From patchwork Fri May 26 22:45:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elson Roy Serrao X-Patchwork-Id: 686367 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 47D47C77B73 for ; Fri, 26 May 2023 22:45:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231407AbjEZWp5 (ORCPT ); Fri, 26 May 2023 18:45:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229964AbjEZWpz (ORCPT ); Fri, 26 May 2023 18:45:55 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B7DCA4; Fri, 26 May 2023 15:45:54 -0700 (PDT) Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34QMgGXa017915; Fri, 26 May 2023 22:45:52 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=qcppdkim1; bh=2gLJXTA1XDT+hIurGpTWON7QJm4XVcTcFoJyJZ95iXA=; b=i7ZM/NeCjXNpCJnk4GAUeKS3ZP6HPPHN7CpW7LO3n03f+yj7KhsMxT9NSA5vk9YsFo/z 3HXA+jpQJru156DLPZbq5ivQQmmuPVPIK5FY1IXBQ4agTeG4B4UrtLhQ7l5aQ9U94Ax3 DX7bgD3LKTGXK8h3O9xGOTgK186ToeyBc4VGB/I1mm1n0GMiOdEurfGQonM1ZDgGiwb1 i+Qy98rBx8Exy9V44X2c3C5ZMY/bxtF93EXyF62cFYnuauRhoBLyZYB6kuZry5zlpHYG 6V1vkGjhjXV1GLDvHBMDbyabI0dASTw+vv9cRozY2jVF7uSCnwJ9MVa1qvUm0N3K1ngU WA== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3qtvy29ahx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 26 May 2023 22:45:51 +0000 Received: from pps.filterd (NALASPPMTA03.qualcomm.com [127.0.0.1]) by NALASPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 34QMjp3f016423; Fri, 26 May 2023 22:45:51 GMT Received: from pps.reinject (localhost [127.0.0.1]) by NALASPPMTA03.qualcomm.com (PPS) with ESMTPS id 3qpq9mg1c8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 26 May 2023 22:45:51 +0000 Received: from NALASPPMTA03.qualcomm.com (NALASPPMTA03.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 34QMjoXK016417; Fri, 26 May 2023 22:45:50 GMT Received: from hu-devc-lv-c.qualcomm.com (hu-eserrao-lv.qualcomm.com [10.47.235.164]) by NALASPPMTA03.qualcomm.com (PPS) with ESMTP id 34QMjowE016416; Fri, 26 May 2023 22:45:50 +0000 Received: by hu-devc-lv-c.qualcomm.com (Postfix, from userid 464172) id 6EC5120E42; Fri, 26 May 2023 15:45:50 -0700 (PDT) From: Elson Roy Serrao To: gregkh@linuxfoundation.org, Thinh.Nguyen@synopsys.com Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, quic_wcheng@quicinc.com, quic_jackp@quicinc.com, Elson Roy Serrao Subject: [PATCH v2 2/2] usb: dwc3: Modify runtime pm ops to handle bus suspend Date: Fri, 26 May 2023 15:45:40 -0700 Message-Id: <1685141140-26228-3-git-send-email-quic_eserrao@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1685141140-26228-1-git-send-email-quic_eserrao@quicinc.com> References: <1685141140-26228-1-git-send-email-quic_eserrao@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: -ULLHTKeZdnN1btkz_L-tORyY9SKSmsl X-Proofpoint-ORIG-GUID: -ULLHTKeZdnN1btkz_L-tORyY9SKSmsl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-05-26_12,2023-05-25_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 adultscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=413 phishscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305260195 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org For bus suspend scenario we should skip controller halt as we still have the usb cable connected. So modify the runtime pm ops to handle bus suspend scenario. Also invoke autosuspend when device receives U3 notification so that controller can enter runtime suspended state. Ensure that the controller is brought out of runtime suspend before triggering remote wakeup. Signed-off-by: Elson Roy Serrao --- drivers/usb/dwc3/core.c | 19 +++++++++++++++++++ drivers/usb/dwc3/gadget.c | 40 +++++++++++++++++++++++++++++++++------- 2 files changed, 52 insertions(+), 7 deletions(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 278cd1c..7787805 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -2119,6 +2119,12 @@ static int dwc3_runtime_suspend(struct device *dev) { struct dwc3 *dwc = dev_get_drvdata(dev); int ret; + u32 reg; + + reg = dwc3_readl(dwc->regs, DWC3_DSTS); + /* For bus suspend case do not halt the controller */ + if (dwc->connected && (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U3)) + return 0; if (dwc3_runtime_checks(dwc)) return -EBUSY; @@ -2135,6 +2141,12 @@ static int dwc3_runtime_resume(struct device *dev) struct dwc3 *dwc = dev_get_drvdata(dev); int ret; + /* resume