From mboxrd@z Thu Jan 1 00:00:00 1970 From: William Wu Subject: [PATCH] arm64: dts: rockchip: disable tx ipgap linecheck for rk3399 dwc3 Date: Thu, 17 Aug 2017 16:24:32 +0800 Message-ID: <1502958272-1384-1-git-send-email-william.wu@rock-chips.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: heiko@sntech.de Cc: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, frank.wang@rock-chips.com, huangtao@rock-chips.com, daniel.meng@rock-chips.com, william.wu@rock-chips.com List-Id: linux-rockchip.vger.kernel.org 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 --- arch/arm64/boot/dts/rockchip/rk3399.dtsi | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi index 27a4616..69cb311 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi @@ -412,6 +412,7 @@ snps,dis-u2-freeclk-exists-quirk; snps,dis_u2_susphy_quirk; snps,dis-del-phy-power-chg-quirk; + snps,dis-tx-ipgap-linecheck-quirk; status = "disabled"; }; }; @@ -439,6 +440,7 @@ snps,dis-u2-freeclk-exists-quirk; snps,dis_u2_susphy_quirk; snps,dis-del-phy-power-chg-quirk; + snps,dis-tx-ipgap-linecheck-quirk; status = "disabled"; }; }; -- 2.0.0