linux-kernel - Re: [PATCH v3] drm/bridge: cdns-dsi: Replace deprecated UNIVERSAL_DEV_PM

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Message-ID: <20260112092738.GA120199@francesco-nb>
Date: Mon, 12 Jan 2026 10:27:38 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Vitor Soares <ivitro@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: 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>,
	Vitor Soares <vitor.soares@...adex.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Aradhya Bhatia <aradhya.bhatia@...ux.dev>,
	Jayesh Choudhary <j-choudhary@...com>, stable@...r.kernel.org
Subject: Re: [PATCH v3] drm/bridge: cdns-dsi: Replace deprecated
 UNIVERSAL_DEV_PM_OPS()

Hello Maarten, Maxime, Thomas, Simona, David,

On Mon, May 12, 2025 at 09:32:15AM +0100, Vitor Soares wrote:
> From: Vitor Soares <vitor.soares@...adex.com>
> 
> The deprecated UNIVERSAL_DEV_PM_OPS() macro uses the provided callbacks
> for both runtime PM and system sleep. This causes the DSI clocks to be
> disabled twice: once during runtime suspend and again during system
> suspend, resulting in a WARN message from the clock framework when
> attempting to disable already-disabled clocks.
> 
> [   84.384540] clk:231:5 already disabled
> [   84.388314] WARNING: CPU: 2 PID: 531 at /drivers/clk/clk.c:1181 clk_core_disable+0xa4/0xac
> ...
> [   84.579183] Call trace:
> [   84.581624]  clk_core_disable+0xa4/0xac
> [   84.585457]  clk_disable+0x30/0x4c
> [   84.588857]  cdns_dsi_suspend+0x20/0x58 [cdns_dsi]
> [   84.593651]  pm_generic_suspend+0x2c/0x44
> [   84.597661]  ti_sci_pd_suspend+0xbc/0x15c
> [   84.601670]  dpm_run_callback+0x8c/0x14c
> [   84.605588]  __device_suspend+0x1a0/0x56c
> [   84.609594]  dpm_suspend+0x17c/0x21c
> [   84.613165]  dpm_suspend_start+0xa0/0xa8
> [   84.617083]  suspend_devices_and_enter+0x12c/0x634
> [   84.621872]  pm_suspend+0x1fc/0x368
> 
> To address this issue, replace UNIVERSAL_DEV_PM_OPS() with
> SET_RUNTIME_PM_OPS(), enabling suspend/resume handling through the
> _enable()/_disable() hooks managed by the DRM framework for both
> runtime and system-wide PM.
> 
> Cc: <stable@...r.kernel.org> # 6.1.x
> Fixes: e19233955d9e ("drm/bridge: Add Cadence DSI driver")
> Signed-off-by: Vitor Soares <vitor.soares@...adex.com>

I am a little bit stuck on what is the best way to have this patch
moving forward.

Who can help on this?
Can any of you guide me a little bit?

Francesco