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authorJan Kiszka <jan.kiszka@siemens.com>2017-01-21 10:06:38 +0100
committerMark Brown <broonie@kernel.org>2017-01-23 18:09:37 +0000
commite51e9b93049f624c179bab2c651995bca22b5bb7 (patch)
tree7cd7caa4b362e99b5e4335a5e5c7897b754e47d9 /drivers/spi
parentb03124825b8612bf371e5b4ccc2cd812ed3c2dbb (diff)
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-pxa2xx.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 8c65bc1823f3..06ade434c083 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -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 */