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(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 4V7t_is1SsPq; Tue, 5 May 2020 02:44:14 -0700 (PDT) Subject: Re: [PATCH v3] usb: dwc3: support continuous runtime PM with dual role To: Roger Quadros , balbi@kernel.org Cc: gregkh@linuxfoundation.org, sergei.shtylyov@cogentembedded.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200319100207.19957-1-martin.kepplinger@puri.sm> From: Martin Kepplinger Autocrypt: addr=martin.kepplinger@puri.sm; keydata= mQINBFULfZABEADRxJqDOYAHfrp1w8Egcv88qoru37k1x0Ugy8S6qYtKLAAt7boZW+q5gPv3 Sj2KjfkWA7gotXpASN21OIfE/puKGwhDLAySY1DGNMQ0gIVakUO0ji5GJPjeB9JlmN5hbA87 Si9k3yKQQfv7Cf9Lr1iZaV4A4yjLP/JQMImaCVdC5KyqJ98Luwci1GbsLIGX3EEjfg1+MceO dnJTKZpBAKd1J7S2Ib3dRwvALdiD7zqMGqkw5xrtwasatS7pc6o/BFgA9GxbeIzKmvW/hc3Q amS/sB12BojyzdUJ3TnIoAqvwKTGcv5VYo2Z+3FV+/MJVXPo8cj2vmfxQx1WG4n6X0pK4X8A BkCKw2N/evMZblNqAzzGVtoJvqQYkzQ20Fm+d3wFl6lS1db4MB+kU13G8kEIE22Q3i6kx4NA 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6BSKmJjlWpfkPKzyzjhGQVZrTZYnKAu471hRv8/6Dx5JuZJgDCnYanNx3DDreRMu/nq6TfaO ekMtxgNYb/8oDry09UFHbGHLsWn6oBo= Message-ID: Date: Tue, 5 May 2020 11:44:10 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 24.04.20 09:48, Roger Quadros wrote: > > > On 19/03/2020 12:02, Martin Kepplinger wrote: >> The DRD module calls dwc3_set_mode() on role switches, i.e. when a >> device is >> being plugged in. In order to support continuous runtime power >> management when >> plugging in / unplugging a cable, we need to call >> pm_runtime_get_sync() in >> this path. >> >> Signed-off-by: Martin Kepplinger > > Reviewed-by: Roger Quadros > > thank you very much Roger. Anything else that is holding this back? martin > cheers, > -roger > >> --- >> >> >> revision history >> ---------------- >> v3: call pm_runtime_get_sync() and fix commit message typo (thanks >> Sergei) >> v2: move pm_rumtime calls into workqueue (thanks Roger) >>      remove unrelated documentation patch >>      >> https://lore.kernel.org/linux-usb/7a085229-68a7-d700-1781-14225863a228@cogentembedded.com/T/ >> >> 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..da93faef74a6 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_sync(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) >> >