drivers: firmware: psci: add PSCI_FEATURES call (5f004e0c) · Commits · 戴 / test

PSCI v1.0 introduces a PSCI_FEATURES call that allows to probe for features related to a specific function identifier. This patch adds PSCI_FEATURES support to the PSCI firmware layer. Signed-off-by:

Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Tested-by:

Jisheng Zhang <jszhang@marvell.com> Cc: Mark Rutland <mark.rutland@arm.com>

drivers/firmware/psci.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -197,6 +197,12 @@ static void psci_sys_poweroff(void)
		invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
		}

		static int __init psci_features(u32 psci_func_id)
		{
		return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
		psci_func_id, 0, 0);
		}

		/*
		* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
		* return DENIED (which would be fatal).

include/uapi/linux/psci.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -46,6 +46,8 @@
		#define PSCI_0_2_FN64_MIGRATE PSCI_0_2_FN64(5)
		#define PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU PSCI_0_2_FN64(7)

		#define PSCI_1_0_FN_PSCI_FEATURES PSCI_0_2_FN(10)

		/* PSCI v0.2 power state encoding for CPU_SUSPEND function */
		#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff
		#define PSCI_0_2_POWER_STATE_ID_SHIFT 0

Admin message