[PATCH v2 5/5] drivers: firmware: psci: Announce support for OS initiated suspend mode
From: Ulf Hansson <hidden>
Date: 2019-03-13 08:37:20
Also in:
linux-arm-msm, linux-pm, lkml
Subsystem:
power state coordination interface (psci), the rest · Maintainers:
Mark Rutland, Lorenzo Pieralisi, Linus Torvalds
PSCI firmware v1.0+, supports two different modes for CPU_SUSPEND. The Platform Coordinated mode, which is the default and mandatory mode, while support for the OS initiated (OSI) mode is optional. In some cases it's interesting for the user/developer to know if the OSI mode is supported by the PSCI FW. Therefore, let's print a message to the log, if that is the case. Cc: Lina Iyer <redacted> Co-developed-by: Lina Iyer <redacted> Signed-off-by: Ulf Hansson <redacted> Reviewed-by: Daniel Lezcano <redacted> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Lorenzo Pieralisi <redacted> --- drivers/firmware/psci/psci.c | 21 ++++++++++++++++++++- include/uapi/linux/psci.h | 5 +++++ 2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index e480e0af632c..eabd01383cd6 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c@@ -95,6 +95,11 @@ static inline bool psci_has_ext_power_state(void) PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK; } +static inline bool psci_has_osi_support(void) +{ + return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED; +} + static inline bool psci_power_state_loses_context(u32 state) { const u32 mask = psci_has_ext_power_state() ?
@@ -659,10 +664,24 @@ static int __init psci_0_1_init(struct device_node *np) return 0; } +static int __init psci_1_0_init(struct device_node *np) +{ + int err; + + err = psci_0_2_init(np); + if (err) + return err; + + if (psci_has_osi_support()) + pr_info("OSI mode supported.\n"); + + return 0; +} + static const struct of_device_id psci_of_match[] __initconst = { { .compatible = "arm,psci", .data = psci_0_1_init}, { .compatible = "arm,psci-0.2", .data = psci_0_2_init}, - { .compatible = "arm,psci-1.0", .data = psci_0_2_init}, + { .compatible = "arm,psci-1.0", .data = psci_1_0_init}, {}, };
diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h
index b3bcabe380da..581f72085c33 100644
--- a/include/uapi/linux/psci.h
+++ b/include/uapi/linux/psci.h@@ -49,6 +49,7 @@ #define PSCI_1_0_FN_PSCI_FEATURES PSCI_0_2_FN(10) #define PSCI_1_0_FN_SYSTEM_SUSPEND PSCI_0_2_FN(14) +#define PSCI_1_0_FN_SET_SUSPEND_MODE PSCI_0_2_FN(15) #define PSCI_1_0_FN64_SYSTEM_SUSPEND PSCI_0_2_FN64(14)
@@ -97,6 +98,10 @@ #define PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK \ (0x1 << PSCI_1_0_FEATURES_CPU_SUSPEND_PF_SHIFT) +#define PSCI_1_0_OS_INITIATED BIT(0) +#define PSCI_1_0_SUSPEND_MODE_PC 0 +#define PSCI_1_0_SUSPEND_MODE_OSI 1 + /* PSCI return values (inclusive of all PSCI versions) */ #define PSCI_RET_SUCCESS 0 #define PSCI_RET_NOT_SUPPORTED -1
--
2.17.1
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