linux-kernel - Re: [PATCH] phy: rockchip-typec: fix tcphy_get

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Date:   Thu, 26 Jan 2023 16:41:42 +0000
From:   Lee Jones <lee@...nel.org>
To:     Neill Kapron <nkapron@...gle.com>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Chris Zhong <zyw@...k-chips.com>,
        Kever Yang <kever.yang@...k-chips.com>,
        Guenter Roeck <groeck@...omium.org>,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH] phy: rockchip-typec: fix tcphy_get_mode error case

On Thu, 26 Jan 2023, Neill Kapron wrote:

> The existing logic in tcphy_get_mode() can cause the phy to be
> incorrectly configured to USB UFP or DisplayPort mode when
> extcon_get_state returns an error code.
> 
> extcon_get_state() can return 0, 1, or a negative error code.
> 
> It is possible to get into the failing state with an extcon driver
> which does not support the extcon connector id specified as the
> second argument to extcon_get_state().
> 
> tcphy_get_mode()
> ->extcon_get_state()
> -->find_cable_index_by_id()
> --->return -EINVAL;
> 
> Fixes: e96be45cb84e ("phy: Add USB Type-C PHY driver for rk3399")
> Signed-off-by: Neill Kapron <nkapron@...gle.com>
> ---
>  drivers/phy/rockchip/phy-rockchip-typec.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Good catch.

Reviewed-by: Lee Jones <lee@...nel.org>

> diff --git a/drivers/phy/rockchip/phy-rockchip-typec.c b/drivers/phy/rockchip/phy-rockchip-typec.c
> index d76440ae10ff..6aea512e5d4e 100644
> --- a/drivers/phy/rockchip/phy-rockchip-typec.c
> +++ b/drivers/phy/rockchip/phy-rockchip-typec.c
> @@ -821,10 +821,10 @@ static int tcphy_get_mode(struct rockchip_typec_phy *tcphy)
>  	mode = MODE_DFP_USB;
>  	id = EXTCON_USB_HOST;
>  
> -	if (ufp) {
> +	if (ufp > 0) {
>  		mode = MODE_UFP_USB;
>  		id = EXTCON_USB;
> -	} else if (dp) {
> +	} else if (dp > 0) {
>  		mode = MODE_DFP_DP;
>  		id = EXTCON_DISP_DP;
>  
> -- 
> 2.39.1.456.gfc5497dd1b-goog

-- 
Lee Jones [李琼斯]