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>
diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c
index 7de6f84..e1b2fec 100644
--- a/drivers/spi/spi-bcm2835aux.c
+++ b/drivers/spi/spi-bcm2835aux.c
@@ -212,6 +212,12 @@
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);