linux-kernel - Re: [PATCH 0/6] Add Microchip MCP25XXFD CAN driver

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Date:   Mon, 22 Jun 2020 15:26:08 +0200
From:   Kurt Van Dijck <dev.kurt@...dijck-laurijssen.be>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        wg@...ndegger.com, kernel@...tin.sperl.org,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] Add Microchip MCP25XXFD CAN driver

On ma, 22 jun 2020 14:54:15 +0200, Marc Kleine-Budde wrote:
> On 6/22/20 2:43 PM, Kurt Van Dijck wrote:
> > I get RX-0: FIFO overflows in listen-only mode (back-to-back burst of
> > the single other node).
> 
> Single other node? Who's ACKing the CAN frames?

hence the back-to-back burst.

> 
> > The SPI peripheral does not use DMA :-(.
> 
> The SPI messages are quite small, so DMA wont help either. Getting rid of the
> IRQ and polling for completion is the way to go.
> 
> > Do you have, by accident, some freescale SPI fixes lying around?
> 
> nope
> 
> > It's not the biggest problem on my side, but is proves the system not
> > being guarded against load.
> 
> Do you have freq scaling activated?

Not yet.

The device tree needs upgrading ... grrr

> 
> Marc
> 
> -- 
> Pengutronix e.K.                 | Marc Kleine-Budde           |
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