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arm64: dts: imx8: fix USB 3.0 Gadget Failure in QM & QXPB0 at super speed

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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.

Cc: stable@vger.kernel.org
Fixes: dce49449e0 ("usb: cdns3: allocate TX FIFO size according to composite EP number")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Frank Li 2023-05-15 12:20:53 -04:00 committed by Shawn Guo
parent 50a1726b14
commit 0f554e37da
1 changed files with 1 additions and 0 deletions
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arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi
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@ -171,6 +171,7 @@ conn_subsys: bus@5b000000 {
interrupt-names = "host", "peripheral", "otg", "wakeup";
phys = <&usb3_phy>;
phy-names = "cdns3,usb3-phy";
cdns,on-chip-buff-size = /bits/ 16 <18>;
status = "disabled";
};
};