linux-kernel - [PATCH v4 0/2] Fix vbus draw of dwc3 gadget

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Message-ID: <1677217619-10261-1-git-send-email-quic_prashk@quicinc.com>
Date:   Fri, 24 Feb 2023 11:16:57 +0530
From:   Prashanth K <quic_prashk@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Jó Ágila Bitsch <jgilab@...il.com>,
        Alan Stern <stern@...land.harvard.edu>
CC:     Pratham Pratap <quic_ppratap@...cinc.com>,
        Jack Pham <quic_jackp@...cinc.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Prashanth K <quic_prashk@...cinc.com>
Subject: [PATCH v4 0/2] Fix vbus draw of dwc3 gadget

Changes in v4
 - Added corresponding BC1.2 spec section in commit text

Changes in v3
 - Fixed minor syntax error and warnings

Changes in v2
 - Added min() calculation against CONFIG_USB_GADGET_VBUS_DRAW in case
  of unconfigured state.

Currently dwc3 gadget processes the suspend interrupt event only
if the device is in configured state. But consider a case where
device is not configured and got suspend interrupt, in that case
our gadget would still use 100mA as composite_suspend didn't happen.
But battery charging specification (BC1.2) expects a downstream
device to draw less than 2.5mA when unconnected OR suspended.

And while resuming, the gadget can draw upto 100mA if its not
configured, but the current implementation of composite_resume
doesn't consider the case of unconfigured device. This series
addresses the above mentioned issues.

Prashanth K (2):
  usb: dwc3: gadget: Change condition for processing suspend event
  usb: gadget: composite: Draw 100mA current if not configured

Prashanth K (2):
  usb: dwc3: gadget: Change condition for processing suspend event
  usb: gadget: composite: Draw 100mA current if not configured

 drivers/usb/dwc3/gadget.c      | 11 ++---------
 drivers/usb/gadget/composite.c |  4 ++++
 2 files changed, 6 insertions(+), 9 deletions(-)

-- 
2.7.4