[PATCH] gpio: mvebu: Fix cause computation in irq handler

Hi Linus,
 
 On lun., juil. 24 2017, Gregory CLEMENT [off-list ref] wrote:

Hi Linus,
 
 On mer., juil. 12 2017, Gregory CLEMENT [off-list ref] wrote:

quoted

When switching to regmap, the way to compute the irq cause was
reorganized. However while doing it, a typo was introduced: a 'xor'
replaced a 'and'.

This lead to wrong behavior in the interrupt handler ans one of the
symptom was wrong irq handler called on the Armada 388 GP:
"->handle_irq():  c016303c,
handle_bad_irq+0x0/0x278
->irq_data.chip(): c0b0ec0c,
0xc0b0ec0c
->action():   (null)
   IRQ_NOPROBE set
 IRQ_NOREQUEST set
unexpected IRQ trap at vector 00
irq 0, desc: ee804800, depth: 1, count: 0, unhandled: 0"

Fixes: 2233bf7a92e7 ("gpio: mvebu: switch to regmap for register access")
Signed-off-by: Gregory CLEMENT <redacted>

Would it be possible to push this fix on the current kernel (v4.13-rc) ?

Indeed currently due to this bug, the Armada 388 GP board does not boot
anymore because this board uses a gpio interrupt. So it prevents to have
continuous integration on this one with kci for instance.

I saw that yesterday you appplied patches on gpio/fixes but it seems
that you missed this one, because most of the patch you're applied were
actually posted after this one.

Thanks,

Gregory

quoted

---
 drivers/gpio/gpio-mvebu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index e338c3743562..45c65f805fd6 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c

@@ -557,7 +557,7 @@ static void mvebu_gpio_irq_handler(struct irq_desc *desc)
 	edge_cause = mvebu_gpio_read_edge_cause(mvchip);
 	edge_mask  = mvebu_gpio_read_edge_mask(mvchip);
 
-	cause = (data_in ^ level_mask) | (edge_cause & edge_mask);
+	cause = (data_in & level_mask) | (edge_cause & edge_mask);
 
 	for (i = 0; i < mvchip->chip.ngpio; i++) {
 		int irq;

-- 
2.13.2

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

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-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com