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- From 7f9a454ea467bb1ee31cf77ce1c7e0aa1950d6d1 Mon Sep 17 00:00:00 2001
- From: Jan Kiszka <jan.kiszka@siemens.com>
- Date: Sat, 21 Jan 2017 10:06:38 +0100
- Subject: [PATCH 08/27] spi: pxa2xx: Prepare for edge-triggered interrupts
- Commit e51e9b93049f624c179bab2c651995bca22b5bb7 upstream.
- 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>
- ---
- drivers/spi/spi-pxa2xx.c | 3 +++
- 1 file changed, 3 insertions(+)
- diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
- index 904439fa6a00..b52faa295698 100644
- --- a/drivers/spi/spi-pxa2xx.c
- +++ b/drivers/spi/spi-pxa2xx.c
- @@ -730,6 +730,9 @@ 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->cur_msg) {
- handle_bad_msg(drv_data);
- /* Never fail */
- --
- 2.12.0
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