misc: rp1-pio: Include maxburst in PIO_DMACTRL#7441
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The PIO DMA interface exposes empty/not empty signals as well as the threshold signals required for bursts. If the FIFO is not ready for a burst, a single beat burst can still be performed. It is therefore safe to set the PIO FIFO thresholds to the burst size used by the DMA controller. See: https://forums.raspberrypi.com/viewtopic.php?t=398882 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Fail transfers if they haven't first been configured. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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The PIO DMA interface exposes empty/not empty signals as well as the threshold signals required for bursts. If the FIFO is not ready for a burst, a single beat burst can still be performed.
It is therefore safe to set the PIO FIFO thresholds to the burst size used by the DMA controller.
See: https://forums.raspberrypi.com/viewtopic.php?t=398882