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| author | Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com> | 2025-08-20 11:28:47 +0300 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2025-08-26 08:10:58 +0300 |
| commit | 05db35963eef7a55f1782190185cb8ddb9d923b7 (patch) | |
| tree | e58cbcde027f7a30ce600d4a7c33ea7d32464b18 /include | |
| parent | 22763c35c635466545c0cea825da01c72becbcea (diff) | |
| download | linux-05db35963eef7a55f1782190185cb8ddb9d923b7.tar.xz | |
OPP: Add support to find OPP for a set of keys
Some clients, such as PCIe, may operate at the same clock frequency
across different data rates by varying link width. In such cases,
frequency alone is not sufficient to uniquely identify an OPP.
To support these scenarios, introduce a new API
dev_pm_opp_find_key_exact() that allows OPP lookup with different
set of keys like freq, level & bandwidth.
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
[ Viresh: Minor cleanups ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pm_opp.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index cf477beae4bb..789406d95e69 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -98,6 +98,25 @@ struct dev_pm_opp_data { unsigned long u_volt; }; +/** + * struct dev_pm_opp_key - Key used to identify OPP entries + * @freq: Frequency in Hz. Use 0 if frequency is not to be matched. + * @level: Performance level associated with the OPP entry. + * Use OPP_LEVEL_UNSET if level is not to be matched. + * @bw: Bandwidth associated with the OPP entry. + * Use 0 if bandwidth is not to be matched. + * + * This structure is used to uniquely identify an OPP entry based on + * frequency, performance level, and bandwidth. Each field can be + * selectively ignored during matching by setting it to its respective + * NOP value. + */ +struct dev_pm_opp_key { + unsigned long freq; + unsigned int level; + u32 bw; +}; + #if defined(CONFIG_PM_OPP) struct opp_table *dev_pm_opp_get_opp_table(struct device *dev); @@ -131,6 +150,10 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, unsigned long freq, bool available); +struct dev_pm_opp *dev_pm_opp_find_key_exact(struct device *dev, + struct dev_pm_opp_key *key, + bool available); + struct dev_pm_opp * dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq, u32 index, bool available); @@ -289,6 +312,13 @@ static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, return ERR_PTR(-EOPNOTSUPP); } +static inline struct dev_pm_opp *dev_pm_opp_find_key_exact(struct device *dev, + struct dev_pm_opp_key *key, + bool available) +{ + return ERR_PTR(-EOPNOTSUPP); +} + static inline struct dev_pm_opp * dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq, u32 index, bool available) |