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| author | Quentin Perret <quentin.perret@arm.com> | 2018-09-10 18:28:10 +0200 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2018-09-10 18:37:06 +0200 |
| commit | 1a63fe9a2b1f47af5b2b7436b41824b14999c17a (patch) | |
| tree | b9f7f4b738b24ceb09bccad92b7e7266bbdd55e5 /drivers/firmware | |
| parent | firmware: arm_scmi: use strlcpy to ensure NULL-terminated strings (diff) | |
| download | linux-1a63fe9a2b1f47af5b2b7436b41824b14999c17a.tar.xz linux-1a63fe9a2b1f47af5b2b7436b41824b14999c17a.zip | |
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.c | 28 |
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) |