From: Wesley Cheng <wcheng@codeaurora.org>
To: peter.chen@nxp.com, balbi@kernel.org, gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
Wesley Cheng <wcheng@codeaurora.org>
Subject: [PATCH 0/3] Add vbus draw support to DWC3
Date: Tue, 29 Dec 2020 15:03:28 -0800 [thread overview]
Message-ID: <1609283011-21997-1-git-send-email-wcheng@codeaurora.org> (raw)
Some devices are connected to standard downstream ports (SDP) and draw current
from them. The current rates are defined in the BC1.2 specification, and
highlights the different charge rates depending on the device state. The DWC3
gadget does not currently have a mechanism to notify external drivers about
how much current can be drawn.
The current rates are notified by the USB gadget layer, and the DWC3 gadget will
propagate this potentially to external charger drivers. Also, the USB gadget
needs to be fixed to only allow 100mA current draw when receiving a bus reset
from the host, as the BC1.2 specification states that this is the max current
draw possible when in the connected and unconfigured state.
Wesley Cheng (3):
usb: dwc3: gadget: Introduce a DWC3 VBUS draw callback
usb: gadget: composite: Split composite reset and disconnect
usb: gadget: configfs: Add a specific configFS reset callback
drivers/usb/dwc3/gadget.c | 11 +++++++++++
drivers/usb/gadget/composite.c | 21 +++++++++++++++++++--
drivers/usb/gadget/configfs.c | 24 +++++++++++++++++++++++-
include/linux/usb/composite.h | 2 ++
4 files changed, 55 insertions(+), 3 deletions(-)
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next reply other threads:[~2020-12-29 23:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-29 23:03 Wesley Cheng [this message]
2020-12-29 23:03 ` [PATCH 1/3] usb: dwc3: gadget: Introduce a DWC3 VBUS draw callback Wesley Cheng
2020-12-29 23:03 ` [PATCH 2/3] usb: gadget: composite: Split composite reset and disconnect Wesley Cheng
2021-01-05 13:14 ` Felipe Balbi
2021-01-08 2:19 ` Thinh Nguyen
2021-01-08 8:35 ` Jack Pham
2021-01-08 22:04 ` Thinh Nguyen
2021-01-08 9:13 ` gregkh
2021-01-08 22:13 ` Thinh Nguyen
2020-12-29 23:03 ` [PATCH 3/3] usb: gadget: configfs: Add a specific configFS reset callback Wesley Cheng
2021-01-04 15:45 ` Greg KH
2021-01-04 19:03 ` Wesley Cheng
-- strict thread matches above, loose matches on Subject: below --
2020-11-14 8:12 [PATCH 0/3] Add vbus draw support to DWC3 Wesley Cheng
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