + break; > + case TEGRA_CC6: > + cpuidle_coupled_parallel_barrier(dev, &tegra_idle_barrier); I realized that this is not very correct. We still need to do a proper barrier with SGI checking in order to bail out if other CPU sent IPI during of the awaiting for a coupled barrier to avoid the overhead of unnecessary power-gating. Will correct that in the next revision.
11.07.2019 21:35, Dmitry Osipenko пишет: > 11.07.2019 6:13, Dmitry Osipenko пишет: >> The new driver is based on the old CPU Idle drivers that are removed now >> from arm/arch/mach-tegra/ directory. Those removed drivers were reworked >> and squashed into a single unified driver that covers multiple hardware >> generations, starting from Tegra20 and ending with Tegra124. >> >> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> >> --- >> arch/arm/mach-tegra/tegra.c | 4 + >> drivers/cpuidle/Kconfig.arm | 8 + >> drivers/cpuidle/Makefile | 1 + >> drivers/cpuidle/cpuidle-tegra.c | 304 ++++++++++++++++++++++++++++++++ >> include/soc/tegra/cpuidle.h | 4 + >> 5 files changed, 321 insertions(+) >> create mode 100644 drivers/cpuidle/cpuidle-tegra.c >> >> diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c >> index d9237769a37c..f1ce2857a251 100644 >> --- a/arch/arm/mach-tegra/tegra.c >> +++ b/arch/arm/mach-tegra/tegra.c >> @@ -36,6 +36,7 @@ >> #include <asm/mach/arch.h> >> #include <asm/mach/time.h> >> #include <asm/mach-types.h> >> +#include <asm/psci.h> >> #include <asm/setup.h> >> >> #include "board.h" >> @@ -92,6 +93,9 @@ static void __init tegra_dt_init_late(void) >> if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && >> of_machine_is_compatible("nvidia,tegra20")) >> platform_device_register_simple("tegra20-cpufreq", -1, NULL, 0); >> + >> + if (IS_ENABLED(CONFIG_ARM_TEGRA_CPUIDLE) && !psci_smp_available()) >> + platform_device_register_simple("tegra-cpuidle", -1, NULL, 0); >> } >> >> static const char * const tegra_dt_board_compat[] = { >> diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm >> index 48cb3d4bb7d1..d90861361f1d 100644 >> --- a/drivers/cpuidle/Kconfig.arm >> +++ b/drivers/cpuidle/Kconfig.arm >> @@ -76,3 +76,11 @@ config ARM_MVEBU_V7_CPUIDLE >> depends on ARCH_MVEBU && !ARM64 >> help >> Select this to enable cpuidle on Armada 370, 38x and XP processors. >> + >> +config ARM_TEGRA_CPUIDLE >> + bool "CPU Idle Driver for NVIDIA Tegra SoCs" >> + depends on ARCH_TEGRA && !ARM64 >> + select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP >> + select ARM_CPU_SUSPEND >> + help >> + Select this to enable cpuidle for NVIDIA Tegra20/30/114/124 SoCs. >> diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile >> index 9d7176cee3d3..470d17fa8746 100644 >> --- a/drivers/cpuidle/Makefile >> +++ b/drivers/cpuidle/Makefile >> @@ -20,6 +20,7 @@ obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o >> obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o >> obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o >> obj-$(CONFIG_ARM_CPUIDLE) += cpuidle-arm.o >> +obj-$(CONFIG_ARM_TEGRA_CPUIDLE) += cpuidle-tegra.o >> >> ############################################################################### >> # MIPS drivers >> diff --git a/drivers/cpuidle/cpuidle-tegra.c b/drivers/cpuidle/cpuidle-tegra.c >> new file mode 100644 >> index 000000000000..54974cd2255f >> --- /dev/null >> +++ b/drivers/cpuidle/cpuidle-tegra.c >> @@ -0,0 +1,304 @@ >> +// SPDX-License-Identifier: GPL-2.0-only >> +/* >> + * CPU idle driver for Tegra CPUs >> + * >> + * Copyright (c) 2010-2013, 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> >> + * >> + * Tegra20/124 driver unification by Dmitry Osipenko <digetx@gmail.com> >> + */ >> + >> +#include <linux/cpuidle.h> >> +#include <linux/cpumask.h> >> +#include <linux/cpu_pm.h> >> +#include <linux/errno.h> >> +#include <linux/ktime.h> >> +#include <linux/platform_device.h> >> +#include <linux/types.h> >> + >> +#include <linux/clk/tegra.h> >> +#include <linux/firmware/trusted_foundations.h> >> + >> +#include <soc/tegra/cpuidle.h> >> +#include <soc/tegra/flowctrl.h> >> +#include <soc/tegra/fuse.h> >> +#include <soc/tegra/pm.h> >> + >> +#include <asm/cpuidle.h> >> +#include <asm/firmware.h> >> +#include <asm/smp_plat.h> >> +#include <asm/suspend.h> >> + >> +#define TEGRA_C1 0 >> +#define TEGRA_C7 1 >> +#define TEGRA_CC6 2 >> + >> +static atomic_t tegra_idle_barrier; >> + >> +static inline bool tegra_cpuidle_using_firmware(void) >> +{ >> + return firmware_ops->prepare_idle && firmware_ops->do_idle; >> +} >> + >> +static int tegra_shutdown_secondary_cpu(unsigned long cpu) >> +{ >> + tegra_cpu_die(cpu); >> + >> + return -EINVAL; >> +} >> + >> +static int tegra_await_secondary_cpus_shutdown(void) >> +{ >> + ktime_t timeout = ktime_add_ms(ktime_get(), 1); >> + >> + /* >> + * The boot CPU shall await for the secondaries shutdown in order >> + * to power-off CPU's cluster safely. >> + */ >> + do { >> + if (tegra_cpu_rail_off_ready()) >> + return 0; >> + >> + } while (ktime_compare(ktime_get(), timeout) < 0); >> + >> + return -ETIMEDOUT; >> +} >> + >> +static void tegra_wake_up_secondary_cpus(void) >> +{ >> + unsigned int cpu, lcpu; >> + >> + for_each_cpu(lcpu, cpu_online_mask) { >> + cpu = cpu_logical_map(lcpu); >> + >> + if (cpu > 0) { >> + tegra_enable_cpu_clock(cpu); >> + tegra_cpu_out_of_reset(cpu); >> + flowctrl_write_cpu_halt(cpu, 0); >> + } >> + } >> +} >> + >> +static int tegra_cpuidle_cc6_enter(void) >> +{ >> + int err; >> + >> + err = tegra_await_secondary_cpus_shutdown(); >> + if (err) >> + return err; >> + >> + err = tegra_idle_lp2_last(); >> + >> + tegra_wake_up_secondary_cpus(); >> + >> + return err; >> +} >> + >> +static int tegra_cpuidle_c7_enter(void) >> +{ >> + int err; >> + >> + if (tegra_cpuidle_using_firmware()) { >> + err = call_firmware_op(prepare_idle, TF_PM_MODE_LP2_NOFLUSH_L2); >> + if (err) >> + return err; >> + >> + return call_firmware_op(do_idle, 0); >> + } >> + >> + return cpu_suspend(0, tegra30_sleep_cpu_secondary_finish); >> +} >> + >> +static int tegra_cpuidle_enter(struct cpuidle_device *dev, >> + int index, unsigned int cpu) >> +{ >> + int err; >> + >> + local_fiq_disable(); >> + tegra_set_cpu_in_lp2(); >> + cpu_pm_enter(); >> + >> + switch (index) { >> + case TEGRA_C7: >> + err = tegra_cpuidle_c7_enter(); >> + break; >> + case TEGRA_CC6: >> + cpuidle_coupled_parallel_barrier(dev, &tegra_idle_barrier); > > I realized that this is not very correct. We still need to do a proper > barrier with SGI checking in order to bail out if other CPU sent IPI > during of the awaiting for a coupled barrier to avoid the overhead of > unnecessary power-gating. Will correct that in the next revision. UPDATE: Actually, turned out it's even a necessity to handle the SGI because GIC's driver doesn't save and replay SGI across CPU cluster PM.
diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c index d9237769a37c..f1ce2857a251 100644 --- a/arch/arm/mach-tegra/tegra.c +++ b/arch/arm/mach-tegra/tegra.c @@ -36,6 +36,7 @@ #include <asm/mach/arch.h> #include <asm/mach/time.h> #include <asm/mach-types.h> +#include <asm/psci.h> #include <asm/setup.h> #include "board.h" @@ -92,6 +93,9 @@ static void __init tegra_dt_init_late(void) if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && of_machine_is_compatible("nvidia,tegra20")) platform_device_register_simple("tegra20-cpufreq", -1, NULL, 0); + + if (IS_ENABLED(CONFIG_ARM_TEGRA_CPUIDLE) && !psci_smp_available()) + platform_device_register_simple("tegra-cpuidle", -1, NULL, 0); } static const char * const tegra_dt_board_compat[] = { diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm index 48cb3d4bb7d1..d90861361f1d 100644 --- a/drivers/cpuidle/Kconfig.arm +++ b/drivers/cpuidle/Kconfig.arm @@ -76,3 +76,11 @@ config ARM_MVEBU_V7_CPUIDLE depends on ARCH_MVEBU && !ARM64 help Select this to enable cpuidle on Armada 370, 38x and XP processors. + +config ARM_TEGRA_CPUIDLE + bool "CPU Idle Driver for NVIDIA Tegra SoCs" + depends on ARCH_TEGRA && !ARM64 + select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP + select ARM_CPU_SUSPEND + help + Select this to enable cpuidle for NVIDIA Tegra20/30/114/124 SoCs. diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile index 9d7176cee3d3..470d17fa8746 100644 --- a/drivers/cpuidle/Makefile +++ b/drivers/cpuidle/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o obj-$(CONFIG_ARM_CPUIDLE) += cpuidle-arm.o +obj-$(CONFIG_ARM_TEGRA_CPUIDLE) += cpuidle-tegra.o ############################################################################### # MIPS drivers diff --git a/drivers/cpuidle/cpuidle-tegra.c b/drivers/cpuidle/cpuidle-tegra.c new file mode 100644 index 000000000000..54974cd2255f --- /dev/null +++ b/drivers/cpuidle/cpuidle-tegra.c @@ -0,0 +1,304 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * CPU idle driver for Tegra CPUs + * + * Copyright (c) 2010-2013, 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> + * + * Tegra20/124 driver unification by Dmitry Osipenko <digetx@gmail.com> + */ + +#include <linux/cpuidle.h> +#include <linux/cpumask.h> +#include <linux/cpu_pm.h> +#include <linux/errno.h> +#include <linux/ktime.h> +#include <linux/platform_device.h> +#include <linux/types.h> + +#include <linux/clk/tegra.h> +#include <linux/firmware/trusted_foundations.h> + +#include <soc/tegra/cpuidle.h> +#include <soc/tegra/flowctrl.h> +#include <soc/tegra/fuse.h> +#include <soc/tegra/pm.h> + +#include <asm/cpuidle.h> +#include <asm/firmware.h> +#include <asm/smp_plat.h> +#include <asm/suspend.h> + +#define TEGRA_C1 0 +#define TEGRA_C7 1 +#define TEGRA_CC6 2 + +static atomic_t tegra_idle_barrier; + +static inline bool tegra_cpuidle_using_firmware(void) +{ + return firmware_ops->prepare_idle && firmware_ops->do_idle; +} + +static int tegra_shutdown_secondary_cpu(unsigned long cpu) +{ + tegra_cpu_die(cpu); + + return -EINVAL; +} + +static int tegra_await_secondary_cpus_shutdown(void) +{ + ktime_t