linux-kernel - Re: [PATCH] platform/chrome: cros_ec_typec: Tolerate unrecognized mux flags

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Message-ID: <20201117190950.GC1819103@google.com>
Date:   Tue, 17 Nov 2020 11:09:50 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, heikki.krogerus@...ux.intel.com
Cc:     Keith Short <keithshort@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH] platform/chrome: cros_ec_typec: Tolerate unrecognized
 mux flags

Including Heikki, who I forgot to add in the original patch email.

On Thu, Nov 05, 2020 at 06:03:05PM -0800, Prashant Malani wrote:
> On occasion, the Chrome Embedded Controller (EC) can send a mux
> configuration which doesn't map to a particular data mode. For instance,
> dedicated Type C chargers, when connected, may cause only
> USB_PD_MUX_POLARITY_INVERTED to be set. This is a valid flag combination
> and should not lead to a driver abort.
> 
> Modify the mux configuration handling to not return an error when an
> unrecognized mux flag combination is encountered. Concordantly, make the
> ensuing print a debug level print so as to not pollute the kernel logs.
> 
> Cc: Keith Short <keithshort@...omium.org>
> Signed-off-by: Prashant Malani <pmalani@...omium.org>
> ---
>  drivers/platform/chrome/cros_ec_typec.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index ce031a10eb1b..5b8db02ab84a 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -537,10 +537,9 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
>  		port->state.mode = TYPEC_STATE_USB;
>  		ret = typec_mux_set(port->mux, &port->state);
>  	} else {
> -		dev_info(typec->dev,
> -			 "Unsupported mode requested, mux flags: %x\n",
> -			 mux_flags);
> -		ret = -ENOTSUPP;
> +		dev_dbg(typec->dev,
> +			"Unrecognized mode requested, mux flags: %x\n",
> +			mux_flags);
>  	}
>  
>  	return ret;
> -- 
> 2.29.1.341.ge80a0c044ae-goog
>