linux-kernel - [PATCH 1/1] arm64: dts: imx8: fix USB 3.0 Gadget Failure in QM & QXPB0 at super speed

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Date:   Thu, 13 Apr 2023 11:50:43 -0400
From:   Frank Li <Frank.Li@....com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Peter Chen <peter.chen@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/FREESCALE IMX
        / MXC ARM ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Cc:     pawell@...ence.com, imx@...ts.linux.dev
Subject: [PATCH 1/1] arm64: dts: imx8: fix USB 3.0 Gadget Failure in QM & QXPB0 at super speed

Resolve USB 3.0 gadget failure for QM and QXPB0 in super speed mode with single
IN and OUT endpoints, like mass storage devices, due to incorrect
ACTUAL_MEM_SIZE in ep_cap2 (32k instead of actual 18k). Implement dt property
cdns,on-chip-buff-size to override ep_cap2 and set it to 18k for imx8QM and
imx8QXP chips. No adverse effects for 8QXP C0.

Fixes: dce49449e04ff ("usb: cdns3: allocate TX FIFO size according to composite EP number")

Signed-off-by: Frank Li <Frank.Li@....com>
---
 arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi b/arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi
index b32c2e199c160..030c273c8be40 100644
--- a/arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi
@@ -171,6 +171,7 @@ usbotg3_cdns3: usb@...20000 {
 			interrupt-names = "host", "peripheral", "otg", "wakeup";
 			phys = <&usb3_phy>;
 			phy-names = "cdns3,usb3-phy";
+			cdns,on-chip-buff-size = /bits/ 16 <18>;
 			status = "disabled";
 		};
 	};
-- 
2.34.1