From patchwork Sun Oct 16 09:58:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 13007754 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 E6B77C4332F for ; Sun, 16 Oct 2022 09:58:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229721AbiJPJ6n (ORCPT ); Sun, 16 Oct 2022 05:58:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52600 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229719AbiJPJ6k (ORCPT ); Sun, 16 Oct 2022 05:58:40 -0400 Received: from mail-pg1-x52c.google.com (mail-pg1-x52c.google.com [IPv6:2607:f8b0:4864:20::52c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70C523640C for ; Sun, 16 Oct 2022 02:58:37 -0700 (PDT) Received: by mail-pg1-x52c.google.com with SMTP id h185so8082434pgc.10 for ; Sun, 16 Oct 2022 02:58:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=uIHYWY56QD8kdVR8UkvvdHp3cIEPSeTOMo7K4e0+8vI=; b=ZxddD8Za0wZsUUJ6Nk5mbI13E2BDhHfxNKYxve4XGPZY25S3f5dartelW6ig1AJ0TE urk9Jfrnxh9RzIRoYYOZ9fA6PU+cBmvY4TBahjbDqVUs9hCjgnEyQuVHAvD4dRN7zqVl khbXWIUjHw2GsM8BuJw1b0yQd4dsWKKVTjPhdZ6SGP9wVHwdwjiFAm9UQoff/CU0ma9D adwcI+adygygmXnksMbFYHxWu9jtYVhJJ9INfrsK8lWYTu3rLP17Hqzpv9WXQnsL3rZ5 zfrhFKvaUExS+xQk8tdSPECGcIm+cRqDKTSa4bVdQcEMHZk6B5Mv04Z84z0FGILHixFf nB6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=uIHYWY56QD8kdVR8UkvvdHp3cIEPSeTOMo7K4e0+8vI=; b=KZmC1OS5FVMf9MoOK7PNVMApz6tPQbWUVAMeoVOlWE5dM6c4xVAvLNzjdaiPORW37Q Zlt3Gd7hns2c1I5OTtdkQ8HtudBgasOhe9mNOYoQEF6aOBJOiFwXj5ZYEkVuu7SgapHY N1AeAJo63MVF7lWw9AQ+zS/tpMmZy3ylDAVfREeZRksVzeAzO+7z6T5ebtnBCPpPs07y TRpyCYyyPt9JoQ7Zv7dlb9AzkuWl1sTSigBvwSLrJTsQ8CxybR+c0nWQIVLb2Nru0Rgy LEplXDbvNs6j1jhLLcCU+z+uM/eJpkp8jHgFBf9OGOKg5cG7oQLC6Xqssy4xNEBnuPep wULg== X-Gm-Message-State: ACrzQf3S37CFe54yiQML5qLay6x2AyuR9vSeJVGjihOIMNEVcQ0hQcQU xD8V88GaELquKBQeLrQo5PsMZA== X-Google-Smtp-Source: AMsMyM5PWhYCkM8N97Vm12Rtc/car+lxsxKzJ+85li/IR9jXxtbolLnQOKcPSUoj/WalqghFKHR9Hw== X-Received: by 2002:a05:6a00:1341:b0:566:5e54:8110 with SMTP id k1-20020a056a00134100b005665e548110mr6842504pfu.6.1665914316527; Sun, 16 Oct 2022 02:58:36 -0700 (PDT) Received: from localhost.localdomain (80.251.214.228.16clouds.com. [80.251.214.228]) by smtp.gmail.com with ESMTPSA id c18-20020a170902d49200b001745662d568sm4481838plg.278.2022.10.16.02.58.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Oct 2022 02:58:35 -0700 (PDT) From: Shawn Guo To: "Rafael J . Wysocki" Cc: Kevin Hilman , Ulf Hansson , Len Brown , Pavel Machek , Greg Kroah-Hartman , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Shawn Guo Subject: [PATCH 1/3] PM: domains: Pass generic PM noirq hooks to genpd_finish_suspend() Date: Sun, 16 Oct 2022 17:58:13 +0800 Message-Id: <20221016095815.2550034-2-shawn.guo@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221016095815.2550034-1-shawn.guo@linaro.org> References: <20221016095815.2550034-1-shawn.guo@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org While argument `poweroff` works fine for genpd_finish_suspend() to handle distinction between suspend and poweroff, it won't scale if we want to use it for freeze as well. Pass generic PM noirq hooks as arguments instead, so that the function can possibly cover freeze case too. Signed-off-by: Shawn Guo --- drivers/base/power/domain.