timeout = ktime_add_ms(ktime_get(), 1); + + /* + * The boot CPU shall await for the secondaries shutdown in order + * to power-off CPU's cluster safely. + */ + do { + if (tegra_cpu_rail_off_ready()) + return 0; + + } while (ktime_compare(ktime_get(), timeout) < 0); + + return -ETIMEDOUT; +} + +static void tegra_wake_up_secondary_cpus(void) +{ + unsigned int cpu, lcpu; + + for_each_cpu(lcpu, cpu_online_mask) { + cpu = cpu_logical_map(lcpu); + + if (cpu > 0) { + tegra_enable_cpu_clock(cpu); + tegra_cpu_out_of_reset(cpu); + flowctrl_write_cpu_halt(cpu, 0); + } + } +} + +static int tegra_cpuidle_cc6_enter(void) +{ + int err; + + err = tegra_await_secondary_cpus_shutdown(); + if (err) + return err; + + err = tegra_idle_lp2_last(); + + tegra_wake_up_secondary_cpus(); + + return err; +} + +static int tegra_cpuidle_c7_enter(void) +{ + int err; + + if (tegra_cpuidle_using_firmware()) { + err = call_firmware_op(prepare_idle, TF_PM_MODE_LP2_NOFLUSH_L2); + if (err) + return err; + + return call_firmware_op(do_idle, 0); + } + + return cpu_suspend(0, tegra30_sleep_cpu_secondary_finish); +} + +static int tegra_cpuidle_enter(struct cpuidle_device *dev, + int index, unsigned int cpu) +{ + int err; + + local_fiq_disable(); + tegra_set_cpu_in_lp2(); + cpu_pm_enter(); + + switch (index) { + case TEGRA_C7: + err = tegra_cpuidle_c7_enter(); + break; + case TEGRA_CC6: + cpuidle_coupled_parallel_barrier(dev, &tegra_idle_barrier); + + if (cpu > 0) + err = cpu_suspend(cpu, tegra_shutdown_secondary_cpu); + else + err = tegra_cpuidle_cc6_enter(); + break; + default: + err = -EINVAL; + break; + } + + cpu_pm_exit(); + tegra_clear_cpu_in_lp2(); + local_fiq_enable(); + + smp_rmb(); + + return err; +} + +static int tegra_adjust_state_index(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index, unsigned int cpu) +{ + /* + * On Tegra30 CPU0 can't be power-gated while secondary CPUs + * are active because it gates the whole CPU cluster. + */ + if (cpu != 0 || index != TEGRA_C7 || tegra_get_chip_id() != TEGRA30) + return index; + + if (!IS_ENABLED(CONFIG_PM_SLEEP) || num_online_cpus() > 1) + index = TEGRA_C1; + else + index = TEGRA_CC6; + + if (drv->states[index].disabled || dev->states_usage[index].disable) + index = -1; + + return index; +} + +static int tegra_cpu_idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index) +{ + unsigned int cpu = cpu_logical_map(dev->cpu); + int err; + + index = tegra_adjust_state_index(dev, drv, index, cpu); + if (index < 0) + return index; + + if (index == TEGRA_C1) + err = arm_cpuidle_simple_enter(dev, drv, index); + else + err = tegra_cpuidle_enter(dev, index, cpu); + + return WARN_ON_ONCE(err) ? -1 : index; +} + +static void tegra114_enter_s2idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index) +{ + tegra_cpu_idle(dev, drv, index); +} + +static struct cpuidle_driver tegra_idle_driver = { + .name = "tegra_idle", + .states = { + [TEGRA_C1] = ARM_CPUIDLE_WFI_STATE_PWR(600), + [TEGRA_C7] = { + .enter = tegra_cpu_idle, + .