linux-kernel - Re: [PATCH] usb: typec: ucsi: don't print PPM init deferred errors

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Date:   Thu, 13 Apr 2023 09:22:15 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH] usb: typec: ucsi: don't print PPM init deferred errors

On Wed, Apr 12, 2023 at 06:17:34PM +0200, Fabrice Gasnier wrote:
> ucsi_init() may be deferred as usb_role_sw may be deferred in
> ucsi_register_port(). This results in several PPM init failed (-517)
> messages maybe printed several times upon boot, like on stm32mp135f-dk
> board, until the role_switch driver gets probed.
> 
> [   19.880945] dwc2 49000000.usb: supply vusb_d not found, using dummy regulator
> [   19.887136] dwc2 49000000.usb: supply vusb_a not found, using dummy regulator
> [   19.975432] ucsi-stm32g0-i2c 0-0053: PPM init failed (-517)
> [   20.155746] dwc2 49000000.usb: EPs: 9, dedicated fifos, 952 entries in SPRAM
> [   20.175429] ucsi-stm32g0-i2c 0-0053: PPM init failed (-517)
> [   20.184242] dwc2 49000000.usb: DWC OTG Controller
> 
> Adopt dev_err_probe() instead of dev_err(), to only print other errors.
> Also print an error in case the wait count has expired.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/ucsi/ucsi.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index f632350f6dcb..4d809e0d7761 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1447,11 +1447,13 @@ static void ucsi_init_work(struct work_struct *work)
>  
>  	ret = ucsi_init(ucsi);
>  	if (ret)
> -		dev_err(ucsi->dev, "PPM init failed (%d)\n", ret);
> +		dev_err_probe(ucsi->dev, ret, "PPM init failed\n");
>  
>  	if (ret == -EPROBE_DEFER) {
> -		if (ucsi->work_count++ > UCSI_ROLE_SWITCH_WAIT_COUNT)
> +		if (ucsi->work_count++ > UCSI_ROLE_SWITCH_WAIT_COUNT) {
> +			dev_err(ucsi->dev, "PPM init failed, stop trying\n");
>  			return;
> +		}
>  
>  		queue_delayed_work(system_long_wq, &ucsi->work,
>  				   UCSI_ROLE_SWITCH_INTERVAL);
> -- 
> 2.25.1

-- 
heikki