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authorQuentin Perret <quentin.perret@arm.com>2018-09-10 17:28:10 +0100
committerSudeep Holla <sudeep.holla@arm.com>2018-09-10 17:37:06 +0100
commit1a63fe9a2b1f47af5b2b7436b41824b14999c17a (patch)
treeb9f7f4b738b24ceb09bccad92b7e7266bbdd55e5 /drivers/firmware
parentca64b719a1e665ac7449b6a968059176af7365a8 (diff)
downloadblackbird-op-linux-1a63fe9a2b1f47af5b2b7436b41824b14999c17a.tar.gz
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firmware: arm_scmi: add a getter for power of performance states
The SCMI protocol can be used to get power estimates from firmware corresponding to each performance state of a device. Although these power costs are already managed by the SCMI firmware driver, they are not exposed to any external subsystem yet. Fix this by adding a new get_power() interface to the exisiting perf_ops defined for the SCMI protocol. Signed-off-by: Quentin Perret <quentin.perret@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/arm_scmi/perf.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 87c99d296ecd..3c8ae7cc35de 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -427,6 +427,33 @@ static int scmi_dvfs_freq_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
+static int scmi_dvfs_est_power_get(const struct scmi_handle *handle, u32 domain,
+ unsigned long *freq, unsigned long *power)
+{
+ struct scmi_perf_info *pi = handle->perf_priv;
+ struct perf_dom_info *dom;
+ unsigned long opp_freq;
+ int idx, ret = -EINVAL;
+ struct scmi_opp *opp;
+
+ dom = pi->dom_info + domain;
+ if (!dom)
+ return -EIO;
+
+ for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {
+ opp_freq = opp->perf * dom->mult_factor;
+ if (opp_freq < *freq)
+ continue;
+
+ *freq = opp_freq;
+ *power = opp->power;
+ ret = 0;
+ break;
+ }
+
+ return ret;
+}
+
static struct scmi_perf_ops perf_ops = {
.limits_set = scmi_perf_limits_set,
.limits_get = scmi_perf_limits_get,
@@ -437,6 +464,7 @@ static struct scmi_perf_ops perf_ops = {
.device_opps_add = scmi_dvfs_device_opps_add,
.freq_set = scmi_dvfs_freq_set,
.freq_get = scmi_dvfs_freq_get,
+ .est_power_get = scmi_dvfs_est_power_get,
};
static int scmi_perf_protocol_init(struct scmi_handle *handle)
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