From patchwork Fri Nov 10 10:21:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kalle Valo X-Patchwork-Id: 13452678 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 31969C04A95 for ; Fri, 10 Nov 2023 18:27:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345083AbjKJS1J (ORCPT ); Fri, 10 Nov 2023 13:27:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345952AbjKJSZx (ORCPT ); Fri, 10 Nov 2023 13:25:53 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7FA528132 for ; Fri, 10 Nov 2023 02:22:06 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6454C433C8; Fri, 10 Nov 2023 10:22:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699611726; bh=4R+48ZsZ6g6W/iclu+AoYZ4jUcByaUxPgac3A4UoqZw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I1b4xoASLNZkFLnpBRCNyVvsw5GtJYDvTd+94wQ6wapIFnNbGlrgfGK2jjRZNMDpu U+SksjmptPpASrcgwX9qsvuxVGT4HEl5VSeYoyPWipoMC8cobwLLd4rdTimPy84Kdq TFkUZpe25gGt9FFnl0dZ+jJDH9bQj7tphgiNiaTo3vyGn5YF4PQ2P099jrrAOZNZxb Zk6lstxtwf6RMoRwQICt2ZJsn7laCiBdnoAY7xCLJexHvkDKdFBEsqIylwKN2rBp+s 6hUxGjiTDztIC1HAZ/eKfXyFeYmgD39nKwWS7QVoJxN2WqLJbIzoQUgIw9s7lGkOO1 Vf+GDjXsapZDg== From: Kalle Valo To: mhi@lists.linux.dev Cc: ath11k@lists.infradead.org, linux-wireless@vger.kernel.org Subject: [PATCH RFC 1/8] bus: mhi: host: add mhi_power_down_no_destroy() Date: Fri, 10 Nov 2023 12:21:55 +0200 Message-Id: <20231110102202.3168243-2-kvalo@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231110102202.3168243-1-kvalo@kernel.org> References: <20231110102202.3168243-1-kvalo@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Baochen Qiang If ath11k tries to call mhi_power_up() during resume it fails: ath11k_pci 0000:06:00.0: timeout while waiting for restart complete This happens because when calling mhi_power_up() the MHI subsystem eventually calls device_add() from mhi_create_devices() but the device creation is deferred: mhi mhi0_IPCR: Driver qcom_mhi_qrtr force probe deferral The reason for deferring device creation is explained in dpm_prepare(): /* * It is unsafe if probing of devices will happen during suspend or * hibernation and system behavior will be unpredictable in this case. * So, let's prohibit device's probing here and defer their probes * instead. The normal behavior will be restored in dpm_complete(). */ Because the device probe is deferred, the qcom_mhi_qrtr_probe() is not called and qcom_mhi_qrtr_dl_callback() fails silently as qdev is zero: static void qcom_mhi_qrtr_dl_callback(struct mhi_device *mhi_dev, struct mhi_result *mhi_res) { struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev); int rc; if (!qdev || mhi_res->transaction_status) return; So what this means that QRTR is not delivering messages and the QMI connection is not working between ath11k and the firmware, resulting a failure in firmware initialisation. To fix this add new function mhi_power_down_no_destroy() which does not destroy the devices during power down. This way mhi_power_up() can be called during resume and we can get ath11k hibernation working with the following patches. Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30 Signed-off-by: Baochen Qiang Signed-off-by: Kalle Valo --- drivers/bus/mhi/host/internal.h | 1 + drivers/bus/mhi/host/pm.c | 26 +++++++++++++++++++------- include/linux/mhi.h | 29 +++++++++++++++++++++++++++-- 3 files changed, 47 insertions(+), 9 deletions(-) diff --git a/drivers/bus/mhi/host/internal.h b/drivers/bus/mhi/host/internal.h index 2e139e76de4c..d1033af285e2 100644 --- a/drivers/bus/mhi/host/internal.h +++ b/drivers/bus/mhi/host/internal.h @@ -69,6 +69,7 @@ enum dev_st_transition { DEV_ST_TRANSITION_FP, DEV_ST_TRANSITION_SYS_ERR, DEV_ST_TRANSITION_DISABLE, + DEV_ST_TRANSITION_DISABLE_DESTROY_DEVICE, DEV_ST_TRANSITION_MAX, }; diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c index 8a4362d75fc4..e0e429adbda6 