From patchwork Mon Aug 14 18:50:43 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: 13353193 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 16931C001DB for ; Mon, 14 Aug 2023 18:51:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231562AbjHNSvZ (ORCPT ); Mon, 14 Aug 2023 14:51:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43174 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231480AbjHNSu7 (ORCPT ); Mon, 14 Aug 2023 14:50:59 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C58971702; Mon, 14 Aug 2023 11:50:56 -0700 (PDT) Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 37EFfX9J001504; Mon, 14 Aug 2023 18:50:50 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=0wudGJldtlwunr98sGpUf9GmmUa3rnET/QHaHz1GKjU=; b=gx/OQbrptJN5JkPxdOJGDiy+Trh69EeXgyXL0TDshJMc9KElQpEDJP/+UA3zUGVowQwX cwSOvak9pL7PiLCyCTWi44jsOvHXWyO2cRq50xyV+JEvyPpypOOX6DNw1MH0AP+cQtHY 1qYSTyBCtUb/0ap+IBbTouB3SOJ7v9DzF7bDpwhLvO1vCi00itBVRHSqAhwfI2Gy1N7G 2udx5Yt+yhq+fe2h19jm3ujpLUj9rWxYFbvmXvGPRZ9badoagR1lf2vCw5LzDpdQgVOl ftkz+PS/6mCIOQqpDJegUUfXPlPn3EJObq5i8gXsgopSB0+hbN6mGZxySBev2onz3jW0 dA== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3se3j94mvj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 14 Aug 2023 18:50:50 +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 37EImhtU006572; Mon, 14 Aug 2023 18:50:49 GMT Received: from pps.reinject (localhost [127.0.0.1]) by NALASPPMTA03.qualcomm.com (PPS) with ESMTP id 3se35kvvjh-1; Mon, 14 Aug 2023 18:50:49 +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 37EIon1K009287; Mon, 14 Aug 2023 18:50:49 GMT Received: from hu-devc-lv-u18-c.qualcomm.com (hu-eserrao-lv.qualcomm.com [10.47.235.27]) by NALASPPMTA03.qualcomm.com (PPS) with ESMTP id 37EIomYo009282; Mon, 14 Aug 2023 18:50:48 +0000 Received: by hu-devc-lv-u18-c.qualcomm.com (Postfix, from userid 464172) id BA37C5005B2; Mon, 14 Aug 2023 11:50:48 -0700 (PDT) From: Elson Roy Serrao To: gregkh@linuxfoundation.org, Thinh.Nguyen@synopsys.com, rogerq@kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Elson Roy Serrao Subject: [PATCH v4 3/3] usb: dwc3: Modify runtime pm ops to handle bus suspend Date: Mon, 14 Aug 2023 11:50:43 -0700 Message-Id: <20230814185043.9252-4-quic_eserrao@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230814185043.9252-1-quic_eserrao@quicinc.com> References: <20230814185043.9252-1-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-ORIG-GUID: 1NVKeTNAtkk-FSmaW215qspSanrIqpjc X-Proofpoint-GUID: 1NVKeTNAtkk-FSmaW215qspSanrIqpjc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-08-14_15,2023-08-10_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 malwarescore=0 priorityscore=1501 mlxscore=0 adultscore=0 mlxlogscore=892 suspectscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 clxscore=1015 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308140174 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The current implementation blocks the runtime pm operations when cable is connected. This would block dwc3 to enter a low power state during bus suspend scenario. Modify the runtime pm ops to handle bus suspend case for such platforms where the controller low power mode entry/exit is handled by the glue driver. This enablement is controlled through a dt property and platforms capable of detecting bus resume can benefit from this feature. Also modify the remote wakeup operations to trigger runtime resume before sending wakeup signal. Signed-off-by: Elson Roy Serrao --- drivers/usb/dwc3/core.c | 28 ++++++++++++++++++++++++++-- drivers/usb/dwc3/core.h | 3 +++ drivers/usb/dwc3/gadget.c | 32 +++++++++++++++++++++++++------- 3 files changed, 54 insertions(+), 9 deletions(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 9c6bf054f15d..9bfd9bb18caf 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1518,6 +1518,9 @@ static void dwc3_get_properties(struct dwc3 *dwc) dwc->dis_split_quirk = device_property_read_bool(dev, "snps,dis-split-quirk"); + dwc->runtime_suspend_on_usb_suspend = device_property_read_bool(dev, + "snps,runtime-suspend-on-usb-suspend"); + dwc->lpm_nyet_threshold = lpm_nyet_threshold; dwc->tx_de_emphasis = tx_de_emphasis; @@ -2029,6 +2032,9 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_DEVICE: + /* runtime resume on bus resume scenario */ + if (PMSG_IS_AUTO(msg) && dwc->connected) + break; ret = dwc3_core_init_for_resume(dwc); if (ret) return ret; @@ -2090,8 +2096,13 @@ static int dwc3_runtime_checks(struct dwc3 *dwc) { switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_DEVICE: - if (dwc->connected) + if (dwc->connected) { + /* bus suspend scenario */ + if (dwc->runtime_suspend_on_usb_suspend && + dwc->suspended) + break; return -EBUSY; + } break; case DWC3_GCTL_PRTCAP_HOST: default: @@ -2107,9 +2118,22 @@ static int dwc3_runtime_suspend(struct device *dev) struct dwc3 *dwc = dev_get_drvdata(dev); int ret; - if (dwc3_runtime_checks(dwc)) + ret = dwc3_runtime_checks(dwc); + if (ret) return -EBUSY; + switch (dwc->current_dr_role) { + case DWC3_GCTL_PRTCAP_DEVICE: + /* bus suspend case */ + if (!ret && dwc->connected) + return 0; + break; + case DWC3_GCTL_PRTCAP_HOST: + default: + /* do nothing */ + break; + } + ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND); if (ret) return ret; diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index a69ac67d89fe..f2f788a6b4b5 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1124,6 +1124,8 @@ struct dwc3_scratchpad_array { * @num_ep_resized: carries the current number endpoints which have had its tx * fifo resized. * @debug_root: root debugfs directory for this device to put its files in. + * @runtime_suspend_on_usb_suspend: true if dwc3 runtime suspend is allowed + * during bus suspend scenario. */ struct dwc3 { struct work_struct drd_work; @@ -1340,6 +1342,7 @@ struct dwc3 { int last_fifo_depth; int num_ep_resized; struct dentry *debug_root; + bool runtime_suspend_on_usb_suspend; }; #define INCRX_BURST_MODE 0 diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 5fd067151fbf..978ce0e91164 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2401,15 +2401,21 @@ 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; } @@ -2428,6 +2434,12 @@ 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 @@ -2438,6 +2450,7 @@ 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); @@ -2452,6 +2465,7 @@ 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; } @@ -2732,21 +2746,23 @@ 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); if (ret < 0) pm_runtime_set_suspended(dwc->dev); @@ -4331,6 +4347,8 @@ static void dwc3_gadget_suspend_interrupt(struct dwc3 *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,