linux-kernel - Re: [PATCH v2] phy: rockchip-inno-usb2: Return zero after otg sync

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Date:   Wed, 24 Aug 2022 07:33:10 +0200
From:   Michael Riesch <michael.riesch@...fvision.net>
To:     Peter Geis <pgwipeout@...il.com>, Heiko Stuebner <heiko@...ech.de>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Samuel Holland <samuel@...lland.org>
Cc:     Markus Reichl <m.reichl@...etechno.de>,
        linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] phy: rockchip-inno-usb2: Return zero after otg sync

Hi Peter,

On 8/23/22 16:47, Peter Geis wrote:
> The otg sync state patch reuses the ret variable, but fails to set it to
> zero after use. This leads to a situation when the otg port is in
> peripheral mode where the otg phy aborts halfway through setup.  It also
> fails to account for a failure to register the extcon notifier. Fix this
> by using our own variable and skipping otg sync in case of failure.
> 
> Fixes: 8dc60f8da22f ("phy: rockchip-inno-usb2: Sync initial otg state")
> 
> Reported-by: Markus Reichl <m.reichl@...etechno.de>
> Reported-by: Michael Riesch <michael.riesch@...fvision.net>
> Signed-off-by: Peter Geis <pgwipeout@...il.com>
> Tested-by: Michael Riesch <michael.riesch@...fvision.net>
> Tested-by: Markus Reichl <m.reichl@...etechno.de>
> ---
>  drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> index 0b1e9337ee8e..d579a22c61df 100644
> --- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> +++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> @@ -1124,7 +1124,7 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy,
>  					  struct rockchip_usb2phy_port *rport,
>  					  struct device_node *child_np)
>  {
> -	int ret;
> +	int ret, id;
>  
>  	rport->port_id = USB2PHY_PORT_OTG;
>  	rport->port_cfg = &rphy->phy_cfg->port_cfgs[USB2PHY_PORT_OTG];
> @@ -1164,11 +1164,12 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy,
>  					EXTCON_USB_HOST, &rport->event_nb);
>  		if (ret)

This needs braces, right?

	if (ret) {
>  			dev_err(rphy->dev, "register USB HOST notifier failed\n");
> +			goto out;

	}

With the braces the patch works as expected.

Thanks and best regards,
Michael

>  
>  		if (!of_property_read_bool(rphy->dev->of_node, "extcon")) {
>  			/* do initial sync of usb state */
> -			ret = property_enabled(rphy->grf, &rport->port_cfg->utmi_id);
> -			extcon_set_state_sync(rphy->edev, EXTCON_USB_HOST, !ret);
> +			id = property_enabled(rphy->grf, &rport->port_cfg->utmi_id);
> +			extcon_set_state_sync(rphy->edev, EXTCON_USB_HOST, !id);
>  		}
>  	}
>