linux-kernel - Re: [PATCH 2/2] usb: core: Try generic PHY_MODE_USB_HOST if usb_phy_roothub_set

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Date:   Fri, 22 Mar 2019 13:56:19 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Chen-Yu Tsai <wens@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kishon Vijay Abraham I <kishon@...com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>
Subject: Re: [PATCH 2/2] usb: core: Try generic PHY_MODE_USB_HOST if
 usb_phy_roothub_set_mode fails

On 22/03/2019 09:51, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@...e.org>
> 
> Some PHYs do not support PHY_MODE_USB_HOST_SS, i.e. USB 3.0 or higher.
> Fall back and try the more generic PHY_MODE_USB_HOST if it fails.
> 
> Fixes: b97a31348379 ("usb: core: comply to PHY framework")
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  drivers/usb/core/hcd.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 3189181bb628..975d7c1288e3 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -2741,6 +2741,9 @@ int usb_add_hcd(struct usb_hcd *hcd,
>  
>  		retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
>  						  PHY_MODE_USB_HOST_SS);
> +		if (retval)
> +			retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
> +							  PHY_MODE_USB_HOST);
>  		if (retval)
>  			goto err_usb_phy_roothub_power_on;
>  
> 

Tested-by: Neil Armstrong <narmstrong@...libre.com>

This fixes USB on Amlogic GXL/GXL, tested on a Nexbox A1 with a S912 SoC running v5.1-rc1

Error was :
[    4.851477] phy phy-d0078080.phy.3: unsupported PHY mode 5
[    4.856266] xhci-hcd: probe of xhci-hcd.0.auto failed with error -22

Neil