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Diffstat (limited to 'drivers/pinctrl/pinctrl-mcp23s08.c')
-rw-r--r--drivers/pinctrl/pinctrl-mcp23s08.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
index 4551575e4..38c3a14c8 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c
@@ -375,7 +375,8 @@ mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
static irqreturn_t mcp23s08_irq(int irq, void *data)
{
struct mcp23s08 *mcp = data;
- int intcap, intcon, intf, i, gpio, gpio_orig, intcap_mask, defval;
+ int intcap, intcon, intf, i, gpio, gpio_orig, intcap_mask, defval, gpinten;
+ unsigned long int enabled_interrupts;
unsigned int child_irq;
bool intf_set, intcap_changed, gpio_bit_changed,
defval_changed, gpio_set;
@@ -395,6 +396,9 @@ static irqreturn_t mcp23s08_irq(int irq, void *data)
if (mcp_read(mcp, MCP_INTCON, &intcon))
goto unlock;
+ if (mcp_read(mcp, MCP_GPINTEN, &gpinten))
+ goto unlock;
+
if (mcp_read(mcp, MCP_DEFVAL, &defval))
goto unlock;
@@ -410,9 +414,12 @@ static irqreturn_t mcp23s08_irq(int irq, void *data)
"intcap 0x%04X intf 0x%04X gpio_orig 0x%04X gpio 0x%04X\n",
intcap, intf, gpio_orig, gpio);
- for (i = 0; i < mcp->chip.ngpio; i++) {
- /* We must check all of the inputs on the chip,
- * otherwise we may not notice a change on >=2 pins.
+ enabled_interrupts = gpinten;
+ for_each_set_bit(i, &enabled_interrupts, mcp->chip.ngpio) {
+ /*
+ * We must check all of the inputs with enabled interrupts
+ * on the chip, otherwise we may not notice a change
+ * on more than one pin.
*
* On at least the mcp23s17, INTCAP is only updated
* one byte at a time(INTCAPA and INTCAPB are