The SPI driver should, if possible, use as large buffer as possible. Currently, only xfer3 is adhering to the requested max blk size specified in /sys/module/spidev/parameters/bufsiz but is sending it in chunks. For all other xfer functions, the block size is limited to 4096.
I believe that xfer3 was introduced to fix this, however, it is still limited to 4096 chunks.
This PR aims to clarify xfer3 behavior and allow for arbitrary xfer buffer size.
The SPI driver should, if possible, use as large buffer as possible. Currently, only
xfer3is adhering to the requested max blk size specified in/sys/module/spidev/parameters/bufsizbut is sending it in chunks. For all otherxferfunctions, the block size is limited to 4096.I believe that
xfer3was introduced to fix this, however, it is still limited to 4096 chunks.This PR aims to clarify
xfer3behavior and allow for arbitrary xfer buffer size.