On 03-02-21, 17:23, Hsin-Yi Wang wrote:
> From: Saravana Kannan <sarava...@google.com>
>
> Add a function that allows looking up required OPPs given a source OPP
> table, destination OPP table and the source OPP.
>
> Signed-off-by: Saravana Kannan <sarava...@google.com>
> Signed-off-by: Hsin-Yi Wang <hsi...@chromium.org>
> ---
> drivers/opp/core.c | 58 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/pm_opp.h | 11 ++++++++
> 2 files changed, 69 insertions(+)
>
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index dc95d29e94c1b..878f066b972cc 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -2398,6 +2398,64 @@ devm_pm_opp_attach_genpd(struct device *dev, const
> char **names,
> }
> EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd);
>
> +/**
> + * dev_pm_opp_xlate_required_opp() - Find required OPP for @src_table OPP.
> + * @src_table: OPP table which has @dst_table as one of its required OPP
> table.
> + * @dst_table: Required OPP table of the @src_table.
> + *
> + * This function returns the OPP (present in @dst_table) pointed out by the
> + * "required-opps" property of the OPP (present in @src_table).
> + *
> + * The callers are required to call dev_pm_opp_put() for the returned OPP
> after
> + * use.
> + *
> + * Return: destination table OPP on success, otherwise NULL on errors.
> + */
> +struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table,
> + struct opp_table *dst_table,
> + struct dev_pm_opp *src_opp)
> +{
> + struct dev_pm_opp *opp, *dest_opp = NULL;
> + int i;
> +
> + if (!src_table || !dst_table || !src_opp ||
> + !src_table->required_opp_tables)
> + return NULL;
> +
> + /* required-opps not fully initialized yet */
> + if (lazy_linking_pending(src_table))
> + return NULL;
> +
> + for (i = 0; i < src_table->required_opp_count; i++) {
> + if (src_table->required_opp_tables[i] == dst_table)
> + break;
> + }
> +
> + if (unlikely(i == src_table->required_opp_count)) {
> + pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
> + __func__, src_table, dst_table);
> + return NULL;
> + }
> +
> + mutex_lock(&src_table->lock);
> +
> + list_for_each_entry(opp, &src_table->opp_list, node) {
> + if (opp == src_opp) {
> + dest_opp = opp->required_opps[i];
> + dev_pm_opp_get(dest_opp);
> + goto unlock;
> + }
> + }
> +
> + pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
> + dst_table);
> +
> +unlock:
> + mutex_unlock(&src_table->lock);
> +
> + return dest_opp;
> +}
> +
> /**
> * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for
> src_table.
> * @src_table: OPP table which has dst_table as one of its required OPP
> table.
> diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
> index ab1d15ce559db..6f5f72a7f601c 100644
> --- a/include/linux/pm_opp.h
> +++ b/include/linux/pm_opp.h
> @@ -156,6 +156,9 @@ struct opp_table
> *devm_pm_opp_register_set_opp_helper(struct device *dev, int (*
> struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char
> **names, struct device ***virt_devs);
> void dev_pm_opp_detach_genpd(struct opp_table *opp_table);
> struct opp_table *devm_pm_opp_attach_genpd(struct device *dev, const char
> **names, struct device ***virt_devs);
> +struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table,
> + struct opp_table *dst_table,
> + struct dev_pm_opp *src_opp);
> int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct
> opp_table *dst_table, unsigned int pstate);
> int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
> int dev_pm_opp_set_opp(struct device *dev, struct dev_pm_opp *opp);
> @@ -367,6 +370,14 @@ static inline struct opp_table
> *devm_pm_opp_attach_genpd(struct device *dev,
> return ERR_PTR(-EOPNOTSUPP);
> }
>
> +static inline struct dev_pm_opp *dev_pm_opp_xlate_required_opp(
> + struct opp_table *src_table,
> + struct opp_table *dst_table,
> + struct dev_pm_opp *src_opp)
> +{
> + return NULL;
> +}
Like other routines that return opp *, don't return NULL on errors but
a valid error number instead. And follow the declaration format of
other routines from this file, don't break lines etc..
> +
> static inline int dev_pm_opp_xlate_performance_state(struct opp_table
> *src_table, struct opp_table *dst_table, unsigned int pstate)
> {
> return -EOPNOTSUPP;
> --
> 2.30.0.365.g02bc693789-goog
--
viresh
