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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 29754C2BB48 for ; Mon, 14 Dec 2020 14:19:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE8C222BEF for ; Mon, 14 Dec 2020 14:19:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731900AbgLNOT4 (ORCPT ); Mon, 14 Dec 2020 09:19:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43494 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2440025AbgLNOTy (ORCPT ); Mon, 14 Dec 2020 09:19:54 -0500 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4E88BC0617A6 for ; Mon, 14 Dec 2020 06:18:36 -0800 (PST) Received: by mail-wr1-x443.google.com with SMTP id a12so16568142wrv.8 for ; Mon, 14 Dec 2020 06:18:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=SQkFVpz5akWmuWPyyDeP6Bwq5eCvtJqCABU8uWkUUW8=; b=KfPVnnKMiGDLSeA2ZexpxK+77+GkQkkrc/Uxi0TSjcPyR6XKdZzepvIzOFG790bqBu h94CS6tyk0POrq9V8JZSIej6ybMO/itccr7pG30NoTFUCnaNT2sJpI2yni5MqFJDcRlO h8OIykV6iWGc7pvLSM8Ig188cCAbhlPRhQPYNHs8/mQrNbG3m8Aid9c8ZeAlnZLenzjZ mdiULvQbePf5Y4tGjwdR2Yjp6+hfudglByYktSUb1WCKS3Uf5DUgsOTwhrmVc0LXjs0i udBaqMl5MMeI+cU0QqGgVVZLriZsq70BFUYqTsZdrz4fyyjD0Fvw8zWL6ek5a2cVFbIS 8Pqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=SQkFVpz5akWmuWPyyDeP6Bwq5eCvtJqCABU8uWkUUW8=; b=t2Q7H0qvgJSpkbEBQJ2C+AFszUGMHVti2xrhnhK9NKdVYfJD1rBp0WIyo6ZUF6A1m6 mz2Kl/Rm86RLqFv8h8GQUBFUcmKw+D1VuMXomSeCyor/kCJptd3/CpAzNPWH5++y8a1U wvTjCJuZdykAXsjfdxsJXHaXK8Rd7rW/2yVf+OaJatWntYrGKZFlGFyl2X6PNPtD2wky lNeC6B9b35kQYB1C3GYiHZEcKVdMAmQxCZzTOfKHiCJk3XFAMcDyk2Wsr3xHRDpC3Rjh jL80kZS/bAvzv7FCNXlrq9lWB2EAByza7EIt3Ch9q3Jo5YGSmc7aSZPxwSvFJi1jfkaS 70bg== X-Gm-Message-State: AOAM5306zeO+cE6EU0I2T7VHXNEAsou7JtQoH8g3v3347NOua0FEDHE/ aTkFqWTYke2UOkjhIBOHl0BudA== X-Google-Smtp-Source: ABdhPJzLq7KS+Q7/f+FszicpY2GsBo6iRU2AAQ86z7sXApWF5xEkwwGGykTGUkpzoMR5zhy3znZK/w== X-Received: by 2002:adf:bc92:: with SMTP id g18mr28636372wrh.160.1607955515017; Mon, 14 Dec 2020 06:18:35 -0800 (PST) Received: from localhost.localdomain ([2a01:e0a:490:8730:f2e4:25b3:2b53:52cd]) by smtp.gmail.com with ESMTPSA id h5sm34126285wrp.56.2020.12.14.06.18.34 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 Dec 2020 06:18:34 -0800 (PST) From: Loic Poulain To: manivannan.sadhasivam@linaro.org, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, bbhatt@codeaurora.org, Loic Poulain Subject: [PATCH v5 06/10] mhi: pci_generic: Add suspend/resume/recovery procedure Date: Mon, 14 Dec 2020 15:25:33 +0100 Message-Id: <1607955937-26951-7-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1607955937-26951-1-git-send-email-loic.poulain@linaro.org> References: <1607955937-26951-1-git-send-email-loic.poulain@linaro.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add support for system wide suspend/resume. During suspend, MHI device controller must be put in M3 state and PCI bus in D3 state. Add a recovery procedure allowing to reinitialize the device in case of error during resume steps, which can happen if device loses power (and so its context) while system suspend. Signed-off-by: Loic Poulain Reviewed-by Hemant Kumar --- drivers/bus/mhi/pci_generic.c | 102 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c index 2521cd4..0936701 100644 --- a/drivers/bus/mhi/pci_generic.c +++ b/drivers/bus/mhi/pci_generic.c @@ -13,6 +13,7 @@ #include #include #include +#include #define MHI_PCI_DEFAULT_BAR_NUM 0 @@ -186,6 +187,7 @@ enum mhi_pci_device_status { struct mhi_pci_device { struct mhi_controller mhi_cntrl; struct