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From:   Pawel Laszczak <pawell@cadence.com>
To:     Greg KH <gregkh@linuxfoundation.org>
CC:     "felipe.balbi@linux.intel.com" <felipe.balbi@linux.intel.com>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        "rogerq@ti.com" <rogerq@ti.com>,
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        Jayshri Dajiram Pawar <jpawar@cadence.com>,
        Rahul Kumar <kurahul@cadence.com>,
        Sanket Parmar <sparmar@cadence.com>,
        Peter Chan <peter.chan@nxp.com>
Subject: RE: [PATCH] usb: cdns3: Fix: ARM core hang after connect/disconnect
 operation.
Thread-Topic: [PATCH] usb: cdns3: Fix: ARM core hang after connect/disconnect
 operation.
Thread-Index: AQHVxhgd/L7cK1vWyke0JuU/54YkXqfg0gYAgADnxWA=
Date:   Thu, 9 Jan 2020 04:16:26 +0000
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Hi,

>
>
>On Wed, Jan 08, 2020 at 12:37:18PM +0100, Pawel Laszczak wrote:
>> The ARM core hang when access USB register after tens of thousands
>> connect/disconnect operation.
>>
>> The issue was observed on platform with android system and is not easy
>> to reproduce. During test controller works at HS device mode with host
>> connected.
>>
>> The test is based on continuous disabling/enabling USB device function
>> what cause continuous setting DEVDS/DEVEN bit in USB_CONF register.
>>
>> For testing was used composite device consisting from ADP and RNDIS
>> function.
>>
>> Presumably the problem was caused by DMA transfer made after setting
>> DEVDS bit. To resolve this issue fix stops all DMA transfer before
>> setting DEVDS bit.
>>
>> Signed-off-by: Pawel Laszczak <pawell@cadence.com>
>> Signed-off-by: Peter Chan <peter.chan@nxp.com>
>> Reported-by: Peter Chan <peter.chan@nxp.com>
>> Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
>> ---
>>  drivers/usb/cdns3/gadget.c | 84 ++++++++++++++++++++++++++------------
>>  drivers/usb/cdns3/gadget.h |  1 +
>>  2 files changed, 58 insertions(+), 27 deletions(-)
>
>Any reason to forget linux-usb@vger.kernel.org for usb patches?

No reason. I missed it.=20
+ linux-usb@vger.kernel.org

Thanks,
Pawell

>
>thanks,
>
>greg k-h