linux-kernel - Re: [PATCH v3 1/5] usb: gadget: Properly configure the device for remote wakeup

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Message-ID: <2cd37948-8927-3a30-eb40-846d7ac8f0fd@quicinc.com>
Date:   Mon, 6 Feb 2023 12:30:14 -0800
From:   Elson Serrao <quic_eserrao@...cinc.com>
To:     Alan Stern <stern@...land.harvard.edu>
CC:     <gregkh@...uxfoundation.org>, <Thinh.Nguyen@...opsys.com>,
        <balbi@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <quic_wcheng@...cinc.com>,
        <quic_jackp@...cinc.com>
Subject: Re: [PATCH v3 1/5] usb: gadget: Properly configure the device for
 remote wakeup



On 2/6/2023 12:14 PM, Alan Stern wrote:
> On Mon, Feb 06, 2023 at 11:13:22AM -0800, Elson Roy Serrao wrote:
>> The wakeup bit in the bmAttributes field indicates whether the device
>> is configured for remote wakeup. But this field should be allowed to
>> set only if the UDC supports such wakeup mechanism. So configure this
>> field based on UDC capability. Also inform the UDC whether the device
>> is configured for remote wakeup by implementing a gadget op.
>>
>> Signed-off-by: Elson Roy Serrao <quic_eserrao@...cinc.com>
>> ---
>>   drivers/usb/gadget/composite.c | 24 +++++++++++++++++++++++-
>>   drivers/usb/gadget/udc/core.c  | 27 +++++++++++++++++++++++++++
>>   drivers/usb/gadget/udc/trace.h |  5 +++++
>>   include/linux/usb/gadget.h     |  8 ++++++++
>>   4 files changed, 63 insertions(+), 1 deletion(-)
> 
>> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
>> index dc3092c..05d1449 100644
>> --- a/include/linux/usb/gadget.h
>> +++ b/include/linux/usb/gadget.h
>> @@ -309,6 +309,7 @@ struct usb_udc;
>>   struct usb_gadget_ops {
>>   	int	(*get_frame)(struct usb_gadget *);
>>   	int	(*wakeup)(struct usb_gadget *);
>> +	int	(*set_remotewakeup)(struct usb_gadget *, int set);
>>   	int	(*set_selfpowered) (struct usb_gadget *, int is_selfpowered);
>>   	int	(*vbus_session) (struct usb_gadget *, int is_active);
>>   	int	(*vbus_draw) (struct usb_gadget *, unsigned mA);
>> @@ -383,6 +384,8 @@ struct usb_gadget_ops {
>>    * @connected: True if gadget is connected.
>>    * @lpm_capable: If the gadget max_speed is FULL or HIGH, this flag
>>    *	indicates that it supports LPM as per the LPM ECN & errata.
>> + * @rw_capable: True if gadget is capable of sending remote wakeup.
>> + * @rw_armed: True if gadget is armed by the host for remote wakeup.
> 
> Minor stylistic request: Could you choose something other than "rw" to
> start these field names?  For too many people, that abbreviation is
> firmly associated with "read/write".  Maybe just "wakeup"?
> 
> Alan Stern

Sure. Agree that "rw" is firmly associated with "read/write". Will just 
rename it to "wakeup"

Thanks
Elson