From: Ikjoon Jang <ikjn@chromium.org>
To: linux-usb@vger.kernel.org, devicetree@vger.kernel.org
Cc: GregKroah-Hartman <gregkh@linuxfoundation.org>,
RobHerring <robh+dt@kernel.org>,
MarkRutland <mark.rutland@arm.com>,
AlanStern <stern@rowland.harvard.edu>,
SuwanKim <suwan.kim027@gmail.com>,
"GustavoA . R . Silva" <gustavo@embeddedor.com>,
IkjoonJang <ikjn@chromium.org>, JohanHovold <johan@kernel.org>,
linux-kernel@vger.kernel.org, drinkcat@chromium.org
Subject: [PATCH v4 0/2] usb: override hub device bInterval with device
Date: Tue, 3 Dec 2019 18:15:21 +0800 [thread overview]
Message-ID: <20191203101521.198914-1-ikjn@chromium.org> (raw)
This patchset enables hard wired hub device to use different bInterval
from its descriptor when the hub has a combined device node.
When we know reducing autosuspend delay for built-in HIDs is better for
power saving, we can reduce it to the optimal value. But if a parent hub
has a long bInterval, mouse lags a lot from more frequent autosuspend.
So this enables overriding bInterval for a hard wired hub device only
when we know that reduces the power consumption.
Changes in v4
- use of_property_read_u32() instead of of_property_read_u8()
Ikjoon Jang (2):
dt-bindings: usb: add "hub,interval" property
usb: overridable hub bInterval by device node
Documentation/devicetree/bindings/usb/usb-device.txt | 4 ++++
drivers/usb/core/config.c | 9 +++++++++
2 files changed, 13 insertions(+)
--
2.24.0.393.g34dc348eaf-goog
next reply other threads:[~2019-12-03 10:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 10:15 Ikjoon Jang [this message]
2019-12-03 16:40 ` [PATCH v4 0/2] usb: override hub device bInterval with device Johan Hovold
2019-12-04 2:46 ` Ikjoon Jang
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