linux-kernel - [PATCH v2 2/2] arm64: dts: imx8: fix USB 3.0 Gadget Failure in QM & QXPB0 at super speed

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Date:   Mon, 15 May 2023 11:37:10 -0400
From:   Frank Li <Frank.Li@....com>
To:     shawnguo@...nel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <peter.chen@...nel.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:     imx@...ts.linux.dev
Subject: [PATCH v2 2/2] 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: dce49449e04f ("usb: cdns3: allocate TX FIFO size according to composite EP number")
Signed-off-by: Frank Li <Frank.Li@....com>
---
change from v1 to v2
- fixes warning from check-patch
- update dt-binding doc

 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 b32c2e199c16..030c273c8be4 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