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Wysocki" , linux-kernel@vger.kernel.org, MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Saravana Kannan Subject: [PATCH v6 3/3] PM / devfreq: Add required OPPs support to passive governor Date: Thu, 4 Feb 2021 16:14:24 +0800 Message-Id: <20210204081424.2219311-4-hsinyi@chromium.org> X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog In-Reply-To: <20210204081424.2219311-1-hsinyi@chromium.org> References: <20210204081424.2219311-1-hsinyi@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Saravana Kannan Look at the required OPPs of the "parent" device to determine the OPP that is required from the slave device managed by the passive governor. This allows having mappings between a parent device and a slave device even when they don't have the same number of OPPs. Signed-off-by: Saravana Kannan Acked-by: MyungJoo Ham Acked-by: Chanwoo Choi Signed-off-by: Hsin-Yi Wang --- drivers/devfreq/governor_passive.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 63332e4a65ae8..8fd51cc9b991a 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -19,7 +19,7 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq, = (struct devfreq_passive_data *)devfreq->data; struct devfreq *parent_devfreq = (struct devfreq *)p_data->parent; unsigned long child_freq = ULONG_MAX; - struct dev_pm_opp *opp; + struct dev_pm_opp *opp, *p_opp = ERR_PTR(-ENODEV); int i, count, ret = 0; /* @@ -29,7 +29,7 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq, */ if (p_data->get_target_freq) { ret = p_data->get_target_freq(devfreq, freq); - goto out; + return ret; } /* @@ -56,13 +56,22 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq, * list of parent device. Because in this case, *freq is temporary * value which is decided by ondemand governor. */ - opp = devfreq_recommended_opp(parent_devfreq->dev.parent, freq, 0); - if (IS_ERR(opp)) { - ret = PTR_ERR(opp); - goto out; + p_opp = devfreq_recommended_opp(parent_devfreq->dev.parent, freq, 0); + if (IS_ERR(p_opp)) { + ret = PTR_ERR(p_opp); + return ret; } - dev_pm_opp_put(opp); + if (devfreq->opp_table && parent_devfreq->opp_table) { + opp = dev_pm_opp_xlate_required_opp(parent_devfreq->opp_table, + devfreq->opp_table, p_opp); + if (!IS_ERR(opp)) { + *freq = dev_pm_opp_get_freq(opp); + dev_pm_opp_put(opp); + } else + ret = PTR_ERR(opp); + goto out; + } /* * Get the OPP table's index of decided freqeuncy by governor @@ -89,6 +98,8 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq, *freq = child_freq; out: + dev_pm_opp_put(p_opp); + return ret; }