Commit e51e9b93 authored Jan 21, 2017 by Jan Kiszka Committed by Mark Brown Jan 23, 2017

spi: pxa2xx: Prepare for edge-triggered interrupts



When using the a device with edge-triggered interrupts, such as MSIs,
the interrupt handler has to ensure that there is a point in time during
its execution where all interrupts sources are silent so that a new
event can trigger a new interrupt again.

This is achieved here by disabling all interrupt sources for a moment
before processing them according to the status register. If a new
interrupt should have arrived after we read the status, it will now
re-trigger the interrupt, even in edge mode.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>

parent b0312482

drivers/spi/spi-pxa2xx.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -785,6 +785,9 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
		if (!(status & mask))
		return IRQ_NONE;

		pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg & ~drv_data->int_cr1);
		pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg);

		if (!drv_data->master->cur_msg) {
		handle_bad_msg(drv_data);
		/* Never fail */