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[46.138.85.91]) by smtp.gmail.com with ESMTPSA id g30sm46607lfj.298.2021.08.16.18.30.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Aug 2021 18:30:02 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Ulf Hansson , Viresh Kumar , Stephen Boyd , Peter De Schrijver , Mikko Perttunen , Peter Chen , Mark Brown , Lee Jones , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Nishanth Menon , Vignesh Raghavendra , Richard Weinberger , Miquel Raynal , Lucas Stach , Stefan Agner , Adrian Hunter , Mauro Carvalho Chehab , Rob Herring , Michael Turquette Cc: linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, linux-staging@lists.linux.dev, linux-spi@vger.kernel.org, linux-pwm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper Date: Tue, 17 Aug 2021 04:27:21 +0300 Message-Id: <20210817012754.8710-2-digetx@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210817012754.8710-1-digetx@gmail.com> References: <20210817012754.8710-1-digetx@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Add dev_pm_opp_sync() helper which syncs OPP table with hardware state and vice versa. Signed-off-by: Dmitry Osipenko --- drivers/opp/core.c | 42 +++++++++++++++++++++++++++++++++++++++--- include/linux/pm_opp.h | 6 ++++++ 2 files changed, 45 insertions(+), 3 deletions(-) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 5543c54dacc5..18016e49605f 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -939,7 +939,8 @@ static int _set_required_opps(struct device *dev, return ret; } -static void _find_current_opp(struct device *dev, struct opp_table *opp_table) +static struct dev_pm_opp * +_find_current_opp(struct device *dev, struct opp_table *opp_table) { struct dev_pm_opp *opp = ERR_PTR(-ENODEV); unsigned long freq; @@ -961,7 +962,7 @@ static void _find_current_opp(struct device *dev, struct opp_table *opp_table) mutex_unlock(&opp_table->lock); } - opp_table->current_opp = opp; + return opp; } static int _disable_opp_table(struct device *dev, struct opp_table *opp_table) @@ -1003,7 +1004,7 @@ static int _set_opp(struct device *dev, struct opp_table *opp_table, /* Find the currently set OPP if we don't know already */ if (unlikely(!opp_table->current_opp)) - _find_current_opp(dev, opp_table); + opp_table->current_opp = _find_current_opp(dev, opp_table); old_opp = opp_table->current_opp; @@ -2931,3 +2932,38 @@ int dev_pm_opp_sync_regulators(struct device *dev) return ret; } EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators); + +/** + * dev_pm_opp_sync() - Sync OPP state + * @dev: device for which we do this operation + * + * Initialize OPP table accordingly to current clock rate or + * first available OPP if clock not available for this device. + * + * Return: 0 on success or a negative error value. + */ +int dev_pm_opp_sync(struct device *dev) +{ + struct opp_table *opp_table; + struct dev_pm_opp *opp; + int ret = 0; + + /* Device may not have OPP table */ + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) + return 0; + + if (!_get_opp_count(opp_table)) + goto put_table; + + opp = _find_current_opp(dev, opp_table); + ret = _set_opp(dev, opp_table, opp, opp->rate); + dev_pm_opp_put(opp); + +put_table: + /* Drop reference taken by _find_opp_table() */ + dev_pm_opp_put_opp_table(opp_table); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_sync); diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 84150a22fd7c..686122b59935 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -168,6 +168,7 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) void dev_pm_opp_remove_table(struct device *dev); void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask); int dev_pm_opp_sync_regulators(struct device *dev); +int dev_pm_opp_sync(struct device *dev); #else static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) { @@ -434,6 +435,11 @@ static inline int dev_pm_opp_sync_regulators(struct device *dev) return -EOPNOTSUPP; } +static inline int dev_pm_opp_sync(struct device *dev) +{ + return -EOPNOTSUPP; +} + #endif /* CONFIG_PM_OPP */ #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)