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!. Best, Markus
