linux-kernel - Re: [PATCH] arm64: dts: rockchip: disable tx ipgap linecheck for rk3399 dwc3

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Message-ID: <4718044.sxV3Y2WdLf@phil>
Date:   Fri, 18 Aug 2017 11:18:24 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     William Wu <william.wu@...k-chips.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, linux@...linux.org.uk,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        frank.wang@...k-chips.com, huangtao@...k-chips.com,
        daniel.meng@...k-chips.com
Subject: Re: [PATCH] arm64: dts: rockchip: disable tx ipgap linecheck for rk3399 dwc3

Am Donnerstag, 17. August 2017, 16:24:32 CEST schrieb William Wu:
> RK3399 USB DWC3 controller has a issue that FS/LS devices not
> recognized if inserted through USB 3.0 HUB. It's because that
> the inter-packet delay between the SSPLIT token to SETUP token
> is about 566ns, more then the USB spec requirement.
> 
> This patch adds a quirk "snps,dis-tx-ipgap-linecheck-quirk" to
> disable the u2mac linestate check to decrease the SSPLIT token
> to SETUP token inter-packet delay from 566ns to 466ns.
> 
> Signed-off-by: William Wu <william.wu@...k-chips.com>

applied for 4.14


Thanks
Heiko