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

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Date:   Sat, 13 May 2023 11:46:24 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Frank Li <Frank.Li@....com>
Cc:     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>,
        Peter Chen <peter.chen@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>, pawell@...ence.com,
        imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] arm64: dts: imx8: fix USB 3.0 Gadget Failure in QM &
 QXPB0 at super speed

On Thu, Apr 13, 2023 at 11:50:43AM -0400, Frank Li wrote:
> 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>

There are a couple of check patch warnings on commit log.

WARNING: Possible unwrapped commit description (prefer a maximum 75 chars per line)
#7: 
Resolve USB 3.0 gadget failure for QM and QXPB0 in super speed mode with single

WARNING: Please use correct Fixes: style 'Fixes: <12 chars of sha1> ("<title line>")' - ie: 'Fixes: dce49449e04f ("usb: cdns3: allocate TX FIFO size according to composite EP number")'
#13: 
Fixes: dce49449e04ff ("usb: cdns3: allocate TX FIFO size according to composite EP number")

> ---
>  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>;

The property is defined as uint32 in the bindings.  Not sure why we
need to enforce 16-bits here.

Shawn

>  			status = "disabled";
>  		};
>  	};
> -- 
> 2.34.1
>