100644 --- a/drivers/bus/mhi/host/pm.c +++ b/drivers/bus/mhi/host/pm.c @@ -453,7 +453,8 @@ static int mhi_pm_mission_mode_transition(struct mhi_controller *mhi_cntrl) } /* Handle shutdown transitions */ -static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) +static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl, + bool destroy_device) { enum mhi_pm_state cur_state; struct mhi_event *mhi_event; @@ -515,8 +516,10 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) dev_dbg(dev, "Waiting for all pending threads to complete\n"); wake_up_all(&mhi_cntrl->state_event); - dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); - device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); + if (destroy_device) { + dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); + device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); + } mutex_lock(&mhi_cntrl->pm_mutex); @@ -801,7 +804,10 @@ void mhi_pm_st_worker(struct work_struct *work) mhi_pm_sys_error_transition(mhi_cntrl); break; case DEV_ST_TRANSITION_DISABLE: - mhi_pm_disable_transition(mhi_cntrl); + mhi_pm_disable_transition(mhi_cntrl, false); + break; + case DEV_ST_TRANSITION_DISABLE_DESTROY_DEVICE: + mhi_pm_disable_transition(mhi_cntrl, true); break; default: break; @@ -1154,7 +1160,8 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl) } EXPORT_SYMBOL_GPL(mhi_async_power_up); -void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) +void __mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful, + bool destroy_device) { enum mhi_pm_state cur_state, transition_state; struct device *dev = &mhi_cntrl->mhi_dev->dev; @@ -1190,14 +1197,19 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) write_unlock_irq(&mhi_cntrl->pm_lock); mutex_unlock(&mhi_cntrl->pm_mutex); - mhi_queue_state_transition(mhi_cntrl, DEV_ST_TRANSITION_DISABLE); + if (destroy_device) + mhi_queue_state_transition(mhi_cntrl, + DEV_ST_TRANSITION_DISABLE_DESTROY_DEVICE); + else + mhi_queue_state_transition(mhi_cntrl, + DEV_ST_TRANSITION_DISABLE); /* Wait for shutdown to complete */ flush_work(&mhi_cntrl->st_worker); disable_irq(mhi_cntrl->irq[0]); } -EXPORT_SYMBOL_GPL(mhi_power_down); +EXPORT_SYMBOL_GPL(__mhi_power_down); int mhi_sync_power_up(struct mhi_controller *mhi_cntrl) { diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 039943ec4d4e..85edc9c5df88 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -644,12 +644,37 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl); */ int mhi_sync_power_up(struct mhi_controller *mhi_cntrl); +void __mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful, + bool destroy_device); + /** - * mhi_power_down - Start MHI power down sequence + * mhi_power_down - Start MHI power down sequence. See also + * mhi_power_down_no_destroy() which is a variant of this for suspend. + * * @mhi_cntrl: MHI controller * @graceful: Link is still accessible, so do a graceful shutdown process */ -void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful); +static inline void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) +{ + __mhi_power_down(mhi_cntrl, graceful, true); +} + +/** + * mhi_power_down_no_destroy - Start MHI power down sequence but don't + * destroy struct devices. This is a variant for mhi_power_down() and is a + * workaround to make it possible to use mhi_power_up() in a resume + * handler. When using this variant the caller must also call + * mhi_prepare_all_for_transfer_autoqueue() and + * mhi_unprepare_all_from_transfer(). + * + * @mhi_cntrl: MHI controller + * @graceful: Link is still accessible, so do a graceful shutdown process + */ +static inline void mhi_power_down_no_destroy(struct mhi_controller *mhi_cntrl, + bool graceful) +{ + __mhi_power_down(mhi_cntrl, graceful, false); +} /** * mhi_unprepare_after_power_down - Free any allocated memory after power down