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 55a10e6d4e2a..01f5644938e0 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1189,12 +1189,15 @@ static int genpd_prepare(struct device *dev) * genpd_finish_suspend - Completion of suspend or hibernation of device in an * I/O pm domain. * @dev: Device to suspend. - * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. + * @suspend_noirq: Generic suspend_noirq callback. + * @resume_noirq: Generic resume_noirq callback. * * Stop the device and remove power from the domain if all devices in it have * been stopped. */ -static int genpd_finish_suspend(struct device *dev, bool poweroff) +static int genpd_finish_suspend(struct device *dev, + int (*suspend_noirq)(struct device *dev), + int (*resume_noirq)(struct device *dev)) { struct generic_pm_domain *genpd; int ret = 0; @@ -1203,10 +1206,7 @@ static int genpd_finish_suspend(struct device *dev, bool poweroff) if (IS_ERR(genpd)) return -EINVAL; - if (poweroff) - ret = pm_generic_poweroff_noirq(dev); - else - ret = pm_generic_suspend_noirq(dev); + ret = suspend_noirq(dev); if (ret) return ret; @@ -1217,10 +1217,7 @@ static int genpd_finish_suspend(struct device *dev, bool poweroff) !pm_runtime_status_suspended(dev)) { ret = genpd_stop_dev(genpd, dev); if (ret) { - if (poweroff) - pm_generic_restore_noirq(dev); - else - pm_generic_resume_noirq(dev); + resume_noirq(dev); return ret; } } @@ -1244,7 +1241,9 @@ static int genpd_suspend_noirq(struct device *dev) { dev_dbg(dev, "%s()\n", __func__); - return genpd_finish_suspend(dev, false); + return genpd_finish_suspend(dev, + pm_generic_suspend_noirq, + pm_generic_resume_noirq); } /** @@ -1353,7 +1352,9 @@ static int genpd_poweroff_noirq(struct device *dev) { dev_dbg(dev, "%s()\n", __func__); - return genpd_finish_suspend(dev, true); + return genpd_finish_suspend(dev, + pm_generic_poweroff_noirq, + pm_generic_restore_noirq); } /** From patchwork Sun Oct 16 09:58:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 13007755 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 0C7C4C43219 for ; Sun, 16 Oct 2022 09:58:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229734AbiJPJ6p (ORCPT ); Sun, 16 Oct 2022 05:58:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52660 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229696AbiJPJ6m (ORCPT ); Sun, 16 Oct 2022 05:58:42 -0400 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84CCA3DBE0 for ; Sun, 16 Oct 2022 02:58:40 -0700 (PDT) Received: by mail-pj1-x1031.google.com with SMTP id l1-20020a17090a72c100b0020a6949a66aso8549001pjk.1 for ; 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[80.251.214.228]) by smtp.gmail.com with ESMTPSA id c18-20020a170902d49200b001745662d568sm4481838plg.278.2022.10.16.02.58.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Oct 2022 02:58:39 -0700 (PDT) From: Shawn Guo To: "Rafael J . Wysocki" Cc: Kevin Hilman , Ulf Hansson , Len Brown , Pavel Machek , Greg Kroah-Hartman , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Shawn Guo Subject: [PATCH 2/3] PM: domains: Consolidate genpd_restore_noirq() and genpd_resume_noirq() Date: Sun, 16 Oct 2022 17:58:14 +0800 Message-Id: <20221016095815.2550034-3-shawn.guo@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221016095815.2550034-1-shawn.guo@linaro.org> References: <20221016095815.2550034-1-shawn.guo@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Most of the logic between genpd_restore_noirq() and genpd_resume_noirq() are same except GENPD_STATE_OFF status reset for hibernation restore. The suspended_count decrement for restore should be the right thing to do anyway, considering there is an increment in genpd_finish_suspend() for hibernation. Consolidate genpd_restore_noirq() and genpd_resume_noirq() into genpd_finish_resume() and handle GENPD_STATE_OFF status reset for restore case specially. Signed-off-by: Shawn Guo --- drivers/base/power/domain.c | 70 ++++++++++++++++++------------------- 1 file changed, 35 insertions(+), 35 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 01f5644938e0..fc0ac9e6050e 