Commit cdbd2f16 authored by Jarkko Nikula's avatar Jarkko Nikula Committed by Wolfram Sang
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i2c: designware: Do not process interrupt when device is suspended 



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: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@kernel.org>
parent 4c7107c2

drivers/i2c/busses/i2c-designware-master.c

+2 −0
Original line number Diff line number Diff line
@@ -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 == GENMASK(31, 0))

		return IRQ_NONE;



	i2c_dw_irq_handler_master(dev);