From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AEFBA2222C7; Tue, 29 Apr 2025 06:32:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745908339; cv=none; b=E97nMP99aCvxgxnDQddEn270bNIZGm3k7inMVHJnGKjsZQ2bN1Q7H3es48FRFY8QP70tiPX60UmJrTN3A4q9defy71nQMzKb8AQyMprOa6vL0Kbp+AKqaCqK4z6+SLpHSXbh2OJdhHyFf4YHB/F96/no47oBaDzWcsd+zfgMEbk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745908339; c=relaxed/simple; bh=IZ7OLT5OmCO34GamkCsEAbPcSzA7K7qMQeTQuaVDBr8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=blPTnvnuaeeIOd957YC0Ie1bwzRoB+JIFVqnhBmR+Cm3venHfx7bu1ICoDJifUzpDNPTR6ddQuPjH8BSiSOFb6Sc2pYxvp8R4uYwJOft25xo4bPohpUhUdQcJTNIUD/DUJbK67Q7z1FI0xxHaweWjFbgikbNkxDtYY2o98y8XCM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=Onm1anIz; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="Onm1anIz" Received: from [192.168.88.20] (91-158-153-178.elisa-laajakaista.fi [91.158.153.178]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 341CE669; Tue, 29 Apr 2025 08:32:09 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1745908330; bh=IZ7OLT5OmCO34GamkCsEAbPcSzA7K7qMQeTQuaVDBr8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Onm1anIz64s93gLDhscLKJxK7sd1iKYvubEFfNWf5oP44VKQ8toi7AWGqD7ggoAi0 RxLLyZpcB9ZKeydt/WI3Y5KsnbDlGbS6ZKsgjx/D7PnCQlcdBVDkb6iuN/32M0K9Vj S9G7MRwEcA7S/9CkVXcNGGQgb3lTHf3JBr4KAHYk= Message-ID: Date: Tue, 29 Apr 2025 09:32:11 +0300 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] drm/bridge: cdns-dsi: Replace deprecated UNIVERSAL_DEV_PM_OPS() To: Vitor Soares Cc: Vitor Soares , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Aradhya Bhatia , Jayesh Choudhary , stable@vger.kernel.org, Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter References: <20250428094048.1459620-1-ivitro@gmail.com> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, On 28/04/2025 12:40, Vitor Soares wrote: > From: Vitor Soares > > 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 > DEFINE_RUNTIME_DEV_PM_OPS(), which avoids redundant suspend/resume calls > by checking if the device is already runtime suspended. > > Cc: # 6.1.x > Fixes: e19233955d9e ("drm/bridge: Add Cadence DSI driver") > Signed-off-by: Vitor Soares > --- > drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c > index b022dd6e6b6e..62179e55e032 100644 > --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c > +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c > @@ -1258,7 +1258,7 @@ static const struct mipi_dsi_host_ops cdns_dsi_ops = { > .transfer = cdns_dsi_transfer, > }; > > -static int __maybe_unused cdns_dsi_resume(struct device *dev) > +static int cdns_dsi_resume(struct device *dev) > { > struct cdns_dsi *dsi = dev_get_drvdata(dev); > > @@ -1269,7 +1269,7 @@ static int __maybe_unused cdns_dsi_resume(struct device *dev) > return 0; > } > > -static int __maybe_unused cdns_dsi_suspend(struct device *dev) > +static int cdns_dsi_suspend(struct device *dev) > { > struct cdns_dsi *dsi = dev_get_drvdata(dev); > > @@ -1279,8 +1279,8 @@ static int __maybe_unused cdns_dsi_suspend(struct device *dev) > return 0; > } > > -static UNIVERSAL_DEV_PM_OPS(cdns_dsi_pm_ops, cdns_dsi_suspend, cdns_dsi_resume, > - NULL); > +static DEFINE_RUNTIME_DEV_PM_OPS(cdns_dsi_pm_ops, cdns_dsi_suspend, > + cdns_dsi_resume, NULL); I'm not sure if this, or the UNIVERSAL_DEV_PM_OPS, is right here. When the system is suspended, the bridge drivers will get a call to the *_disable() hook, which then disables the device. If the bridge driver would additionally do something in its system suspend hook, it would conflict with normal disable path. I think bridges/panels should only deal with runtime PM. Tomi