from bus suspend */ + if (dwc->connected) { + dwc3_gadget_process_pending_events(dwc); + goto resume; + } + ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME); if (ret) return ret; @@ -2149,6 +2161,7 @@ static int dwc3_runtime_resume(struct device *dev) break; } +resume: pm_runtime_mark_last_busy(dev); return 0; @@ -2157,9 +2170,14 @@ static int dwc3_runtime_resume(struct device *dev) static int dwc3_runtime_idle(struct device *dev) { struct dwc3 *dwc = dev_get_drvdata(dev); + u32 reg; switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_DEVICE: + reg = dwc3_readl(dwc->regs, DWC3_DSTS); + /* for bus suspend case return success */ + if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U3 && dwc->connected) + goto autosuspend; if (dwc3_runtime_checks(dwc)) return -EBUSY; break; @@ -2169,6 +2187,7 @@ static int dwc3_runtime_idle(struct device *dev) break; } +autosuspend: pm_runtime_mark_last_busy(dev); pm_runtime_autosuspend(dev); diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 5965796..7587912 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2400,15 +2400,21 @@ static int dwc3_gadget_wakeup(struct usb_gadget *g) return -EINVAL; } - spin_lock_irqsave(&dwc->lock, flags); if (!dwc->gadget->wakeup_armed) { dev_err(dwc->dev, "not armed for remote wakeup\n"); - spin_unlock_irqrestore(&dwc->lock, flags); return -EINVAL; } - ret = __dwc3_gadget_wakeup(dwc, true); + ret = pm_runtime_resume_and_get(dwc->dev); + if (ret < 0) { + pm_runtime_set_suspended(dwc->dev); + return ret; + } + + spin_lock_irqsave(&dwc->lock, flags); + ret = __dwc3_gadget_wakeup(dwc, true); spin_unlock_irqrestore(&dwc->lock, flags); + pm_runtime_put_noidle(dwc->dev); return ret; } @@ -2427,6 +2433,12 @@ static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id) return -EINVAL; } + ret = pm_runtime_resume_and_get(dwc->dev); + if (ret < 0) { + pm_runtime_set_suspended(dwc->dev); + return ret; + } + spin_lock_irqsave(&dwc->lock, flags); /* * If the link is in U3, signal for remote wakeup and wait for the @@ -2437,6 +2449,7 @@ static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id) ret = __dwc3_gadget_wakeup(dwc, false); if (ret) { spin_unlock_irqrestore(&dwc->lock, flags); + pm_runtime_put_noidle(dwc->dev); return -EINVAL; } dwc3_resume_gadget(dwc); @@ -2450,6 +2463,7 @@ static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id) dev_err(dwc->dev, "function remote wakeup failed, ret:%d\n", ret); spin_unlock_irqrestore(&dwc->lock, flags); + pm_runtime_put_noidle(dwc->dev); return ret; } @@ -2711,21 +2725,23 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) /* * Avoid issuing a runtime resume if the device is already in the * suspended state during gadget disconnect. DWC3 gadget was already - * halted/stopped during runtime suspend. + * halted/stopped during runtime suspend except for bus suspend case + * where we would have skipped the controller halt. */ if (!is_on) { pm_runtime_barrier(dwc->dev); - if (pm_runtime_suspended(dwc->dev)) + if (pm_runtime_suspended(dwc->dev) && !dwc->connected) return 0; } /* * Check the return value for successful resume, or error. For a * successful resume, the DWC3 runtime PM resume routine will handle - * the run stop sequence, so avoid duplicate operations here. + * the run stop sequence except for bus resume case, so avoid + * duplicate operations here. */ ret = pm_runtime_get_sync(dwc->dev); - if (!ret || ret < 0) { + if ((!ret && !dwc->connected) || ret < 0) { pm_runtime_put(dwc->dev); return 0; } @@ -4313,6 +4329,8 @@ static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc, dwc3_suspend_gadget(dwc); dwc->link_state = next; + pm_runtime_mark_last_busy(dwc->dev); + pm_request_autosuspend(dwc->dev); } static void dwc3_gadget_interrupt(struct dwc3 *dwc, @@ -4703,7 +4721,15 @@ void dwc3_gadget_process_pending_events(struct dwc3 *dwc) { if (dwc->pending_events) { dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf); + pm_runtime_put(dwc->dev); dwc->pending_events = false; enable_irq(dwc->irq_gadget); + /* + * We have only stored the pending events as part + * of dwc3_interrupt() above, but those events are + * not yet handled. So explicitly invoke the + * interrupt handler for handling those events. + */ + dwc3_thread_interrupt(dwc->irq_gadget, dwc->ev_buf); } }