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_cpu_idle, + .exit_latency = 5000, + .target_residency = 10000, + .power_usage = 0, + .flags = CPUIDLE_FLAG_TIMER_STOP | + CPUIDLE_FLAG_COUPLED, + .name = "CC6", + .desc = "CPU cluster powered off", + }, + }, + .state_count = 3, + .safe_state_index = TEGRA_C1, +}; + +/* + * Tegra20 HW appears to have a bug such that PCIe device interrupts, whether + * they are legacy IRQs or MSI, are lost when LP2 is enabled. To work around + * this, simply disable LP2 if the PCI driver and DT node are both enabled. + */ +void tegra_cpuidle_pcie_irqs_in_use(void) +{ + if (tegra_get_chip_id() != TEGRA20 || + tegra_idle_driver.states[TEGRA_CC6].disabled) + return; + + pr_info("Disabling cpuidle LP2 state, since PCIe IRQs are in use\n"); + tegra_idle_driver.states[TEGRA_CC6].disabled = true; +} + +static void tegra_cpuidle_adjust_tegra114_c7_state(void) +{ + struct cpuidle_state *s = &tegra_idle_driver.states[TEGRA_C7]; + + s->enter_s2idle = tegra114_enter_s2idle; + s->target_residency = 1000; + s->exit_latency = 500; +} + +static int tegra_cpuidle_probe(struct platform_device *pdev) +{ + /* + * Tegra30+ SoCs are big.LITTLE architectures, but the Little + * core is not supported at the moment. + */ + const struct cpumask *coupled_cpus = cpu_possible_mask; + + /* + * Required suspend-resume functionality, which is provided by the + * Tegra-arch core and PMC driver, is unavailable if PM-sleep option + * is disabled. + */ + if (!IS_ENABLED(CONFIG_PM_SLEEP)) { + if (!tegra_cpuidle_using_firmware()) + tegra_idle_driver.states[TEGRA_C7].disabled = true; + + tegra_idle_driver.states[TEGRA_CC6].disabled = true; + } + + /* + * Generic WFI state (also known as C1 or LP3) is common for all + * NVIDIA Tegra SoCs. + */ + switch (tegra_get_chip_id()) { + case TEGRA20: + /* CPU cores can't be power-gated separately at all */ + tegra_idle_driver.states[TEGRA_C7].disabled = true; + break; + case TEGRA30: + tegra_idle_driver.states[TEGRA_CC6].disabled = true; + break; + case TEGRA114: + case TEGRA124: + tegra_cpuidle_adjust_tegra114_c7_state(); + + /* coupled CC6 (LP2) state isn't implemented yet */ + tegra_idle_driver.states[TEGRA_CC6].disabled = true; + break; + default: + return -EINVAL; + } + + return cpuidle_register(&tegra_idle_driver, coupled_cpus); +} + +static struct platform_driver tegra_cpuidle_driver = { + .probe = tegra_cpuidle_probe, + .driver = { + .name = "tegra-cpuidle", + .suppress_bind_attrs = true, + }, +}; +builtin_platform_driver(tegra_cpuidle_driver); diff --git a/include/soc/tegra/cpuidle.h b/include/soc/tegra/cpuidle.h index f758808342b6..5665975015d8 100644 --- a/include/soc/tegra/cpuidle.h +++ b/include/soc/tegra/cpuidle.h @@ -6,8 +6,12 @@ #ifndef __SOC_TEGRA_CPUIDLE_H__ #define __SOC_TEGRA_CPUIDLE_H__ +#ifdef CONFIG_ARM_TEGRA_CPUIDLE +void tegra_cpuidle_pcie_irqs_in_use(void); +#else static inline void tegra_cpuidle_pcie_irqs_in_use(void) { } +#endif #endif /* __SOC_TEGRA_CPUIDLE_H__ */
The new driver is based on the old CPU Idle drivers that are removed now from arm/arch/mach-tegra/ directory. Those removed drivers were reworked and squashed into a single unified driver that covers multiple hardware generations, starting from Tegra20 and ending with Tegra124. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- arch/arm/mach-tegra/tegra.c | 4 + drivers/cpuidle/Kconfig.arm | 8 + drivers/cpuidle/Makefile | 1 + drivers/cpuidle/cpuidle-tegra.c | 304 ++++++++++++++++++++++++++++++++ include/soc/tegra/cpuidle.h | 4 + 5 files changed, 321 insertions(+) create mode 100644 drivers/cpuidle/cpuidle-tegra.c