pci_saved_state *pci_state; + struct work_struct recovery_work; unsigned long status; }; @@ -313,6 +315,48 @@ static void mhi_pci_runtime_put(struct mhi_controller *mhi_cntrl) /* no PM for now */ } +static void mhi_pci_recovery_work(struct work_struct *work) +{ + struct mhi_pci_device *mhi_pdev = container_of(work, struct mhi_pci_device, + recovery_work); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev); + int err; + + dev_warn(&pdev->dev, "device recovery started\n"); + + /* Clean up MHI state */ + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { + mhi_power_down(mhi_cntrl, false); + mhi_unprepare_after_power_down(mhi_cntrl); + } + + /* Check if we can recover without full reset */ + pci_set_power_state(pdev, PCI_D0); + pci_load_saved_state(pdev, mhi_pdev->pci_state); + pci_restore_state(pdev); + + if (!mhi_pci_is_alive(mhi_cntrl)) + goto err_try_reset; + + err = mhi_prepare_for_power_up(mhi_cntrl); + if (err) + goto err_try_reset; + + err = mhi_sync_power_up(mhi_cntrl); + if (err) + goto err_unprepare; + + set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status); + return; + +err_unprepare: + mhi_unprepare_after_power_down(mhi_cntrl); +err_try_reset: + if (pci_reset_function(pdev)) + dev_err(&pdev->dev, "Recovery failed\n"); +} + static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { const struct mhi_pci_dev_info *info = (struct mhi_pci_dev_info *) id->driver_data; @@ -327,6 +371,8 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (!mhi_pdev) return -ENOMEM; + INIT_WORK(&mhi_pdev->recovery_work, mhi_pci_recovery_work); + mhi_cntrl_config = info->config; mhi_cntrl = &mhi_pdev->mhi_cntrl; @@ -391,6 +437,8 @@ static void mhi_pci_remove(struct pci_dev *pdev) struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev); struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + cancel_work_sync(&mhi_pdev->recovery_work); + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { mhi_power_down(mhi_cntrl, true); mhi_unprepare_after_power_down(mhi_cntrl); @@ -456,12 +504,66 @@ static const struct pci_error_handlers mhi_pci_err_handler = { .reset_done = mhi_pci_reset_done, }; +static int __maybe_unused mhi_pci_suspend(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + + cancel_work_sync(&mhi_pdev->recovery_work); + + /* Transition to M3 state */ + mhi_pm_suspend(mhi_cntrl); + + pci_save_state(pdev); + pci_disable_device(pdev); + pci_wake_from_d3(pdev, true); + pci_set_power_state(pdev, PCI_D3hot); + + return 0; +} + +static int __maybe_unused mhi_pci_resume(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + int err; + + pci_set_power_state(pdev, PCI_D0); + pci_restore_state(pdev); + pci_set_master(pdev); + + err = pci_enable_device(pdev); + if (err) + goto err_recovery; + + /* Exit M3, transition to M0 state */ + err = mhi_pm_resume(mhi_cntrl); + if (err) { + dev_err(&pdev->dev, "failed to resume device: %d\n", err); + goto err_recovery; + } + + return 0; + +err_recovery: + /* The device may have loose power or crashed, try recovering it */ + queue_work(system_long_wq, &mhi_pdev->recovery_work); + return 0; +} + +static const struct dev_pm_ops mhi_pci_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(mhi_pci_suspend, mhi_pci_resume) +}; + static struct pci_driver mhi_pci_driver = { .name = "mhi-pci-generic", .id_table = mhi_pci_id_table, .probe = mhi_pci_probe, .remove = mhi_pci_remove, .err_handler = &mhi_pci_err_handler, + .driver.pm = &mhi_pci_pm_ops }; module_pci_driver(mhi_pci_driver); -- 2.7.4