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[07/11] i2c: designware: Do not process interrupt when device is suspended

Message ID 20221026123912.2833271-8-jarkko.nikula@linux.intel.com
State Superseded
Headers show
Series i2c: designware: Slave fixes and generic cleanups | expand

Commit Message

Jarkko Nikula Oct. 26, 2022, 12:39 p.m. UTC
Do not return with interrupt handled if host controller is off and thus
interrupt is originating from other device or is spurious.

Add a check to detect when controller is runtime suspended or
transitioning/reset. In latter case all raw interrupt status register
bits may read one. In both cases return IRQ_NONE to indicate interrupt
was not from this device.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
---
 drivers/i2c/busses/i2c-designware-master.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 1b7db2b58f31..dce74f8ab171 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -778,6 +778,8 @@  static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
 	dev_dbg(dev->dev, "enabled=%#x stat=%#x\n", enabled, stat);
 	if (!enabled || !(stat & ~DW_IC_INTR_ACTIVITY))
 		return IRQ_NONE;
+	if (pm_runtime_suspended(dev->dev) || stat == ~0)
+		return IRQ_NONE;
 
 	i2c_dw_irq_handler_master(dev);