From patchwork Mon Dec 6 16:10:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 12658851 X-Patchwork-Delegate: kvalo@adurom.com 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 0AAFEC433FE for ; Mon, 6 Dec 2021 16:15:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1386793AbhLFQTN (ORCPT ); Mon, 6 Dec 2021 11:19:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41244 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1382208AbhLFQSq (ORCPT ); Mon, 6 Dec 2021 11:18:46 -0500 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 8E2E1C08E844 for ; Mon, 6 Dec 2021 08:11:07 -0800 (PST) Received: by mail-pf1-x429.google.com with SMTP id n26so10603413pff.3 for ; Mon, 06 Dec 2021 08:11:07 -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:mime-version :content-transfer-encoding; bh=/dZMe5fXW3JmkstQUnuTxaguikQO8croA43e/A9yBnw=; b=wsxIo8iRiao/IrGDfq47xrllVJ4TjbrPMq5pi3ujnxN/VKCJ3gsfxKRCeoeCqPfYQu kOwY5U32UUnpRggGW8w10rv9Qb+gMMChBODZE8cet49sqH0aXLIuy3Hy/fNcF2I49xtW w/tPBkVH6OZ0gml4qbyNHA2LKoSRu2Duh75QZw7O02/WxlK7y7iu/eS+gRwq5vnZ0TMf 4NrQWs80FVlPsg+02Ay9mkBOTx6d4n9cp8+8F0Dpa7NfdGkA7BMrgrVXUDuNa+sp9Oa0 tBWh2Wm8WKIWHNKf1R7ackwqOJUltuACyxAA6XpX27PTUDAPkFN9K/s0tPCDvwcBdLVB v8Ww== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/dZMe5fXW3JmkstQUnuTxaguikQO8croA43e/A9yBnw=; b=ND8Qb7XzDXlHZWIEOAw7zNpPqxEID9SXjezmpR9g0OjypudOh0kp22CLPDZhMyg0jD vXDYXeb0+bc7ayF0meRWgon7OU+PbbJK1fkQ8NxIHl45o020MdtABd9pyHPatu4dsYFm 0KGpTpYoq+aleZT3ETHoY5Alf0tj0ElSEAHV8BwQkxHhzfoWMDXGueSTfZ5Iua0YdyZP eFDQoCwmr2WxGjO2vCMY3oVsrkugUTwL31P8dZlicchiWFfiZjxzUHFpaaq5WrcyqBhI pBO9UxlH7jgjQx2fKqDTQKQRq8sGiAzh5hOlvK3FpwR3jc3J0kjayiEx/ZzFIZX2ZxYR BVNg== X-Gm-Message-State: AOAM531K31B3vOknf8ouNaKOp2brZbUsYxs7n3UTXSjKu2oFZPB5Vukn xArnTGyhCDTJULn+46BWdYRY X-Google-Smtp-Source: ABdhPJzHztOd8XGPiN1RUx+EQUVKeXqRT/D1cHtxog5GiB7PeT8WgTwjvv+39GKJ//C4Nqx58PR66g== X-Received: by 2002:a05:6a00:1594:b0:4ae:dc6:f344 with SMTP id u20-20020a056a00159400b004ae0dc6f344mr7919655pfk.56.1638807066912; Mon, 06 Dec 2021 08:11:06 -0800 (PST) Received: from localhost.localdomain ([117.217.176.38]) by smtp.gmail.com with ESMTPSA id lr6sm11288968pjb.0.2021.12.06.08.11.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Dec 2021 08:11:06 -0800 (PST) From: Manivannan Sadhasivam To: mhi@lists.linux.dev Cc: hemantk@codeaurora.org, bbhatt@codeaurora.org, loic.poulain@linaro.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, ath11k@lists.infradead.org, linux-wireless@vger.kernel.org, kvalo@codeaurora.org, stable@vger.kernel.org, Pengyu Ma , Manivannan Sadhasivam Subject: [PATCH] bus: mhi: core: Add support for forced PM resume Date: Mon, 6 Dec 2021 21:40:59 +0530 Message-Id: <20211206161059.107007-1-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Loic Poulain For whatever reason, some devices like QCA6390, WCN6855 using ath11k are not in M3 state during PM resume, but still functional. The mhi_pm_resume should then not fail in those cases, and let the higher level device specific stack continue resuming process. Add a new parameter to mhi_pm_resume, to force resuming, whatever the current MHI state is. This fixes a regression with non functional ath11k WiFi after suspend/resume cycle on some machines. Bug report: https://bugzilla.kernel.org/show_bug.cgi?id=214179 