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