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spi: pxa2xx: Prepare for edge-triggered interrupts

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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>
This commit is contained in:
Jan Kiszka 2017-01-21 10:06:38 +01:00 committed by Mark Brown
parent b03124825b
commit e51e9b9304
1 changed files with 3 additions and 0 deletions
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3
drivers/spi/spi-pxa2xx.c
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@ -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 */