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1247,12 +1247,14 @@ static int genpd_suspend_noirq(struct device *dev) } /** - * genpd_resume_noirq - Start of resume of device in an I/O PM domain. + * genpd_resume_noirq - Completion of resume of device in an I/O PM domain. * @dev: Device to resume. + * @resume_noirq: Generic resume_noirq callback. * * Restore power to the device's PM domain, if necessary, and start the device. */ -static int genpd_resume_noirq(struct device *dev) +static int genpd_finish_resume(struct device *dev, + int (*resume_noirq)(struct device *dev)) { struct generic_pm_domain *genpd; int ret; @@ -1264,9 +1266,25 @@ static int genpd_resume_noirq(struct device *dev) return -EINVAL; if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) - return pm_generic_resume_noirq(dev); + return resume_noirq(dev); genpd_lock(genpd); + + /* + * Special handling for hibernation restore: + * At this point suspended_count == 0 means we are being run for the + * first time for the given domain in the present cycle. + */ + if (resume_noirq == pm_generic_restore_noirq && + genpd->suspended_count++ == 0) { + /* + * The boot kernel might put the domain into arbitrary state, + * so make it appear as powered off to genpd_sync_power_on(), + * so that it tries to power it on in case it was really off. + */ + genpd->status = GENPD_STATE_OFF; + } + genpd_sync_power_on(genpd, true, 0); genpd->suspended_count--; genpd_unlock(genpd); @@ -1281,6 +1299,19 @@ static int genpd_resume_noirq(struct device *dev) return pm_generic_resume_noirq(dev); } +/** + * genpd_resume_noirq - Start of resume of device in an I/O PM domain. + * @dev: Device to resume. + * + * Restore power to the device's PM domain, if necessary, and start the device. + */ +static int genpd_resume_noirq(struct device *dev) +{ + dev_dbg(dev, "%s()\n", __func__); + + return genpd_finish_resume(dev, pm_generic_resume_noirq); +} + /** * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. * @dev: Device to freeze. @@ -1366,40 +1397,9 @@ static int genpd_poweroff_noirq(struct device *dev) */ static int genpd_restore_noirq(struct device *dev) { - struct generic_pm_domain *genpd; - int ret = 0; - dev_dbg(dev, "%s()\n", __func__); - genpd = dev_to_genpd(dev); - if (IS_ERR(genpd)) - return -EINVAL; - - /* - * At this point suspended_count == 0 means we are being run for the - * first time for the given domain in the present cycle. - */ - genpd_lock(genpd); - if (genpd->suspended_count++ == 0) { - /* - * The boot kernel might put the domain into arbitrary state, - * so make it appear as powered off to genpd_sync_power_on(), - * so that it tries to power it on in case it was really off. - */ - genpd->status = GENPD_STATE_OFF; - } - - genpd_sync_power_on(genpd, true, 0); - genpd_unlock(genpd); - - if (genpd->dev_ops.stop && genpd->dev_ops.start && - !pm_runtime_status_suspended(dev)) { - ret = genpd_start_dev(genpd, dev); - if (ret) - return ret; - } - - return pm_generic_restore_noirq(dev); + return genpd_finish_resume(dev, pm_generic_restore_noirq); } /** From patchwork Sun Oct 16 09:58:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 13007756 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 F3319C4332F for ; Sun, 16 Oct 2022 09:58:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229716AbiJPJ6x (ORCPT ); Sun, 16 Oct 2022 05:58:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52700 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229673AbiJPJ6p (ORCPT ); Sun, 16 Oct 2022 05:58:45 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59D9932D92 for ; 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[80.251.214.228]) by smtp.gmail.com with ESMTPSA id c18-20020a170902d49200b001745662d568sm4481838plg.278.2022.10.16.02.58.