linux-kernel - Re: [PATCH v2] can: mcan: Add support for handling DLEC error on CAN FD

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Date:   Fri, 14 Oct 2022 13:36:03 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vivek Yadav <vivek.2311@...sung.com>
Cc:     rcsekar@...sung.com, wg@...ndegger.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        pankaj.dubey@...sung.com, ravi.patel@...sung.com,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] can: mcan: Add support for handling DLEC error on CAN
 FD

On 14.10.2022 16:53:19, Vivek Yadav wrote:
> > 
> >                 if (is_lec_err(lec))
> >                         work_done += m_can_handle_lec_err(dev, lec);
> > 
> >                 if (is_lec_err(dlec))
> >                         work_done += m_can_handle_lec_err(dev, dlec);
> > 
> > > +			u8 dlec = FIELD_GET(PSR_DLEC_MASK, psr);
> > > +
> > > +			if (is_lec_err(dlec)) {
> > > +				netdev_dbg(dev, "Data phase error
> > detected\n");
> > 
> > If you add a debug, please add one for the Arbitration phase, too.
>
> I have added the debug print specially for dlec (data phase). So we
> can differentiate lec errors (for all type of frames except FD with
> BRS) and Data phase errors, as we are calling same handler function
> for both the errors.
> 
> If I understood your comment correctly, you are asking something like below:
>         /* handle protocol errors in arbitration phase */
>         if ((cdev->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) &&
> -           m_can_is_protocol_err(irqstatus))
> +           m_can_is_protocol_err(irqstatus)) {
> +               netdev_dbg(dev, "Arbitration phase error detected\n");
>                 work_done += m_can_handle_protocol_error(dev, irqstatus);
> +       }
> 
> If the above implementation is correct as per your review comment, I
> think we don't need the above changes because Debug print for
> arbitration failure are already there in "
> m_can_handle_protocol_error" function.

Ok

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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