Hello linux-omap community, I am an open source enthusiast and I am trying to modify omap4 mcspi drivers in order to use interrupts instead of polling. I use beaglebone black. After I set CS active and enable channel 0 and interrupts, I receive only two interrupts (in fact a pair): - tx0_empty and after this I fill the tx buffer by writing in the mcspi tx reg n-times and then reset the flag in IRQSTATUS - as a follow up to the actions taken for tx0_empty, rx0_full interrupt is risen and I read the mcspi rx reg n-times and reset the flag in IRQSTATUS. After that no interrupt comes (neither of tx_empty, rx_full or EOT) even if interrupts and channel0 are enabled and CS is active, so I can not transfer remaining data. FIFO is enabled and OMAP2_MCSPI_XFERLEVEL is setup accordingly to transfer size. Note that if I want to transfer a message that needs only one pair of interrupts, then EOT interrupt comes, which is the expected behavior. If I use the polling method to see if something is pending on channel0 everything works well, but need to use interrupts because I want to port this driver to Xenomai real-time linux. The dts for spi0 and spi1 is not changed. Any ideas? Did anybody successfully used interrupts (not dma) on omap4 mcspi? Thank you and kind regards, L-C. Duca
