Commit e51e9b93 authored by Jan Kiszka's avatar Jan Kiszka Committed by Mark Brown

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: default avatarJan Kiszka <jan.kiszka@siemens.com>
Acked-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent b0312482
......@@ -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 */
......
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