From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Hongbo Yao <andy.xu@hj-micro.com>
Cc: andriy.shevchenko@linux.intel.com, andi.shyti@kernel.org,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
peter.du@hj-micro.com, gwilym.wu@hj-micro.com,
clarke.li@hj-micro.com
Subject: Re: [PATCH] i2c: designware: Enable interrupt mask workaround for HJMC3001
Date: Wed, 26 Aug 2026 12:12:57 +0200 [thread overview]
Message-ID: <20260826101257.GN893316@black.igk.intel.com> (raw)
In-Reply-To: <20260826070547.268672-1-andy.xu@hj-micro.com>
On Wed, Aug 26, 2026 at 03:05:47PM +0800, Hongbo Yao wrote:
> On HJMicro ARM64 servers, the DesignWare I2C controller does not
> retrigger a pending interrupt if the interrupt status changes after
> the current status bits have been cleared.
>
> The issue is exposed under heavy system load when the corresponding
> SPI is routed across sockets to a core in the remote socket. The
> interrupt is then lost and the I2C transfer times out.
>
> Enable ACCESS_INTR_MASK for HJMC3001. This toggles DW_IC_INTR_MASK
> before returning from the interrupt handler and retriggers any
> pending interrupt.
>
> Fixes: 6816ce57c479 ("i2c: designware: Add a new ACPI HID for HJMC01 I2C controller")
> Signed-off-by: Hongbo Yao <andy.xu@hj-micro.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
prev parent reply other threads:[~2026-08-26 10:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-26 7:05 [PATCH] i2c: designware: Enable interrupt mask workaround for HJMC3001 Hongbo Yao
2026-08-26 10:12 ` Mika Westerberg [this message]
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