linux-kernel - Re: [PATCH V2] accel/amdxdna: Check interrupt register before mailbox_rx

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Message-ID: <8ce9306a-fdee-4a6a-b4da-87e00e807a37@amd.com>
Date: Thu, 27 Feb 2025 09:00:32 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
 Lizhi Hou <lizhi.hou@....com>, ogabbay@...nel.org, quic_jhugo@...cinc.com,
 dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, min.ma@....com, max.zhen@....com,
 sonal.santan@....com, king.tam@....com
Subject: Re: [PATCH V2] accel/amdxdna: Check interrupt register before
 mailbox_rx_worker exits

On 2/27/2025 02:36, Jacek Lawrynowicz wrote:
> Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>
> 
> On 2/26/2025 5:18 PM, Lizhi Hou wrote:
>> There is a timeout failure been found during stress tests. If the firmware
>> generates a mailbox response right after driver clears the mailbox channel
>> interrupt register, the hardware will not generate an interrupt for the
>> response. This causes the unexpected mailbox command timeout.
>>
>> To handle this failure, driver checks the interrupt register before
>> exiting mailbox_rx_worker(). If there is a new response, driver goes back
>> to process it.
>>
>> Signed-off-by: Lizhi Hou <lizhi.hou@....com>
>> ---

Applied to drm-misc-next.

cd740b873f8f6 accel/amdxdna: Check interrupt register before 
mailbox_rx_worker exits