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bh=TG6JOP2J900QufJGXL3SOGbK0BDioW/ee138PuYXujs=; b=berlhbQBDnDZCLEyNtuxg4aYJAipVFUPGGUCjXcI4lU3fWWknog5k5TdQRA2vqg2zf wBC6HiTcUniYtzjxQo/4WiMbSZE7ExmLrtThoV/hs8sj9Q7tAe5CvR4NxwuLdomP15MM acotO0S4miSjpq1vCulrnAw4LLAZf209ifLYfIAnGKgmlKWF6CCUTg7P+wnrk4AfUr6M sq6zEkcuk5jN6IJcJ1lHUZLMZKGGf+x15/95bNhyol/qssxKwJDnRcysJIbkIB2C/aqt VQjAw172FDhr9vHyh34KUbMvWNHJ/TTg7+hbRY91jr1Ya32xd5z+N5PdMYXPyrQEWh6n +T5g== X-Gm-Message-State: ABy/qLa49E4lSYXVeIlgcS67Y/CgDxlzqUNMrFL9r3CQBe4tyPgl38To 7tWdsiKn03zJ9K9WtT1uFONT X-Received: by 2002:a05:6e02:1a8a:b0:345:6e49:30d2 with SMTP id k10-20020a056e021a8a00b003456e4930d2mr6548275ilv.10.1690177593359; Sun, 23 Jul 2023 22:46:33 -0700 (PDT) Received: from thinkpad ([117.206.118.29]) by smtp.gmail.com with ESMTPSA id s9-20020a63af49000000b0055ff89c5453sm7459240pgo.6.2023.07.23.22.46.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Jul 2023 22:46:32 -0700 (PDT) Date: Mon, 24 Jul 2023 11:16:11 +0530 From: Manivannan Sadhasivam To: Chanwoo Choi Cc: vireshk@kernel.org, nm@ti.com, sboyd@kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com, cw00.choi@samsung.com, andersson@kernel.org, konrad.dybcio@linaro.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, alim.akhtar@samsung.com, avri.altman@wdc.com, bvanassche@acm.org, linux-scsi@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, quic_asutoshd@quicinc.com, quic_cang@quicinc.com, quic_nitirawa@quicinc.com, quic_narepall@quicinc.com, quic_bhaskarv@quicinc.com, quic_richardp@quicinc.com, quic_nguyenb@quicinc.com, quic_ziqichen@quicinc.com, bmasney@redhat.com, krzysztof.kozlowski@linaro.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 09/15] PM / devfreq: Switch to dev_pm_opp_find_freq_{ceil/floor}_indexed() APIs Message-ID: <20230724054611.GA2370@thinkpad> References: <20230720054100.9940-1-manivannan.sadhasivam@linaro.org> <20230720054100.9940-10-manivannan.sadhasivam@linaro.org> <1703ab6e-8567-8574-f011-af19813f97e8@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1703ab6e-8567-8574-f011-af19813f97e8@kernel.org> X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 24, 2023 at 05:06:04AM +0900, Chanwoo Choi wrote: > Hi, > > On 23. 7. 20. 14:40, Manivannan Sadhasivam wrote: > > Some devfreq consumers like UFS driver need to work with multiple clocks > > through the OPP framework. For this reason, OPP framework exposes the > > _indexed() APIs for finding the floor/ceil of the supplied frequency of > > the indexed clock. So let's use them in the devfreq driver. > > > > Currently, the clock index of 0 is used which works fine for multiple as > > well as single clock. > > > > Signed-off-by: Manivannan Sadhasivam > > --- > > drivers/devfreq/devfreq.c | 14 +++++++------- > > 1 file changed, 7 insertions(+), 7 deletions(-) > > > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > > index e36cbb920ec8..7686993d639f 100644 > > --- a/drivers/devfreq/devfreq.c > > +++ b/drivers/devfreq/devfreq.c > > @@ -88,7 +88,7 @@ static unsigned long find_available_min_freq(struct devfreq *devfreq) > > struct dev_pm_opp *opp; > > unsigned long min_freq = 0; > > > > - opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); > > + opp = dev_pm_opp_find_freq_ceil_indexed(devfreq->dev.parent, &min_freq, 0); > > This patch changed the used function from dev_pm_opp_find_freq_ceil > to dev_pm_opp_find_freq_ceil_indexed even if there are no supporting of the multiple clocks > and then dev_pm_opp_find_freq_ceil is not removed from OPP. > > I think that it is better to use dev_pm_opp_find_freq_ceil_indexed > when need to support multiple clocks with real case. > There is the user for dev_pm_opp_find_freq_ceil_indexed() which is the UFS driver and since UFS is using devfreq, we need this change. I've added this info in the commit message as well. What am I missing? - Mani > > if (IS_ERR(opp)) > > min_freq = 0; > > else > > @@ -102,7 +102,7 @@ static unsigned long find_available_max_freq(struct devfreq *devfreq) > > struct dev_pm_opp *opp; > > unsigned long max_freq = ULONG_MAX; > > > > - opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); > > + opp = dev_pm_opp_find_freq_floor_indexed(devfreq->dev.parent, &max_freq, 0); > > if (IS_ERR(opp)) > > max_freq = 0; > > else > > @@ -196,7 +196,7 @@ static int set_freq_table(struct devfreq *devfreq) > > return -ENOMEM; > > > > for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { > > - opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); > > + opp = dev_pm_opp_find_freq_ceil_indexed(devfreq->dev.parent, &freq, 0); > > if (IS_ERR(opp)) { > > devm_kfree(devfreq->dev.parent, devfreq->freq_table); > > return PTR_ERR(opp); > > @@ -2034,18 +2034,18 @@ struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, > > > > if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { > > /* The freq is an upper bound. opp should be lower */ > > - opp = dev_pm_opp_find_freq_floor(dev, freq); > > + opp = dev_pm_opp_find_freq_floor_indexed(dev, freq, 0); > > > > /* If not available, use the closest opp */ > > if (opp == ERR_PTR(-ERANGE)) > > - opp = dev_pm_opp_find_freq_ceil(dev, freq); > > + opp = dev_pm_opp_find_freq_ceil_indexed(dev, freq, 0); > > } else { > > /* The freq is an lower bound. opp should be higher */ > > - opp = dev_pm_opp_find_freq_ceil(dev, freq); > > + opp = dev_pm_opp_find_freq_ceil_indexed(dev, freq, 0); > > > > /* If not available, use the closest opp */ > > if (opp == ERR_PTR(-ERANGE)) > > - opp = dev_pm_opp_find_freq_floor(dev, freq); > > + opp = dev_pm_opp_find_freq_floor_indexed(dev, freq, 0); > > } > > > > return opp; > > -- > Best Regards, > Samsung Electronics > Chanwoo Choi > -- மணிவண்ணன் சதாசிவம்