From patchwork Wed Jul 20 04:34:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Kepplinger X-Patchwork-Id: 12923496 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F434C43334 for ; Wed, 20 Jul 2022 04:36:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236175AbiGTEgT (ORCPT ); Wed, 20 Jul 2022 00:36:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44766 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236335AbiGTEgS (ORCPT ); Wed, 20 Jul 2022 00:36:18 -0400 Received: from comms.puri.sm (comms.puri.sm [159.203.221.185]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1FB0A371AB; Tue, 19 Jul 2022 21:36:15 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id F3A0DDFF57; Tue, 19 Jul 2022 21:35:44 -0700 (PDT) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6iBEMZdunAGx; Tue, 19 Jul 2022 21:35:44 -0700 (PDT) From: Martin Kepplinger DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=puri.sm; s=comms; t=1658291744; bh=jqOo37x4uFbD+zkK8dBPu6T7uX27EbIdMfsNQPA9bLo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qX1yNPqQDzcEUzERq3Wbck6SydsQbv6QmMltZMU/2Oogf39Y/lSfwDju+PtmyUNFu 2S/STXvXerifxRXcZ9AaIkli5IXcWmFRD25v493SMR4FxN4FRND/711mgVJhClrM9k fYdsV1NR6uVrCqCWxP2oXdYuN0HCy190UusrrdST2btMeCD37mOCVoBMmVqa3N6vNs g+fMEPrYwsY3I1sOz+7TqidEEcYL1JbqNbl5vtE95LfahpFpXU/KfV/UkB3Tzazik2 zYl04VyPI1uGUqjfB2T5gh43Jb1zvZtrYWzZRxxEFnOghCSA5JpSWVwPItR4+TyrRO YnO0mmZqHMayg== To: rafael@kernel.org, khilman@kernel.org, ulf.hansson@linaro.org, robh@kernel.org, krzysztof.kozlowski@linaro.org, shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com, pavel@ucw.cz Cc: kernel@puri.sm, linux-imx@nxp.com, broonie@kernel.org, l.stach@pengutronix.de, aford173@gmail.com, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Martin Kepplinger Subject: [PATCH v4 2/3] power: domain: handle genpd correctly when needing interrupts Date: Wed, 20 Jul 2022 06:34:43 +0200 Message-Id: <20220720043444.1289952-3-martin.kepplinger@puri.sm> In-Reply-To: <20220720043444.1289952-1-martin.kepplinger@puri.sm> References: <20220720043444.1289952-1-martin.kepplinger@puri.sm> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org If for example the power-domains' power-supply node (regulator) needs interrupts to work, the current setup with noirq callbacks cannot work; for example a pmic regulator on i2c, when suspending, usually already times out during suspend_noirq: [ 41.024193] buck4: failed to disable: -ETIMEDOUT So fix system suspend and resume for these power-domains by using the "outer" suspend/resume callbacks instead. Tested on the imx8mq-librem5 board, but by looking at the dts, this will fix imx8mq-evk and possibly many other boards too. This is designed so that genpd providers just say "this genpd needs interrupts" (by setting the flag) - without implying an implementation. Initially system suspend problems had been discussed at https://lore.kernel.org/linux-arm-kernel/20211002005954.1367653-8-l.stach@pengutronix.de/ which led to discussing the pmic that contains the regulators which serve as power-domain power-supplies: https://lore.kernel.org/linux-pm/573166b75e524517782471c2b7f96e03fd93d175.camel@puri.sm/T/ Signed-off-by: Martin Kepplinger --- drivers/base/power/domain.c | 13 +++++++++++++ include/linux/pm_domain.h | 5 +++++ 2 files changed, 18 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 739e52cd4aba..76ea39e960f3 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -130,6 +130,7 @@ static const struct genpd_lock_ops genpd_spin_ops = { #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) #define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) #define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) +#define genpd_irq_on(genpd) (genpd->flags & GENPD_FLAG_IRQ_ON) static inline bool irq_safe_dev_in_sleep_domain(struct device *dev, const struct generic_pm_domain *genpd) @@ -2076,6 +2077,13 @@ int pm_genpd_init(struct generic_pm_domain *genpd, genpd->dev_ops.start = pm_clk_resume; } + if (genpd_irq_on(genpd)) { + genpd->domain.ops.suspend = genpd_suspend_noirq; + genpd->domain.ops.resume = genpd_resume_noirq; + genpd->domain.ops.suspend_noirq = NULL; + genpd->domain.ops.resume_noirq = NULL; + } + /* The always-on governor works better with the corresponding flag. */ if (gov == &pm_domain_always_on_gov) genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON; @@ -2766,6 +2774,11 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, goto err; dev_gpd_data(dev)->default_pstate = pstate; } + + if (pd->domain.ops.suspend_noirq && (pd->flags & GENPD_FLAG_IRQ_ON)) + dev_err(dev, "PM domain %s needs irqs but uses noirq suspend\n", + pd->name); + return 1; err: diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 76bc9e3ef5ff..03bb86e43550 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -61,6 +61,10 @@ * GENPD_FLAG_MIN_RESIDENCY: Enable the genpd governor to consider its * components' next wakeup when determining the * optimal idle state. + * + * GENPD_FLAG_IRQ_ON: genpd needs irqs to be able to manage power + * on/off. Use the outer suspend/resume callbacks + * instead of noirq for example. */ #define GENPD_FLAG_PM_CLK BIT(0) #define GENPD_FLAG_IRQ_SAFE BIT(1) @@ -69,6 +73,7 @@ #define GENPD_FLAG_CPU_DOMAIN BIT(4) #define GENPD_FLAG_RPM_ALWAYS_ON BIT(5) #define GENPD_FLAG_MIN_RESIDENCY BIT(6) +#define GENPD_FLAG_IRQ_ON BIT(7) enum gpd_status { GENPD_STATE_ON = 0, /* PM domain is on */