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spi: bcm2835aux: disable tx fifo empty irq

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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>
This commit is contained in:
Stephan Olbrich 2016-02-09 19:10:33 +01:00 committed by Mark Brown
parent 0697ae80fe
commit f29ab1845f
1 changed files with 6 additions and 0 deletions
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6
drivers/spi/spi-bcm2835aux.c
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@ -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);