[PATCH 2/4] spi: bcm2835aux: disable tx fifo empty irq
From: stephanolbrich at gmx.de <hidden>
Date: 2016-02-09 18:10:33
Also in:
linux-spi
Subsystem:
spi subsystem, the rest · Maintainers:
Mark Brown, Linus Torvalds
From: Stephan Olbrich <redacted> 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 <redacted> --- drivers/spi/spi-bcm2835aux.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c
index ecc73c0..d2f0067 100644
--- a/drivers/spi/spi-bcm2835aux.c
+++ b/drivers/spi/spi-bcm2835aux.c@@ -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);
--
2.5.0