From patchwork Thu Mar 19 08:49:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Kepplinger X-Patchwork-Id: 11446729 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B8B291874 for ; Thu, 19 Mar 2020 08:50:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A269E20753 for ; Thu, 19 Mar 2020 08:50:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726623AbgCSIul (ORCPT ); Thu, 19 Mar 2020 04:50:41 -0400 Received: from comms.puri.sm ([159.203.221.185]:33218 "EHLO comms.puri.sm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725787AbgCSIul (ORCPT ); Thu, 19 Mar 2020 04:50:41 -0400 Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id 79038DFD58; Thu, 19 Mar 2020 01:50:40 -0700 (PDT) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mVIS9R2TCHKD; Thu, 19 Mar 2020 01:50:39 -0700 (PDT) From: Martin Kepplinger To: balbi@kernel.org Cc: gregkh@linuxfoundation.org, rogerq@ti.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Kepplinger Subject: [PATCH v2] usb: dwc3: support continuous runtime PM with dual role Date: Thu, 19 Mar 2020 09:49:02 +0100 Message-Id: <20200319084902.24747-1-martin.kepplinger@puri.sm> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The DRD module calls dwc3_set_mode() on role switches, i.e. when a device is being pugged in. In order to support continuous runtime power management when plugging in / unplugging a cable, we need to call pm_runtime_get() in this path. Signed-off-by: Martin Kepplinger --- revision history ---------------- v2: move pm_rumtime calls into workqueue (thanks Roger) remove unrelated documentation patch v1: https://lore.kernel.org/linux-usb/ef22f8de-9bfd-c1d5-111c-696f1336dbda@puri.sm/T/ drivers/usb/dwc3/core.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 1d85c42b9c67..0c058b2ac21d 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -121,17 +121,19 @@ static void __dwc3_set_mode(struct work_struct *work) if (dwc->dr_mode != USB_DR_MODE_OTG) return; + pm_runtime_get(dwc->dev); + if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG) dwc3_otg_update(dwc, 0); if (!dwc->desired_dr_role) - return; + goto out; if (dwc->desired_dr_role == dwc->current_dr_role) - return; + goto out; if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev) - return; + goto out; switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_HOST: @@ -190,6 +192,9 @@ static void __dwc3_set_mode(struct work_struct *work) break; } +out: + pm_runtime_mark_last_busy(dwc->dev); + pm_runtime_put_autosuspend(dwc->dev); } void dwc3_set_mode(struct dwc3 *dwc, u32 mode)