linux-kernel - Re: [PATCH] cdns-dsi: Split pm_ops into runtime_pm and system

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Message-ID: <41291801-46bc-4d27-ae46-91d65e076820@ti.com>
Date: Sat, 10 Jan 2026 06:49:39 +0530
From: "Kumar, Udit" <u-kumar1@...com>
To: Abhash Kumar Jha <a-kumar2@...com>, <andrzej.hajda@...el.com>,
	<neil.armstrong@...aro.org>, <rfoss@...nel.org>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <simona@...ll.ch>,
	<devarsht@...com>
CC: <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	<Laurent.pinchart@...asonboard.com>, <jonas@...boo.se>,
	<jernej.skrabec@...il.com>, <s-jain1@...com>, <p-mantena@...com>,
	<aradhya.bhatia@...ux.dev>, <tomi.valkeinen@...asonboard.com>,
	<p.zabel@...gutronix.de>, <u-kumar1@...com>
Subject: Re: [PATCH] cdns-dsi: Split pm_ops into runtime_pm and system_sleep
 ops

$subject prefix, Please check with git log 
drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c

should be drm/bridge: cdns-dsi:....

On 1/9/2026 11:33 AM, Abhash Kumar Jha wrote:
> Use pm_runtime_force_suspend/resume in system_sleep pm callbacks to let
> runtime-pm take care of the coordination between system suspend and
> itself. This ensures that they do not interfere with each other.

Could you add details, where you saw interference


> Signed-off-by: Abhash Kumar Jha <a-kumar2@...com>
> ---
>   .../gpu/drm/bridge/cadence/cdns-dsi-core.c    | 32 +++++++++++++------
>   1 file changed, 23 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> index 09b289f0fcbf..25eaf0192013 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> @@ -1230,7 +1230,18 @@ 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_runtime_suspend(struct device *dev)
> +{
> +	struct cdns_dsi *dsi = dev_get_drvdata(dev);
> +
> +	clk_disable_unprepare(dsi->dsi_sys_clk);
> +	clk_disable_unprepare(dsi->dsi_p_clk);
> +	reset_control_assert(dsi->dsi_p_rst);

> +
> +	return 0;
> +}
> +
> +static int cdns_dsi_runtime_resume(struct device *dev)
>   {
>   	struct cdns_dsi *dsi = dev_get_drvdata(dev);
>   
> @@ -1241,18 +1252,21 @@ 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);
> +	return pm_runtime_force_suspend(dev);
> +}
>   
> -	clk_disable_unprepare(dsi->dsi_sys_clk);
> -	clk_disable_unprepare(dsi->dsi_p_clk);
> -	reset_control_assert(dsi->dsi_p_rst);
> -	return 0;
> +static int cdns_dsi_resume(struct device *dev)
> +{
> +	return pm_runtime_force_resume(dev);
>   }
>   
> -static UNIVERSAL_DEV_PM_OPS(cdns_dsi_pm_ops, cdns_dsi_suspend, cdns_dsi_resume,
> -			    NULL);
> +static const struct dev_pm_ops cdns_dsi_pm_ops = {
> +	SET_RUNTIME_PM_OPS(cdns_dsi_runtime_suspend,
> +			cdns_dsi_runtime_resume, NULL)
> +	SET_SYSTEM_SLEEP_PM_OPS(cdns_dsi_suspend, cdns_dsi_resume)
> +};
>   
>   static int cdns_dsi_drm_probe(struct platform_device *pdev)
>   {