On Monday, February 02, 2015 08:45:33 PM Hanjun Guo wrote:
From: Graeme Gregory graeme.gregory@linaro.org
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@rjwysocki.net Tested-by: Suravee Suthikulpanit Suravee.Suthikulpanit@amd.com Tested-by: Yijing Wang wangyijing@huawei.com Tested-by: Mark Langsdorf mlangsdo@redhat.com Tested-by: Jon Masters jcm@redhat.com Tested-by: Timur Tabi timur@codeaurora.org Signed-off-by: Graeme Gregory graeme.gregory@linaro.org Signed-off-by: Tomasz Nowicki tomasz.nowicki@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org
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@linaro.org>
- 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/ ?