From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64ED4C35240 for ; Wed, 29 Jan 2020 13:49:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 39AD62082E for ; Wed, 29 Jan 2020 13:49:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="OnfUsUx5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726484AbgA2Ntu (ORCPT ); Wed, 29 Jan 2020 08:49:50 -0500 Received: from mail26.static.mailgun.info ([104.130.122.26]:17775 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726261AbgA2Ntu (ORCPT ); Wed, 29 Jan 2020 08:49:50 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1580305789; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=+GsoW3Ht6gEeRhdmfArROpfXpxG5uRnhOhHDj5W5KcU=; b=OnfUsUx5a8ARUFxGeBT6wJgJosGS85mVqHeNqjOSpfGJwsIRBSCCHY3yil4Ktl25hxNWBIgA oR+zA+BIy4dnf2rzgcSVBbkMLRE0xAFk+l94A7wD965RKp8tOLVgv0ku2QuEZAsyf7zfNhPB 2oUZa9wpA0yX/O3zDuMXdACuSWI= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e318d7c.7fbed6630ca8-smtp-out-n01; Wed, 29 Jan 2020 13:49:48 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 56EB5C447A1; Wed, 29 Jan 2020 13:49:48 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: sibis) by smtp.codeaurora.org (Postfix) with ESMTPSA id 80EC3C43383; Wed, 29 Jan 2020 13:49:47 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Wed, 29 Jan 2020 19:19:47 +0530 From: Sibi Sankar To: Matthias Kaehlcke Cc: viresh.kumar@linaro.org, sboyd@kernel.org, georgi.djakov@linaro.org, saravanak@google.com, nm@ti.com, bjorn.andersson@linaro.org, agross@kernel.org, david.brown@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, rjw@rjwysocki.net, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, dianders@chromium.org, vincent.guittot@linaro.org, amit.kucheria@linaro.org, ulf.hansson@linaro.org Subject: Re: [RFC v3 04/10] OPP: Add and export helper to update voltage In-Reply-To: <20200128213336.GH46072@google.com> References: <20200127200350.24465-1-sibis@codeaurora.org> <20200127200350.24465-5-sibis@codeaurora.org> <20200128213336.GH46072@google.com> Message-ID: <634183c54f18b4500da6aa16e9cf4185@codeaurora.org> X-Sender: sibis@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 2020-01-29 03:03, Matthias Kaehlcke wrote: > Hi Sibi, > > On Tue, Jan 28, 2020 at 01:33:44AM +0530, Sibi Sankar wrote: >> Add and export 'dev_pm_opp_update_voltage' to find and update voltage >> of an opp for a given frequency. This will be useful to update the >> opps >> with voltages read back from firmware. >> >> Signed-off-by: Sibi Sankar >> --- >> drivers/opp/core.c | 55 >> ++++++++++++++++++++++++++++++++++++++++++ >> include/linux/pm_opp.h | 10 ++++++++ >> 2 files changed, 65 insertions(+) >> >> diff --git a/drivers/opp/core.c b/drivers/opp/core.c >> index 9aa2a44a5d638..f241e83ec926a 100644 >> --- a/drivers/opp/core.c >> +++ b/drivers/opp/core.c >> @@ -2503,6 +2503,61 @@ int dev_pm_opp_disable(struct device *dev, >> unsigned long freq) >> } >> EXPORT_SYMBOL_GPL(dev_pm_opp_disable); >> >> +/** >> + * dev_pm_opp_update_voltage() - Find and update voltage > > The comment should mention that this is done for an OPP. > > Maybe omit the 'find' part here and just say 'Update the voltage of > an OPP'? sure makes sense > >> + * @dev: device for which we do this operation >> + * @freq: OPP frequency to update voltage >> + * @u_volt: voltage requested for this opp >> + * >> + * Find and update voltage of a disabled opp corresponding to the >> given >> + * frequency. This is useful only for devices with single power >> supply. >> + * >> + * Return: 0 if modification was successful or a negative error >> value. >> + */ >> +int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq, >> + unsigned long u_volt) >> +{ >> + struct dev_pm_opp *opp = ERR_PTR(-ENODEV); > > initialization is not needed > >> + struct opp_table *opp_table; >> + unsigned long tol; >> + int ret = 0; >> + >> + /* Find the opp_table */ > > Drop the comment, it's obvious from the code. > >> + opp_table = _find_opp_table(dev); >> + if (IS_ERR(opp_table)) { >> + ret = PTR_ERR(opp_table); >> + dev_err(dev, "%s: OPP table not found (%d)\n", __func__, ret); >> + return PTR_ERR(opp_table); > > return ret; missed that :( > >> + } >> + >> + opp = dev_pm_opp_find_freq_exact(dev, freq, false); >> + if (IS_ERR(opp)) { >> + ret = PTR_ERR(opp); >> + goto put_table; >> + } >> + >> + mutex_lock(&opp_table->lock); >> + >> + /* update only if the opp is disabled */ >> + if (opp->available) { >> + ret = -EBUSY; >> + goto unlock; >> + } >> + >> + tol = u_volt * opp_table->voltage_tolerance_v1 / 100; >> + opp->supplies[0].u_volt_min = u_volt - tol; >> + opp->supplies[0].u_volt = u_volt; >> + opp->supplies[0].u_volt_min = u_volt + tol; > > .u_volt_max = > > I suppose the assignments need to be done for all possible supplies, > i.e. 0 to (opp_table->regulator_count - 1). a single value for all possible supplies seems wrong. Anyway will wait to see what Viresh thinks about it. -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.