linux-kernel - [PATCH 0/1] i2c: designware: Fix SMBUS Master interrupts storms

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Message-Id: <20251011073057.2959-1-guojinhui.liam@bytedance.com>
Date: Sat, 11 Oct 2025 15:30:56 +0800
From: Jinhui Guo <guojinhui.liam@...edance.com>
To: mika.westerberg@...ux.intel.com,
	andriy.shevchenko@...ux.intel.com,
	jsd@...ihalf.com,
	andi.shyti@...nel.org
Cc: guojinhui.liam@...edance.com,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/1] i2c: designware: Fix SMBUS Master interrupts storms 

Hi all,

We hit interrupt storms on the SMBus master extend-clock timeout IRQ
because broken firmware left IC_SMBUS=1 while the driver IRQ handler
never services SMBus events.

Since we cannot disable IC_SMBUS directly, mask its interrupts to
prevent floods and make the driver more robust.

Thanks,
Jinhui

---
Jinhui Guo (1):
  i2c: designware: Disable SMBus interrupts to prevent storms from
    mis-configured firmware

 drivers/i2c/busses/i2c-designware-core.h   |  1 +
 drivers/i2c/busses/i2c-designware-master.c | 11 +++++++++++
 2 files changed, 12 insertions(+)

-- 
2.20.1