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Date: Fri, 12 Oct 2018 17:11:39 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
Stephen Boyd <sboyd@...nel.org>,
Linux PM <linux-pm@...r.kernel.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Rafael Wysocki <rjw@...ysocki.net>,
Niklas Cassel <niklas.cassel@...aro.org>,
Rajendra Nayak <rnayak@...eaurora.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 4/9] OPP: Populate OPPs from "required-opps" property
On 12 October 2018 at 13:11, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> An earlier commit populated the OPP tables from the "required-opps"
> property, this commit populates the individual OPPs. This is repeated
> for each OPP in the OPP table and these populated OPPs will be used by
> later commits.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
> drivers/opp/core.c | 1 +
> drivers/opp/of.c | 81 ++++++++++++++++++++++++++++++++++++++++++++--
> drivers/opp/opp.h | 6 ++++
> 3 files changed, 86 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 85174a5c4850..02a69a62dac8 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -976,6 +976,7 @@ static void _opp_kref_release(struct kref *kref)
> * frequency/voltage list.
> */
> blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
> + _of_opp_free_required_opps(opp_table, opp);
> opp_debug_remove_one(opp);
> list_del(&opp->node);
> kfree(opp);
> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> index b5605196122a..ffaeefef98ce 100644
> --- a/drivers/opp/of.c
> +++ b/drivers/opp/of.c
> @@ -259,6 +259,77 @@ void _of_clear_opp_table(struct opp_table *opp_table)
> _opp_table_free_required_tables(opp_table);
> }
>
> +/*
> + * Release all resources previously acquired with a call to
> + * _of_opp_alloc_required_opps().
> + */
> +void _of_opp_free_required_opps(struct opp_table *opp_table,
> + struct dev_pm_opp *opp)
> +{
> + struct dev_pm_opp **required_opps = opp->required_opps;
> + int i;
> +
> + if (!required_opps)
> + return;
> +
> + for (i = 0; i < opp_table->required_opp_count; i++) {
> + if (!required_opps[i])
> + break;
> +
> + /* Put the reference back */
> + dev_pm_opp_put(required_opps[i]);
> + }
> +
> + kfree(required_opps);
> + opp->required_opps = NULL;
> +}
> +
> +/* Populate all required OPPs which are part of "required-opps" list */
> +static int _of_opp_alloc_required_opps(struct opp_table *opp_table,
> + struct dev_pm_opp *opp)
> +{
> + struct dev_pm_opp **required_opps;
> + struct opp_table *required_table;
> + struct device_node *np;
> + int i, ret, count = opp_table->required_opp_count;
> +
> + if (!count)
> + return 0;
> +
> + required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL);
> + if (!required_opps)
> + return -ENOMEM;
> +
> + opp->required_opps = required_opps;
> +
> + for (i = 0; i < count; i++) {
> + required_table = opp_table->required_opp_tables[i];
> +
> + np = of_parse_required_opp(opp->np, i);
> + if (unlikely(!np)) {
> + ret = -ENODEV;
> + goto free_required_opps;
> + }
> +
> + required_opps[i] = _find_opp_of_np(required_table, np);
> + of_node_put(np);
> +
> + if (!required_opps[i]) {
> + pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
> + __func__, opp->np, i);
> + ret = -ENODEV;
> + goto free_required_opps;
> + }
> + }
> +
> + return 0;
> +
> +free_required_opps:
> + _of_opp_free_required_opps(opp_table, opp);
> +
> + return ret;
> +}
> +
> static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
> struct device_node *np)
> {
> @@ -503,6 +574,10 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
> new_opp->dynamic = false;
> new_opp->available = true;
>
> + ret = _of_opp_alloc_required_opps(opp_table, new_opp);
> + if (ret)
> + goto free_opp;
> +
> if (!of_property_read_u32(np, "clock-latency-ns", &val))
> new_opp->clock_latency_ns = val;
>
> @@ -510,14 +585,14 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
>
> ret = opp_parse_supplies(new_opp, dev, opp_table);
> if (ret)
> - goto free_opp;
> + goto free_required_opps;
>
> ret = _opp_add(dev, new_opp, opp_table, rate_not_available);
> if (ret) {
> /* Don't return error for duplicate OPPs */
> if (ret == -EBUSY)
> ret = 0;
> - goto free_opp;
> + goto free_required_opps;
> }
>
> /* OPP to select on device suspend */
> @@ -547,6 +622,8 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
> blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
> return new_opp;
>
> +free_required_opps:
> + _of_opp_free_required_opps(opp_table, new_opp);
> free_opp:
> _opp_free(new_opp);
>
> diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
> index 024e1be23d37..24b340ad18d1 100644
> --- a/drivers/opp/opp.h
> +++ b/drivers/opp/opp.h
> @@ -63,6 +63,7 @@ extern struct list_head opp_tables;
> * @supplies: Power supplies voltage/current values
> * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
> * frequency from any other OPP's frequency.
> + * @required_opps: List of OPPs that are required by this OPP.
> * @opp_table: points back to the opp_table struct this opp belongs to
> * @np: OPP's device node.
> * @dentry: debugfs dentry pointer (per opp)
> @@ -84,6 +85,7 @@ struct dev_pm_opp {
>
> unsigned long clock_latency_ns;
>
> + struct dev_pm_opp **required_opps;
> struct opp_table *opp_table;
>
> struct device_node *np;
> @@ -216,10 +218,14 @@ void _put_opp_list_kref(struct opp_table *opp_table);
> void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index);
> void _of_clear_opp_table(struct opp_table *opp_table);
> struct opp_table *_managed_opp(struct device *dev, int index);
> +void _of_opp_free_required_opps(struct opp_table *opp_table,
> + struct dev_pm_opp *opp);
> #else
> static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {}
> static inline void _of_clear_opp_table(struct opp_table *opp_table) {}
> static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; }
> +static inline void _of_opp_free_required_opps(struct opp_table *opp_table,
> + struct dev_pm_opp *opp) {}
> #endif
>
> #ifdef CONFIG_DEBUG_FS
> --
> 2.18.0.rc1.242.g61856ae69a2c
>
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