Merge "coresight: add support for cti save disable" (da785251) · Commits · e / devices / android_kernel_sony_msm8994

drivers/coresight/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -49,6 +49,16 @@ config CORESIGHT_CTI
		hardware component to another. It can also be used to pass
		software generated events.

		config CORESIGHT_CTI_SAVE_DISABLE
		bool "Turn off CTI save and restore"
		help
		Turns off CoreSight CTI save and restore support for cpu CTIs. This
		avoids voting for the clocks during probe as well as the associated
		save and restore latency at the cost of breaking cpu CTI support on
		targets where cpu CTIs have to be preserved across power collapse.

		If unsure, say 'N' here to avoid breaking cpu CTI support.

		config CORESIGHT_CSR
		bool "CoreSight Slave Register driver"
		help

+22 −1

Original line number	Diff line number	Diff line
		@@ -102,6 +102,11 @@ struct cti_drvdata {

		static LIST_HEAD(cti_list);
		static DEFINE_MUTEX(cti_lock);
		#ifdef CONFIG_CORESIGHT_CTI_SAVE_DISABLE
		static int cti_save_disable = 1;
		#else
		static int cti_save_disable;
		#endif

		static int cti_verify_trigger_bound(int trig)
		{
		@@ -134,6 +139,14 @@ void coresight_cti_ctx_save(void)
		int trig, cpuid, cpu;
		unsigned long flag;

		/*
		* Explicitly check and return to avoid latency associated with
		* traversing the linked list of all CTIs and checking for their
		* respective cti_save flag.
		*/
		if (cti_save_disable)
		return;

		cpu = raw_smp_processor_id();

		list_for_each_entry(cti, &cti_list, link) {
		@@ -170,6 +183,14 @@ void coresight_cti_ctx_restore(void)
		int trig, cpuid, cpu;
		unsigned long flag;

		/*
		* Explicitly check and return to avoid latency associated with
		* traversing the linked list of all CTIs and checking for their
		* respective cti_save flag.
		*/
		if (cti_save_disable)
		return;

		cpu = raw_smp_processor_id();

		list_for_each_entry(cti, &cti_list, link) {
		@@ -1378,7 +1399,7 @@ static int cti_probe(struct platform_device *pdev)
		}
		}

		if (pdev->dev.of_node)
		if (pdev->dev.of_node && !cti_save_disable)
		drvdata->cti_save = of_property_read_bool(pdev->dev.of_node,
		"qcom,cti-save");
		if (drvdata->cti_save) {