From: Jarkko Nikula Date: Mon, 7 Nov 2022 13:42:43 +0000 (+0200) Subject: i2c: designware: Do not process interrupt when device is suspended X-Git-Tag: v6.6.17~5908^2~27 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cdbd2f169bf1aff9f679a3e07d62244fc4341968;p=platform%2Fkernel%2Flinux-rpi.git 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 Reviewed-by: Andy Shevchenko Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c index 1b7db2b..d6fcf95 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 == GENMASK(31, 0)) + return IRQ_NONE; i2c_dw_irq_handler_master(dev);