From: Roger Quadros <rogerq@ti.com> To: <balbi@ti.com> Cc: <tony@atomide.com>, <Joao.Pinto@synopsys.com>, <sergei.shtylyov@cogentembedded.com>, <peter.chen@freescale.com>, <jun.li@freescale.com>, <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-omap@vger.kernel.org> Subject: Re: [PATCH v4 8/9] usb: dwc3: core: Prevent otg events from disabling themselves Date: Thu, 3 Sep 2015 16:54:47 +0300 [thread overview] Message-ID: <55E85127.9020704@ti.com> (raw) In-Reply-To: <20150902144705.GI8299@saruman.tx.rr.com> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 02/09/15 17:47, Felipe Balbi wrote: > On Wed, Sep 02, 2015 at 05:24:23PM +0300, Roger Quadros wrote: >> There is a race happening during dwc3_drd_init() that causes >> otg events to get disabled. This is what happens. >> >> dwc3_otg_irq() happens immediately when PRTCAP is set to OTG, >> even though OEVTEN is 0. This is because BIT 31 IRQ of >> OEVT can't be disabled by OEVTEN. >> We configure OEVTEN in dwc3_otg_init() but dwc3_otg_irq() has >> already saved OEVTEN as 0 into dwc->oevten. So finally when >> dwc3_irq_thread_irq() is called we save 0 into OEVTEN >> thus disabling OTG irqs forever. >> >> We fix this by disabling IRQs when configuring OEVTEN in >> dwc3_otg_init(). >> >> Signed-off-by: Roger Quadros <rogerq@ti.com> > > can't you just merge this patch into the one which introduced the bug to > start with ? Yes, I'll do that. > >> --- >> drivers/usb/dwc3/core.c | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c >> index 684010c..654aebf 100644 >> --- a/drivers/usb/dwc3/core.c >> +++ b/drivers/usb/dwc3/core.c >> @@ -921,6 +921,7 @@ static int dwc3_drd_init(struct dwc3 *dwc) >> int ret, id, vbus; >> struct usb_otg_caps *otgcaps = &dwc->otg_config.otg_caps; >> u32 reg; >> + unsigned long flags; >> >> otgcaps->otg_rev = 0; >> otgcaps->hnp_support = false; >> @@ -993,6 +994,8 @@ try_otg_core: >> goto error; >> } >> >> + spin_lock_irqsave(&dwc->lock, flags); >> + >> /* we need to set OTG to get events from OTG core */ >> dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG); >> /* GUSB2PHYCFG0.SusPHY=0 */ >> @@ -1018,6 +1021,8 @@ try_otg_core: >> /* OCTL.PeriMode = 1 */ >> dwc3_writel(dwc->regs, DWC3_OCTL, DWC3_OCTL_PERIMODE); >> >> + spin_unlock_irqrestore(&dwc->lock, flags); >> + >> dwc3_otg_fsm_sync(dwc); >> usb_otg_sync_inputs(dwc->fsm); >> >> -- >> 2.1.4 >> > - -- cheers, - -roger -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJV6FEnAAoJENJaa9O+djCTSjgQALL73OtdfKAWte2JFxsw1PVT Xeh+ec7FJqNCKb2TwTSgnnWp6BxapbAlkK3kSwhsbgZvZLGtf3IC+xPHWNCs4dZs uCs9oDPC/oAiYBnN3gYZxBFuhe1fsFEuS7aFIzrvKD/+tnXmd0IQ5Yu3k06VDXIM jf/034Wep9AK44fyPy0sLKET1J6/UMvjxvUpEyxj9elbvs+GqzD9qR/GF6Ob8q6d 5f7y4ajMBCgyoC/wpIXDIJi7yqH1MUZq8bdC+7BKyc8Fz7kzVSpU2SL0BSRMU7Jn Mzyx25WbWy1mXkfdgOjXtxx6MH5gV6jIIvqobyXXrK/e0z3kU6OeFprbubsOAvmC fcgRkOrfr1O7/G5Gm7mhU5kLSZF6kvf6MoDPGCd/TbP4OgfYcPiTj5O020qDbRxZ Hfuy/5Xk1oxR2aui1q9ycCWrpSA4L+B4fSpDXUznZw755BhhPnVeoYlXUfcb2sI+ YPNs6cLeX95I27AoMpK0wjMptmswaKcDmwv50mjK0kXgUcnVGs6z7YxSIJ2eAxPV OpYLwVTfJiqoeJMscHvqoipwjlHqq4xS780SbzgZTDFOk2Ik7l0B6mNoL9CgaaXa LVCBEywdWo+9os4b3JRrjDSqqdOMhBVaO0GvtiZZqfF7mOTmJHF/yFAODBw/CLXi jAmBC/nM3M32CJphQQ1J =z7cJ -----END PGP SIGNATURE-----
