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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: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Jarkko Nikula 2022-11-07 15:42:43 +02:00 committed by Wolfram Sang
parent 4c7107c297
commit cdbd2f169b
1 changed files with 2 additions and 0 deletions
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2
drivers/i2c/busses/i2c-designware-master.c
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@ -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);