On Monday, February 02, 2015 08:45:33 PM Hanjun Guo wrote: > From: Graeme Gregory <graeme.gregory@xxxxxxxxxx> > > ACPI 5.1 does not currently support S states for ARM64 hardware but > ACPI code will call acpi_target_system_state() for device power > managment, so introduce sleep_arm.c to allow other drivers to function > until S states are defined. > > CC: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> > Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> > Tested-by: Yijing Wang <wangyijing@xxxxxxxxxx> > Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx> > Tested-by: Jon Masters <jcm@xxxxxxxxxx> > Tested-by: Timur Tabi <timur@xxxxxxxxxxxxxx> > Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx> > Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx> > Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx> > --- > drivers/acpi/Makefile | 4 ++++ > drivers/acpi/sleep_arm.c | 28 ++++++++++++++++++++++++++++ > 2 files changed, 32 insertions(+) > create mode 100644 drivers/acpi/sleep_arm.c > > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index f74317c..bcec54e 100644 > --- a/drivers/acpi/Makefile > +++ b/drivers/acpi/Makefile > @@ -23,7 +23,11 @@ acpi-y += nvs.o > > # Power management related files > acpi-y += wakeup.o > +ifeq ($(ARCH), arm64) > +acpi-y += sleep_arm.o > +else # X86, IA64 > acpi-y += sleep.o > +endif > acpi-y += device_pm.o > acpi-$(CONFIG_ACPI_SLEEP) += proc.o > > diff --git a/drivers/acpi/sleep_arm.c b/drivers/acpi/sleep_arm.c > new file mode 100644 > index 0000000..54578ef > --- /dev/null > +++ b/drivers/acpi/sleep_arm.c > @@ -0,0 +1,28 @@ > +/* > + * ARM64 Specific Sleep Functionality > + * > + * Copyright (C) 2013-2014, Linaro Ltd. > + * Author: Graeme Gregory <graeme.gregory@xxxxxxxxxx> > + * > + * 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. > + */ > + > +#include <linux/acpi.h> > + > +/* > + * Currently the ACPI 5.1 standard does not define S states in a > + * manner which is usable for ARM64. These two stubs are sufficient > + * that system initialises and device PM works. > + */ > +u32 acpi_target_system_state(void) > +{ > + return ACPI_STATE_S0; > +} > +EXPORT_SYMBOL_GPL(acpi_target_system_state); > + > +int __init acpi_sleep_init(void) > +{ > + return -ENOSYS; > +} > Why does this need to be in drivers/acpi/ ? -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html