linux-kernel - Re: [PATCH] usb: typec: ucsi: treat get_pdos not supported condition as info instead of error

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Date: Wed, 5 Jun 2024 02:45:15 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc: heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org, 
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: typec: ucsi: treat get_pdos not supported condition
 as info instead of error

On Tue, Jun 04, 2024 at 03:40:44PM -0400, Mark Pearson wrote:
> On systems where the UCSI PDOs are not supported, the UCSI driver is
> giving an error message. This can cause users to believe there is a HW
> issue with their system when in fact it is working as designed.
> 
> Downgrade message to dev_info for EOPNOTSUPP condition.
> 
> Tested on Lenovo L14 G5 AMD and confirmed with Lenovo FW team that PDOs
> are not supported on this platform.
> 
> Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> ---
>  drivers/usb/typec/ucsi/ucsi.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index cb52e7b0a2c5..090be87d5485 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -632,8 +632,12 @@ static int ucsi_read_pdos(struct ucsi_connector *con,
>  	command |= is_source(role) ? UCSI_GET_PDOS_SRC_PDOS : 0;
>  	ret = ucsi_send_command(ucsi, command, pdos + offset,
>  				num_pdos * sizeof(u32));
> -	if (ret < 0 && ret != -ETIMEDOUT)
> -		dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret);
> +	if (ret < 0 && ret != -ETIMEDOUT) {
> +		if (ret == -EOPNOTSUPP)
> +			dev_info(ucsi->dev, "UCSI_GET_PDOS not supported on this hardware\n");

Maybe it would be enough to guard GET_PDOS commands with the
UCSI_CAP_PDO_DETAILS check? Is it cleared on affected platforms?

> +		else
> +			dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret);
> +	}
>  
>  	return ret;
>  }
> -- 
> 2.45.1
> 

-- 
With best wishes
Dmitry