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SubjectRe: [PATCH 02/15] can: m_can: Wakeup net queue once tx was issued
Hi Marc,

On Wed, Nov 30, 2022 at 06:21:00PM +0100, Marc Kleine-Budde wrote:
> On 16.11.2022 21:52:55, Markus Schneider-Pargmann wrote:
> > Currently the driver waits to wakeup the queue until the interrupt for
> > the transmit event is received and acknowledged. If we want to use the
> > hardware FIFO, this is too late.
> >
> > Instead release the queue as soon as the transmit was transferred into
> > the hardware FIFO. We are then ready for the next transmit to be
> > transferred.
> If you want to really speed up the TX path, remove the worker and use
> the spi_async() API from the xmit callback, see mcp251xfd_start_xmit().

Good idea. I will check how regmap's async_write works and if it is
suitable to do the job. I don't want to drop the regmap usage for this
right now.

> Extra bonus if you implement xmit_more() and transfer more than 1 skb
> per SPI transfer.

That's on my todo list, but I am not sure I will get to it soonish.

Thank you Marc!.


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