linux-kernel - Re: [PATCH] drm/bridge: dw-hdmi-qp: Fix spurious IRQ on resume

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Message-ID: <7291eff3-b259-4209-b150-cb220abc01ec@collabora.com>
Date: Wed, 15 Oct 2025 13:03:07 +0300
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Sebastian Reichel <sebastian.reichel@...labora.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Sandy Huang <hjc@...k-chips.com>, Heiko Stübner
 <heiko@...ech.de>, Andy Yan <andy.yan@...k-chips.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-rockchip@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH] drm/bridge: dw-hdmi-qp: Fix spurious IRQ on resume

On 10/14/25 7:00 PM, Sebastian Reichel wrote:
> After resume from suspend to RAM, the following splash is generated if
> the HDMI driver is probed (independent of a connected cable):
> 
> [ 1194.484052] irq 80: nobody cared (try booting with the "irqpoll" option)
> [ 1194.484074] CPU: 0 UID: 0 PID: 627 Comm: rtcwake Not tainted 6.17.0-rc7-g96f1a11414b3 #1 PREEMPT
> [ 1194.484082] Hardware name: Rockchip RK3576 EVB V10 Board (DT)
> [ 1194.484085] Call trace:
> [ 1194.484087]  ... (stripped)
> [ 1194.484283] handlers:
> [ 1194.484285] [<00000000bc363dcb>] dw_hdmi_qp_main_hardirq [dw_hdmi_qp]
> [ 1194.484302] Disabling IRQ #80
> 
> Apparently the HDMI IP is losing part of its state while the system
> is suspended and generates spurious interrupts during resume. The
> bug has not yet been noticed, as system suspend does not yet work
> properly on upstream kernel with either the Rockchip RK3588 or RK3576
> platform.
> 
> Fixes: 128a9bf8ace2 ("drm/rockchip: Add basic RK3588 HDMI output support")
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>

LGTM, hence

Reviewed-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>