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Oct 2022 02:58:42 -0700 (PDT) From: Shawn Guo To: "Rafael J . Wysocki" Cc: Kevin Hilman , Ulf Hansson , Len Brown , Pavel Machek , Greg Kroah-Hartman , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Shawn Guo Subject: [PATCH 3/3] PM: domains: Power off[on] domain in hibernate .freeze[thaw]_noirq hook Date: Sun, 16 Oct 2022 17:58:15 +0800 Message-Id: <20221016095815.2550034-4-shawn.guo@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221016095815.2550034-1-shawn.guo@linaro.org> References: <20221016095815.2550034-1-shawn.guo@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On platforms which use SHUTDOWN as hibernation mode, the genpd noirq hooks will be called like below. genpd_freeze_noirq() genpd_restore_noirq() ↓ ↑ Create snapshot image Restore system ↓ ↑ genpd_thaw_noirq() Read snapshot image ↓ ↑ Write snapshot image Kernel boot ↓ ↑ power_down() Power on device As of today suspend hooks genpd_suspend[resume]_noirq() manages domain on/off state, but hibernate hooks genpd_freeze[thaw]_noirq() doesn't. This results in a different behavior of domain power state between suspend and hibernate freeze, i.e. domain is powered off for the former while on for the later. It causes a problem on platforms like i.MX where the domain needs to be powered on/off by calling clock and regulator interface. When the platform restores from hibernation, the domain is off in hardware and genpd_restore_noirq() tries to power it on, but will never succeed because software state of domain (clock and regulator) is left on from the last hibernate freeze, so kernel thinks that clock and regulator are enabled while they are actually not turned on in hardware. The consequence would be that devices in the power domain will access registers without clock or power, and cause hardware lockup. Power off[on] domain in hibernate .freeze[thaw]_noirq hook for reasons: - Align the behavior between suspend and hibernate freeze. - Have power state of domains stay in sync between hardware and software for hibernate freeze, and thus fix the lockup issue seen on i.MX power platform. Signed-off-by: Shawn Guo --- drivers/base/power/domain.c | 35 ++++------------------------------- 1 file changed, 4 insertions(+), 31 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index fc0ac9e6050e..2497a43737e0 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1323,24 +1323,11 @@ static int genpd_resume_noirq(struct device *dev) */ static int genpd_freeze_noirq(struct device *dev) { - const struct generic_pm_domain *genpd; - int ret = 0; - dev_dbg(dev, "%s()\n", __func__); - genpd = dev_to_genpd(dev); - if (IS_ERR(genpd)) - return -EINVAL; - - ret = pm_generic_freeze_noirq(dev); - if (ret) - return ret; - - if (genpd->dev_ops.stop && genpd->dev_ops.start && - !pm_runtime_status_suspended(dev)) - ret = genpd_stop_dev(genpd, dev); - - return ret; + return genpd_finish_suspend(dev, + pm_generic_freeze_noirq, + pm_generic_thaw_noirq); } /** @@ -1352,23 +1339,9 @@ static int genpd_freeze_noirq(struct device *dev) */ static int genpd_thaw_noirq(struct device *dev) { - const struct generic_pm_domain *genpd; - int ret = 0; - dev_dbg(dev, "%s()\n", __func__); - genpd = dev_to_genpd(dev); - if (IS_ERR(genpd)) - return -EINVAL; - - if (genpd->dev_ops.stop && genpd->dev_ops.start && - !pm_runtime_status_suspended(dev)) { - ret = genpd_start_dev(genpd, dev); - if (ret) - return ret; - } - - return pm_generic_thaw_noirq(dev); + return genpd_finish_resume(dev, pm_generic_thaw_noirq); } /**