On Wed, 16 Nov 2022 17:49:30 +0100, Marc Kleine-Budde wrote:
The SPI framework checks for each transfer (with the struct spi_controller::can_dma callback) whether the driver wants to use DMA for the transfer. If the driver returns true, the SPI framework will map the transfer's data to the device, start the actual transfer and map the data back.
In commit 07e759387788 ("spi: spi-imx: add PIO polling support") the spi-imx driver's spi_imx_transfer_one() function was extended. If the estimated duration of a transfer does not exceed a configurable duration, a polling transfer function is used. This check happens before checking if the driver decided earlier for a DMA transfer.
[...]
Applied to
broonie/spi.git for-next
Thanks!
[1/1] spi: spi-imx: spi_imx_transfer_one(): check for DMA transfer first commit: e85e9e0d8cb759013d6474011c227f92e442d746
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
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Thanks, Mark