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Wysocki" , linux-kernel@vger.kernel.org Subject: [PATCH V2 5/5] OPP: decouple dt properties in opp_parse_supplies() Date: Thu, 3 Nov 2022 16:31:08 +0530 Message-Id: <5acd93462bff6c108d65802fd39f6002dfadd1a0.1667473008.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.31.1.272.g89b43f80a514 In-Reply-To: References: MIME-Version: 1.0 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 autolearn=ham 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 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1748472964773558890?= X-GMAIL-MSGID: =?utf-8?q?1748472964773558890?= From: James Calligeros The opp-microwatt property was added with the intention of providing platforms a way to specify a precise value for the power consumption of a device at a given OPP to enable better energy-aware scheduling decisions by informing the kernel of the total static and dynamic power of a device at a given OPP, removing the reliance on the EM subsystem's often flawed estimations. This property is parsed by opp_parse_supplies(), which creates a hard dependency on the opp-microvolt property. Some platforms, such as Apple Silicon, do not describe their device's voltage regulators in the DT as they cannot be controlled by the kernel and/or rely on opaque firmware algorithms to control their voltage and current characteristics at runtime. We can, however, experimentally determine the power consumption of a given device at a given OPP, taking advantage of opp-microwatt to provide EAS on such devices as was initially intended. Allow platforms to specify and consume any subset of opp-microvolt, opp-microamp, or opp-microwatt without a hard dependency on opp-microvolt to enable this functionality on such platforms. Signed-off-by: James Calligeros Co-developed-by: Viresh Kumar Signed-off-by: Viresh Kumar Tested-by: James Calligeros --- V2: Rewritten by Viresh on top of his changes. drivers/opp/of.c | 36 +++++++++++++++++++++++++----------- 1 file changed, 25 insertions(+), 11 deletions(-) diff --git a/drivers/opp/of.c b/drivers/opp/of.c index e51c43495e21..273fa9c0e1c0 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -654,9 +654,12 @@ static u32 *opp_parse_microvolt(struct dev_pm_opp *opp, struct device *dev, /* * Missing property isn't a problem, but an invalid * entry is. This property isn't optional if regulator - * information is provided. + * information is provided. Check only for the first OPP, as + * regulator_count may get initialized after that to a valid + * value. */ - if (opp_table->regulator_count > 0) { + if (list_empty(&opp_table->opp_list) && + opp_table->regulator_count > 0) { dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n", __func__); return ERR_PTR(-EINVAL); @@ -674,7 +677,7 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, bool triplet; microvolt = opp_parse_microvolt(opp, dev, opp_table, &triplet); - if (IS_ERR_OR_NULL(microvolt)) + if (IS_ERR(microvolt)) return PTR_ERR(microvolt); microamp = _parse_named_prop(opp, dev, opp_table, "microamp", NULL); @@ -689,15 +692,26 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, goto free_microamp; } - for (i = 0, j = 0; i < opp_table->regulator_count; i++) { - opp->supplies[i].u_volt = microvolt[j++]; + /* + * Initialize regulator_count if it is uninitialized and no properties + * are found. + */ + if (unlikely(opp_table->regulator_count == -1)) { + opp_table->regulator_count = 0; + return 0; + } - if (triplet) { - opp->supplies[i].u_volt_min = microvolt[j++]; - opp->supplies[i].u_volt_max = microvolt[j++]; - } else { - opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; - opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; + for (i = 0, j = 0; i < opp_table->regulator_count; i++) { + if (microvolt) { + opp->supplies[i].u_volt = microvolt[j++]; + + if (triplet) { + opp->supplies[i].u_volt_min = microvolt[j++]; + opp->supplies[i].u_volt_max = microvolt[j++]; + } else { + opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; + opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; + } } if (microamp)