From e51e9b93049f624c179bab2c651995bca22b5bb7 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Sat, 21 Jan 2017 10:06:38 +0100 Subject: 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 Acked-by: Robert Jarzmik Signed-off-by: Mark Brown --- drivers/spi/spi-pxa2xx.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers') 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 */ -- cgit v1.2.3