linux-kernel - [PATCH v4 0/2] usb: override hub device bInterval with device

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Message-Id: <20191203101521.198914-1-ikjn@chromium.org>
Date:   Tue,  3 Dec 2019 18:15:21 +0800
From:   Ikjoon Jang <ikjn@...omium.org>
To:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org
Cc:     GregKroah-Hartman <gregkh@...uxfoundation.org>,
        RobHerring <robh+dt@...nel.org>,
        MarkRutland <mark.rutland@....com>,
        AlanStern <stern@...land.harvard.edu>,
        SuwanKim <suwan.kim027@...il.com>,
        "GustavoA . R . Silva" <gustavo@...eddedor.com>,
        IkjoonJang <ikjn@...omium.org>, JohanHovold <johan@...nel.org>,
        linux-kernel@...r.kernel.org, drinkcat@...omium.org
Subject: [PATCH v4 0/2] usb: override hub device bInterval with device

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