WARNING: multiple messages have this Message-ID (diff)
From: Roger Quadros <rogerq@ti.com> To: balbi@ti.com Cc: tony@atomide.com, Joao.Pinto@synopsys.com, sergei.shtylyov@cogentembedded.com, peter.chen@freescale.com, jun.li@freescale.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org Subject: Re: [PATCH v4 8/9] usb: dwc3: core: Prevent otg events from disabling themselves Date: Thu, 3 Sep 2015 16:54:47 +0300 [thread overview] Message-ID: <55E85127.9020704@ti.com> (raw) In-Reply-To: <20150902144705.GI8299@saruman.tx.rr.com> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 02/09/15 17:47, Felipe Balbi wrote: > On Wed, Sep 02, 2015 at 05:24:23PM +0300, Roger Quadros wrote: >> There is a race happening during dwc3_drd_init() that causes >> otg events to get disabled. This is what happens. >> >> dwc3_otg_irq() happens immediately when PRTCAP is set to OTG, >> even though OEVTEN is 0. This is because BIT 31 IRQ of >> OEVT can't be disabled by OEVTEN. >> We configure OEVTEN in dwc3_otg_init() but dwc3_otg_irq() has >> already saved OEVTEN as 0 into dwc->oevten. So finally when >> dwc3_irq_thread_irq() is called we save 0 into OEVTEN >> thus disabling OTG irqs forever. >> >> We fix this by disabling IRQs when configuring OEVTEN in >> dwc3_otg_init(). >> >> Signed-off-by: Roger Quadros <rogerq@ti.com> > > can't you just merge this patch into the one which introduced the bug to > start with ? Yes, I'll do that. > >> --- >> drivers/usb/dwc3/core.c | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c >> index 684010c..654aebf 100644 >> --- a/drivers/usb/dwc3/core.c >> +++ b/drivers/usb/dwc3/core.c >> @@ -921,6 +921,7 @@ static int dwc3_drd_init(struct dwc3 *dwc) >> int ret, id, vbus; >> struct usb_otg_caps *otgcaps = &dwc->otg_config.otg_caps; >> u32 reg; >> + unsigned long flags; >> >> otgcaps->otg_rev = 0; >> otgcaps->hnp_support = false; >> @@ -993,6 +994,8 @@ try_otg_core: >> goto error; >> } >> >> + spin_lock_irqsave(&dwc->lock, flags); >> + >> /* we need to set OTG to get events from OTG core */ >> dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG); >> /* GUSB2PHYCFG0.SusPHY=0 */ >> @@ -1018,6 +1021,8 @@ try_otg_core: >> /* OCTL.PeriMode = 1 */ >> dwc3_writel(dwc->regs, DWC3_OCTL, DWC3_OCTL_PERIMODE); >> >> + spin_unlock_irqrestore(&dwc->lock, flags); >> + >> dwc3_otg_fsm_sync(dwc); >> usb_otg_sync_inputs(dwc->fsm); >> >> -- >> 2.1.4 >> > - -- cheers, - -roger -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJV6FEnAAoJENJaa9O+djCTSjgQALL73OtdfKAWte2JFxsw1PVT Xeh+ec7FJqNCKb2TwTSgnnWp6BxapbAlkK3kSwhsbgZvZLGtf3IC+xPHWNCs4dZs uCs9oDPC/oAiYBnN3gYZxBFuhe1fsFEuS7aFIzrvKD/+tnXmd0IQ5Yu3k06VDXIM jf/034Wep9AK44fyPy0sLKET1J6/UMvjxvUpEyxj9elbvs+GqzD9qR/GF6Ob8q6d 5f7y4ajMBCgyoC/wpIXDIJi7yqH1MUZq8bdC+7BKyc8Fz7kzVSpU2SL0BSRMU7Jn Mzyx25WbWy1mXkfdgOjXtxx6MH5gV6jIIvqobyXXrK/e0z3kU6OeFprbubsOAvmC fcgRkOrfr1O7/G5Gm7mhU5kLSZF6kvf6MoDPGCd/TbP4OgfYcPiTj5O020qDbRxZ Hfuy/5Xk1oxR2aui1q9ycCWrpSA4L+B4fSpDXUznZw755BhhPnVeoYlXUfcb2sI+ YPNs6cLeX95I27AoMpK0wjMptmswaKcDmwv50mjK0kXgUcnVGs6z7YxSIJ2eAxPV OpYLwVTfJiqoeJMscHvqoipwjlHqq4xS780SbzgZTDFOk2Ik7l0B6mNoL9CgaaXa LVCBEywdWo+9os4b3JRrjDSqqdOMhBVaO0GvtiZZqfF7mOTmJHF/yFAODBw/CLXi jAmBC/nM3M32CJphQQ1J =z7cJ -----END PGP SIGNATURE-----
