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Commit fe547ce1 authored by Lina Iyer's avatar Lina Iyer
Browse files

firmware: psci: setup OSI mode at init 



Let's switch to OSI mode for QCOM platforms if setting the OSI mode is
supported. We should do this only if the lpm-levels driver is used.
Other VMs using the same kernel but defaulting to ARM cpuidle drivers,
will default to platform coordinated.

Change-Id: I69245bf33361970f37ea2006d669368e30e2ec9d
Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
parent bd0cb901

drivers/cpuidle/Kconfig.arm

+1 −0
Original line number Diff line number Diff line
@@ -92,6 +92,7 @@ config ARM_QCOM_LPM_CPUIDLE 
	select CPU_IDLE_MULTIPLE_DRIVERS

	select MSM_PM

	select QGKI_LPM_IPI_CHECK if QGKI

	select QGKI_PSCI_OSI_SUPPORT if QGKI

	tristate "Qualcomm Technologies, Inc. (QTI) Power Management Drivers"

	help

	  Platform specific power driver to manage cores and cluster low power

drivers/firmware/psci/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -12,3 +12,6 @@ config ARM_PSCI_CHECKER 
	  The torture tests may interfere with the PSCI checker by turning CPUs

	  on and off through hotplug, so for now torture tests and PSCI checker

	  are mutually exclusive.



config QGKI_PSCI_OSI_SUPPORT

	bool "Set PSCI OSI mode"

drivers/firmware/psci/psci.c

+29 −0
Original line number Diff line number Diff line
@@ -536,6 +536,27 @@ static int __init psci_0_1_init(struct device_node *np) 
	return 0;

}



#ifdef CONFIG_QGKI_PSCI_OSI_SUPPORT

static int psci_set_osi_mode(void)

{

	int err;



	/*

	 * If SET_SUSPEND_MODE is not supported,

	 * assume HYP/firmware are defaulting to OSI

	 */

	err = psci_features(PSCI_1_0_FN_SET_SUSPEND_MODE);

	if (err == PSCI_RET_NOT_SUPPORTED) {

		pr_info("Assuming FW runs OSI.\n");

		return 0;

	}



	err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE,

			     PSCI_1_0_SUSPEND_MODE_OSI, 0, 0);

	return psci_to_linux_errno(err);

}

#endif /* CONFIG_QGKI_PSCI_OSI_SUPPORT */



static int __init psci_1_0_init(struct device_node *np)

{

	int err;
@@ -544,8 +565,16 @@ static int __init psci_1_0_init(struct device_node *np) 
	if (err)

		return err;



#ifdef CONFIG_QGKI_PSCI_OSI_SUPPORT

	if (psci_has_osi_support()) {

		pr_info("OSI mode supported.\n");

		if (!psci_set_osi_mode())

			pr_info("Switched to OSI mode.\n");

	}

#else

	if (psci_has_osi_support())

		pr_info("OSI mode supported.\n");

#endif /* CONFIG_QGKI_PSCI_OSI_SUPPORT */



	return 0;

}