Cc: stable@vger.kernel.org #5.13 Fixes: 020d3b26c07a ("bus: mhi: Early MHI resume failure in non M3 state") Reported-by: Kalle Valo Reported-by: Pengyu Ma Signed-off-by: Loic Poulain [mani: Added comment, bug report, added reported-by tags and CCed stable] Signed-off-by: Manivannan Sadhasivam Tested-by: Kalle Valo Acked-by: Kalle Valo --- drivers/bus/mhi/core/pm.c | 10 +++++++--- drivers/bus/mhi/pci_generic.c | 2 +- drivers/net/wireless/ath/ath11k/mhi.c | 6 +++++- include/linux/mhi.h | 3 ++- 4 files changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 7464f5d09973..4ddd266e042e 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -881,7 +881,7 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl) } EXPORT_SYMBOL_GPL(mhi_pm_suspend); -int mhi_pm_resume(struct mhi_controller *mhi_cntrl) +int mhi_pm_resume(struct mhi_controller *mhi_cntrl, bool force) { struct mhi_chan *itr, *tmp; struct device *dev = &mhi_cntrl->mhi_dev->dev; @@ -898,8 +898,12 @@ int mhi_pm_resume(struct mhi_controller *mhi_cntrl) if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) return -EIO; - if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3) - return -EINVAL; + if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3) { + dev_warn(dev, "Resuming from non M3 state (%s)\n", + TO_MHI_STATE_STR(mhi_get_mhi_state(mhi_cntrl))); + if (!force) + return -EINVAL; + } /* Notify clients about exiting LPM */ list_for_each_entry_safe(itr, tmp, &mhi_cntrl->lpm_chans, node) { diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c index 9ef41354237c..efd1da66fdf9 100644 --- a/drivers/bus/mhi/pci_generic.c +++ b/drivers/bus/mhi/pci_generic.c @@ -959,7 +959,7 @@ static int __maybe_unused mhi_pci_runtime_resume(struct device *dev) return 0; /* Nothing to do at MHI level */ /* Exit M3, transition to M0 state */ - err = mhi_pm_resume(mhi_cntrl); + err = mhi_pm_resume(mhi_cntrl, false); if (err) { dev_err(&pdev->dev, "failed to resume device: %d\n", err); goto err_recovery; diff --git a/drivers/net/wireless/ath/ath11k/mhi.c b/drivers/net/wireless/ath/ath11k/mhi.c index 26c7ae242db6..f1f2fa2d690d 100644 --- a/drivers/net/wireless/ath/ath11k/mhi.c +++ b/drivers/net/wireless/ath/ath11k/mhi.c @@ -533,7 +533,11 @@ static int ath11k_mhi_set_state(struct ath11k_pci *ab_pci, ret = mhi_pm_suspend(ab_pci->mhi_ctrl); break; case ATH11K_MHI_RESUME: - ret = mhi_pm_resume(ab_pci->mhi_ctrl); + /* Do force MHI resume as some devices like QCA6390, WCN6855 + * are not in M3 state but they are functional. So just ignore + * the MHI state while resuming. + */ + ret = mhi_pm_resume(ab_pci->mhi_ctrl, true); break; case ATH11K_MHI_TRIGGER_RDDM: ret = mhi_force_rddm_mode(ab_pci->mhi_ctrl); diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 723985879035..102303288cee 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -660,8 +660,9 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl); /** * mhi_pm_resume - Resume MHI from suspended state * @mhi_cntrl: MHI controller + * @force: Force resuming to M0 irrespective of the device MHI state */ -int mhi_pm_resume(struct mhi_controller *mhi_cntrl); +int mhi_pm_resume(struct mhi_controller *mhi_cntrl, bool force); /** * mhi_download_rddm_image - Download ramdump image from device for