next prev parent reply other threads:[~2015-09-03 13:55 UTC|newest] Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-09-02 14:24 [PATCH v4 0/9] usb: dwc3: add dual-role support Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:24 ` [PATCH v4 1/9] " Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:31 ` Felipe Balbi 2015-09-02 14:31 ` Felipe Balbi 2015-09-03 12:21 ` Roger Quadros 2015-09-03 12:21 ` Roger Quadros 2015-09-03 15:44 ` Felipe Balbi 2015-09-03 15:44 ` Felipe Balbi 2015-09-04 9:06 ` Roger Quadros 2015-09-04 9:06 ` Roger Quadros 2015-09-07 9:42 ` Roger Quadros 2015-09-07 9:42 ` Roger Quadros 2015-09-06 2:02 ` Peter Chen 2015-09-06 2:02 ` Peter Chen 2015-09-07 9:39 ` Roger Quadros 2015-09-07 9:39 ` Roger Quadros 2015-09-02 14:24 ` [PATCH v4 2/9] usb: dwc3: core.h: add some register definitions Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:24 ` [PATCH v4 3/9] usb: dwc3: dwc3-omap: Make the wrapper interrupt shared Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:32 ` Felipe Balbi 2015-09-02 14:32 ` Felipe Balbi 2015-09-02 14:24 ` [PATCH v4 4/9] usb: dwc3: core: Adapt to named interrupts Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:34 ` Felipe Balbi 2015-09-02 14:34 ` Felipe Balbi 2015-09-03 12:46 ` Roger Quadros 2015-09-03 12:46 ` Roger Quadros 2015-09-03 15:48 ` Felipe Balbi 2015-09-03 15:48 ` Felipe Balbi 2015-09-04 9:11 ` Roger Quadros 2015-09-04 9:11 ` Roger Quadros 2015-09-02 14:24 ` [PATCH v4 5/9] usb: dwc3: core: make dual-role work with OTG irq Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:43 ` Felipe Balbi 2015-09-02 14:43 ` Felipe Balbi 2015-09-03 13:52 ` Roger Quadros 2015-09-03 13:52 ` Roger Quadros 2015-09-03 15:51 ` Felipe Balbi 2015-09-03 15:51 ` Felipe Balbi 2015-09-04 9:13 ` Roger Quadros 2015-09-04 9:13 ` Roger Quadros 2015-09-06 2:20 ` Peter Chen 2015-09-06 2:20 ` Peter Chen 2015-09-15 14:46 ` Roger Quadros 2015-09-15 14:46 ` Roger Quadros 2015-09-02 14:24 ` [PATCH v4 6/9] usb: dwc3: save/restore OTG registers during suspend/resume Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:44 ` Felipe Balbi 2015-09-02 14:44 ` Felipe Balbi 2015-09-03 13:54 ` Roger Quadros 2015-09-03 13:54 ` Roger Quadros 2015-09-02 14:24 ` [PATCH v4 7/9] usb: dwc3: gadget: Fix suspend/resume during dual-role mode Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:24 ` [PATCH v4 8/9] usb: dwc3: core: Prevent otg events from disabling themselves Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:47 ` Felipe Balbi 2015-09-02 14:47 ` Felipe Balbi 2015-09-03 13:54 ` Roger Quadros [this message] 2015-09-03 13:54 ` Roger Quadros 2015-09-02 14:24 ` [PATCH v4 9/9] usb: dwc3: core: don't break during suspend/resume while we're dual-role Roger Quadros 2015-09-02 14:24 ` Roger Quadros 2015-09-02 14:48 ` Felipe Balbi 2015-09-02 14:48 ` Felipe Balbi 2015-09-03 14:02 ` Roger Quadros 2015-09-03 14:02 ` Roger Quadros 2015-09-02 17:22 ` Sergei Shtylyov 2015-09-03 14:01 ` Roger Quadros 2015-09-03 14:01 ` Roger Quadros 2015-09-03 14:05 ` Sergei Shtylyov 2015-09-03 14:05 ` Sergei Shtylyov 2015-09-03 14:10 ` Roger Quadros 2015-09-03 14:10 ` Roger Quadros 2015-09-03 14:13 ` Sergei Shtylyov
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