Commit 10942019 authored by Ulf Hansson's avatar Ulf Hansson Committed by Rafael J. Wysocki
Browse files

firmware: psci: Extend psci_set_osi_mode() to allow reset to PC mode 



The current user (cpuidle-psci) of psci_set_osi_mode() only needs to enable
the PSCI OSI mode. Although, as subsequent changes shows, there is a need
to be able to reset back into the PSCI PC mode.

Therefore, let's extend psci_set_osi_mode() to take a bool as in-parameter,
to let the user indicate whether to enable OSI or to switch back to PC
mode.

Reviewed-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 653f68b6

drivers/cpuidle/cpuidle-psci-domain.c

+1 −1
Original line number Diff line number Diff line
@@ -278,7 +278,7 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev) 
		goto remove_pd;



	/* Try to enable OSI mode. */

	ret = psci_set_osi_mode();

	ret = psci_set_osi_mode(true);

	if (ret) {

		pr_warn("failed to enable OSI mode: %d\n", ret);

		psci_pd_remove_topology(np);

drivers/firmware/psci/psci.c

+7 −5
Original line number Diff line number Diff line
@@ -151,12 +151,15 @@ static u32 psci_get_version(void) 
	return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);

}



int psci_set_osi_mode(void)

int psci_set_osi_mode(bool enable)

{

	unsigned long suspend_mode;

	int err;



	err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE,

			     PSCI_1_0_SUSPEND_MODE_OSI, 0, 0);

	suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI :

			PSCI_1_0_SUSPEND_MODE_PC;



	err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);

	return psci_to_linux_errno(err);

}
@@ -546,8 +549,7 @@ static int __init psci_1_0_init(struct device_node *np) 
		pr_info("OSI mode supported.\n");



		/* Default to PC mode. */

		invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE,

			       PSCI_1_0_SUSPEND_MODE_PC, 0, 0);

		psci_set_osi_mode(false);

	}



	return 0;

include/linux/psci.h

+1 −1
Original line number Diff line number Diff line
@@ -18,7 +18,7 @@ bool psci_tos_resident_on(int cpu); 


int psci_cpu_suspend_enter(u32 state);

bool psci_power_state_is_valid(u32 state);

int psci_set_osi_mode(void);

int psci_set_osi_mode(bool enable);

bool psci_has_osi_support(void);



struct psci_operations {

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