From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: [PATCH v4 9/9] usb: dwc3: core: don't break during suspend/resume while we're dual-role Date: Wed, 2 Sep 2015 20:22:05 +0300 Message-ID: <55E7303D.8080904@cogentembedded.com> References: <1441203864-15786-1-git-send-email-rogerq@ti.com> <1441203864-15786-10-git-send-email-rogerq@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1441203864-15786-10-git-send-email-rogerq@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Roger Quadros , balbi@ti.com Cc: tony@atomide.com, Joao.Pinto@synopsys.com, peter.chen@freescale.com, jun.li@freescale.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org List-Id: linux-omap@vger.kernel.org Hello. On 09/02/2015 05:24 PM, Roger Quadros wrote: > We can't rely just on dr_mode to decide if we're in host or gadget > mode when we're configured as otg/dual-role. So while dr_mode is > OTG, we find out from the otg state machine if we're in host > or gadget mode and take the necessary actions during suspend/resume. > > Also make sure that we disable OTG irq and events during system suspend > so that we don't lockup the system during system suspend/resume. > > Signed-off-by: Roger Quadros > --- > drivers/usb/dwc3/core.c | 27 +++++++++------------------ > 1 file changed, 9 insertions(+), 18 deletions(-) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index 654aebf..25891e3 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -1455,18 +1455,15 @@ static int dwc3_suspend(struct device *dev) > dwc->octl = dwc3_readl(dwc->regs, DWC3_OCTL); > dwc->oevt = dwc3_readl(dwc->regs, DWC3_OEVT); > dwc->oevten = dwc3_readl(dwc->regs, DWC3_OEVTEN); > + dwc3_writel(dwc->regs, DWC3_OEVTEN, 0); > + disable_irq(dwc->otg_irq); > } > > - switch (dwc->dr_mode) { > - case USB_DR_MODE_PERIPHERAL: > - case USB_DR_MODE_OTG: > + if (dwc->dr_mode == USB_DR_MODE_PERIPHERAL || > + ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET))) Hm, you're not very consistent about your parens. :-) [...] > @@ -1506,18 +1503,12 @@ static int dwc3_resume(struct device *dev) > dwc3_writel(dwc->regs, DWC3_OCTL, dwc->octl); > dwc3_writel(dwc->regs, DWC3_OEVT, dwc->oevt); > dwc3_writel(dwc->regs, DWC3_OEVTEN, dwc->oevten); > + enable_irq(dwc->otg_irq); > } > > - switch (dwc->dr_mode) { > - case USB_DR_MODE_PERIPHERAL: > - case USB_DR_MODE_OTG: > + if (dwc->dr_mode == USB_DR_MODE_PERIPHERAL || > + ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET))) Same here... [...] WBR, Sergei