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| author |   Jan Kiszka <jan.kiszka@siemens.com> | 2017-01-21 10:06:38 +0100 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2017-01-23 18:09:37 +0000 |
| commit | e51e9b93049f624c179bab2c651995bca22b5bb7 (patch) | |
| tree | 7cd7caa4b362e99b5e4335a5e5c7897b754e47d9 /drivers/spi | |
| parent | spi: pxa2xx: Factor out handle_bad_msg (diff) | |
| download | linux-dev-e51e9b93049f624c179bab2c651995bca22b5bb7.tar.xz linux-dev-e51e9b93049f624c179bab2c651995bca22b5bb7.zip | |
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.c | 3 |
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 */ |