From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
To: Prashanth K <quic_prashk@quicinc.com>
Cc: "Thinh Nguyen" <Thinh.Nguyen@synopsys.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Jakob Koschel" <jakobkoschel@gmail.com>,
"Jó Ágila Bitsch" <jgilab@gmail.com>,
"Alan Stern" <stern@rowland.harvard.edu>,
"Pratham Pratap" <quic_ppratap@quicinc.com>,
"Jack Pham" <quic_jackp@quicinc.com>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 2/2] usb: gadget: composite: Draw 100mA current if not configured
Date: Fri, 24 Feb 2023 18:38:32 +0000 [thread overview]
Message-ID: <20230224183830.ox65eocunuvlp7zt@synopsys.com> (raw)
In-Reply-To: <3a189c0a-e82b-a80b-ac63-0f2c703b2eaa@quicinc.com>
On Fri, Feb 24, 2023, Prashanth K wrote:
>
>
> On 24-02-23 01:40 am, Thinh Nguyen wrote:
> > On Thu, Feb 23, 2023, Prashanth K wrote:
> > > Currently we don't change the current value if device isn't in
> > > configured state. But the battery charging specification says,
> >
> > Can you provide the spec section also?
> >
> 1.2 Background
> 1.4.13 Standard Downstream Port
>
> Did you mean to add these in the commit message?
Yes, it's better to have the reference in case we need to revisit this.
> > > device can draw up to 100mA of current if its in unconfigured
> >
> > Is this related to being self-powered?
> I think its applicable for bus-powered devices.
No, I mean before configured state, is the device considered
self-powered? Since being self-powered means drawing 100mA or less, we
can use USB_SELF_POWER_VBUS_MAX_DRAW to provide more context. If it's
totally unrelated, then you can ignore this.
Thanks,
Thinh
next prev parent reply other threads:[~2023-02-24 18:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-23 12:41 [PATCH v3 0/2] Fix vbus draw of dwc3 gadget Prashanth K
2023-02-23 12:42 ` [PATCH v3 1/2] usb: dwc3: gadget: Change condition for processing suspend event Prashanth K
2023-02-23 20:03 ` Thinh Nguyen
2023-02-23 12:42 ` [PATCH v3 2/2] usb: gadget: composite: Draw 100mA current if not configured Prashanth K
2023-02-23 20:10 ` Thinh Nguyen
2023-02-24 4:57 ` Prashanth K
2023-02-24 18:38 ` Thinh Nguyen [this message]
2023-02-25 6:35 ` Prashanth K
2023-02-27 19:38 ` Thinh Nguyen
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