linux-kernel - Re: [RESEND x2][PATCH 0/3] dwc2 fixes for edge cases on hikey

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Message-ID: <410670D7E743164D87FA6160E7907A560113A3036D@am04wembxa.internal.synopsys.com>
Date:   Thu, 19 Oct 2017 06:46:04 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     John Stultz <john.stultz@...aro.org>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
CC:     John Youn <John.Youn@...opsys.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Wei Xu <xuwei5@...ilicon.com>,
        Guodong Xu <guodong.xu@...aro.org>,
        "Amit Pundir" <amit.pundir@...aro.org>,
        YongQin Liu <yongqin.liu@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Chen Yu <chenyu56@...wei.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [RESEND x2][PATCH 0/3] dwc2 fixes for edge cases on hikey

On 10/17/2017 12:41 PM, Minas Harutyunyan wrote:
> On 10/17/2017 1:34 AM, John Stultz wrote:
>> On Mon, Oct 16, 2017 at 1:36 AM, Minas Harutyunyan
>> <Minas.Harutyunyan@...opsys.com> wrote:
>>> On b-plug disconnect should asserted GOTGINT.SesEndDet interrupt.
>>> According previously sent by you register dump (GHWCFG2 = 0x23affc70)
>>> your core OTG_MODE=0.
>>> Bellow fragment from programming guide on Device disconnect:
>>>
>>> "7.3Device Disconnection
>>> The device session ends when the USB cable is disconnected or if the
>>> VBUS is switched off by the Host. The
>>> device disconnect flow varies depending on the value of the OTG_MODE
>>> configuration parameter.
>>>
>>> When OTG_MODE = 0,1, or 3
>>> When OTG_MODE is set to 0,1, or 3, the device disconnect flow is as follows:
>>> 1. When the USB cable is unplugged or when the VBUS is switched off by
>>> the Host, the Device core
>>> trigger GINTSTS.OTGInt [bit 2] interrupt bit.
>>> 2. When the device application detects GINTSTS.OTGInt interrupt, it
>>> checks that the
>>> GOTGINT.SesEndDet (Session End Detected) bit is set to 1’b1."
>>>
>>> So, you should receive and handle "Session End Detected". In function
>>> dwc2_handle_otg_intr() on this interrupt (in device mode) calling
>>> dwc2_hsotg_disconnect() function. By adding your patch "[PATCH 3/3] usb:
>>> dwc2: Fix UDC state tracking" state changed to not attached as required.
>>
>>
>> So, on the HiKey board (using 4.14-rc5 + Vardan's patch), I'm not
>> seeing the GOTGINT_SES_END_DET in dwc2_handle_otg_intr() when I remove
>> the USB OTG cable.
>>
>> In fact, I'm not seeing any calls to dwc2_handle_otg_intr()... which
>> seems... odd maybe?  Any clues as to what might be going wrong then?
>>
>> thanks
>> -john
>>
> Hi John Stultz,
> So, on Hikey board on unplug B connector GOTGINT.SesEndDet interrupt not
> asserted, instead asserted GINTSTS_CONIDSTSCHNG. Please, confirm.
> 
> In this case without your patch "[PATCH 1/3] usb: dwc2: Improve gadget
> state disconnection handling" but by applying your patch "[PATCH 3/3]
> usb: dwc2: Fix UDC state tracking":
> 1. On B plug connect UDC state will be set to "configured"
> 2. On B plug disconnect - "not attached".
> Is it Ok for you?
> 
> Meantime, I'll check with HW team why GOTGINT.SesEndDet interrupt not
> asserted on unplug B connector.
> 
> Thanks,
> Minas
> 

Hi John Stultz,

Could you please apply this patch. Please not apply your patch series 
"[PATCH 0/3] dwc2 fixes for edge cases on hikey" to check only below patch.
If you confirm that this patch fix your issue with "Transaction Error" 
and " ChHltd set, but reason is unknown" I'll submit to LKML as final patch.
Then can be applied your patch series, without patch 1/3 (changing in 
connector id status change) to correctly set UDC states.

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 
f4ef159b538e..7da22152df68 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -331,6 +331,9 @@ static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
         usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
         usbcfg &= ~(GUSBCFG_HNPCAP | GUSBCFG_SRPCAP);

+       /* Set HS/FS Timeout Calibration */
+       usbcfg |= GUSBCFG_TOUTCAL(7);
+
         switch (hsotg->hw_params.op_mode) {
         case GHWCFG2_OP_MODE_HNP_SRP_CAPABLE:
                 if (hsotg->params.otg_cap ==


Thanks,
Minas