Dmas property of spi@c260000 in Jetpack 6

[kcs]

Hi nvidia teams.
questions have not been fully resolved yet.

From what I found on the forums, I confirmed that several users also experience issues when sending more than 256 bytes of data through the spi@c260000 interface.

Orin SPI2 in jekpack 6.0, can not work

If the issue is specific to sending packet size > 256 Bytes, please modify the following line in your device tree to check if it could help. spi@c260000 { compatible = "nvidia,tegra210-spi"; reg = <0x00 0xc260000 0x00 0x1000>; interrupts = <0x00 0x25 0x04>; #address-cells = <0x01>; #size-cells = <0x00>; clocks = <0x04 0x88>; clock-names = "spi"; iommus = <0x05 0x04>; assigned-clocks = <0x04 0x88>; assigned-clock-parents = <0x04 0x66>; resets = <0x04 0x5c>; …

Is the spi driver still being optimized?

I’m wondering why changing the value to 16, like in Jetpack 5, can send data up to 4096 bytes on spi@c260000, like other SPI interfaces.
Also I wonder whether changing it to 16 is the correct approach. (there is a reason why it was changed to 19 when updating to Jetpack 6.x)

Thanks