lkml.org 
[lkml]   [2020]   [Jun]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] firmware: arm_scmi: Add fast_switch_possible() api
Date
Add a new fast_switch_possible interface to the existing
perf_ops api to export the information of whether or not
fast_switch is possible in this driver.

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

Suggested-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
---
drivers/firmware/arm_scmi/perf.c | 12 ++++++++++++
include/linux/scmi_protocol.h | 2 ++
2 files changed, 14 insertions(+)

diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index eadc171e254b..ef747a9bb948 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -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)
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index ce2f5c28b2df..19e50b89117e 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -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);
};

/**
--
2.27.0
\
 
 \ /
  Last update: 2020-06-17 11:44    [W:2.857 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site