]> git.karo-electronics.de Git - linux-beck.git/commit
spi: bcm2835: fill FIFO before enabling interrupts to reduce interrupts/message
authorMartin Sperl <kernel@martin.sperl.org>
Sun, 29 Mar 2015 14:03:25 +0000 (16:03 +0200)
committerMark Brown <broonie@kernel.org>
Sun, 29 Mar 2015 16:53:30 +0000 (09:53 -0700)
commite3a2be3030e2fec27a2577d3c52203da090a4366
tree91d1180ee0742a9403c2448cd1ceb5d1d967653c
parent1e4df62d46fa45109123f2b265b2d8146031db16
spi: bcm2835: fill FIFO before enabling interrupts to reduce interrupts/message

To reduce the number of interrupts/message we fill the FIFO before
enabling interrupts - for short messages this reduces the interrupt count
from 2 to 1 interrupt.

There have been rare cases where short (<200ns) chip-select switches with
native CS have been observed during such operation, this is why this
optimization is only enabled for GPIO-CS.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Tested-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/spi/spi-bcm2835.c