Commit f29ab184 authored Feb 09, 2016 by Stephan Olbrich Committed by Mark Brown Feb 10, 2016

spi: bcm2835aux: disable tx fifo empty irq



The tx empty irq can be disabled when all data was copied.
This prevents unnecessary interrupts while the last bytes are sent.

Signed-off-by: Stephan Olbrich <stephanolbrich@gmx.de>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Mark Brown <broonie@kernel.org>

parent 0697ae80

drivers/spi/spi-bcm2835aux.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -212,6 +212,12 @@ static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id)
		ret = IRQ_HANDLED;
		}

		if (!bs->tx_len) {
		/* disable tx fifo empty interrupt */
		bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1] \|
		BCM2835_AUX_SPI_CNTL1_IDLE);
		}

		/* and if rx_len is 0 then wake up completion and disable spi */
		if (!bs->rx_len) {
		bcm2835aux_spi_reset_hw(bs);