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| author | Nicola Mazzucato <nicola.mazzucato@arm.com> | 2020-06-17 12:43:31 +0300 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2020-06-30 16:07:15 +0300 |
| commit | 1909872ff20fc378ec6a44ea1a2b2966d834e504 (patch) | |
| tree | 9d8a474d2786d42fe5d70774d6f9c7a4a7c016a0 | |
| parent | bad0d73b657412058c4d7773ff0d50291bfe1905 (diff) | |
| download | linux-1909872ff20fc378ec6a44ea1a2b2966d834e504.tar.xz | |
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: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
| -rw-r--r-- | drivers/firmware/arm_scmi/perf.c | 12 | ||||
| -rw-r--r-- | include/linux/scmi_protocol.h | 2 |
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c index eadc171e254b..7b8d7cebdac9 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..73911d156a39 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); }; /** |