Commit 1909872f authored by Nicola Mazzucato's avatar Nicola Mazzucato Committed by Sudeep Holla
Browse files

firmware: arm_scmi: Add fast_switch_possible() interface 

Add a new fast_switch_possible interface to the existing perf_ops to
export the information of whether or not fast_switch is possible for a
given device.

This can be used by the cpufreq driver and framework to choose proper
mechanism for frequency change.

Link: https://lore.kernel.org/r/20200617094332.8391-1-nicola.mazzucato@arm.com


Suggested-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: default avatarNicola Mazzucato <nicola.mazzucato@arm.com>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent bad0d73b

drivers/firmware/arm_scmi/perf.c

+12 −0
Original line number Diff line number Diff line
@@ -697,6 +697,17 @@ static int scmi_dvfs_est_power_get(const struct scmi_handle *handle, u32 domain, 
	return ret;

}



static bool scmi_fast_switch_possible(const struct scmi_handle *handle,

				      struct device *dev)

{

	struct perf_dom_info *dom;

	struct scmi_perf_info *pi = handle->perf_priv;



	dom = pi->dom_info + scmi_dev_domain_id(dev);



	return dom->fc_info && dom->fc_info->level_set_addr;

}



static struct scmi_perf_ops perf_ops = {

	.limits_set = scmi_perf_limits_set,

	.limits_get = scmi_perf_limits_get,
@@ -708,6 +719,7 @@ static struct scmi_perf_ops perf_ops = { 
	.freq_set = scmi_dvfs_freq_set,

	.freq_get = scmi_dvfs_freq_get,

	.est_power_get = scmi_dvfs_est_power_get,

	.fast_switch_possible = scmi_fast_switch_possible,

};



static int scmi_perf_protocol_init(struct scmi_handle *handle)

include/linux/scmi_protocol.h

+2 −0
Original line number Diff line number Diff line
@@ -118,6 +118,8 @@ struct scmi_perf_ops { 
			unsigned long *rate, bool poll);

	int (*est_power_get)(const struct scmi_handle *handle, u32 domain,

			     unsigned long *rate, unsigned long *power);

	bool (*fast_switch_possible)(const struct scmi_handle *handle,

				     struct device *dev);

};



/**