From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Date: Mon, 7 Nov 2022 13:42:43 +0000 (+0200)
Subject: i2c: designware: Do not process interrupt when device is suspended
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=cdbd2f169bf1aff9f679a3e07d62244fc4341968;p=linux.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 <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
---

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 1b7db2b58f311..d6fcf955dfc0b 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);