Re: [PATCH v3] drm/bridge: cdns-dsi: Replace deprecated UNIVERSAL_DEV_PM_OPS()

[Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>]

On 12/05/2025 11:32, Vitor Soares wrote:
> From: Vitor Soares <vitor.soares@toradex.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@vger.kernel.org> # 6.1.x
> Fixes: e19233955d9e ("drm/bridge: Add Cadence DSI driver")
> Signed-off-by: Vitor Soares <vitor.soares@toradex.com>
> ---
> v2 -> v3
>   - Fix warning: 'cdns_dsi_suspend' defined but not used [-Wunused-function]
>   - Fix warning: 'cdns_dsi_resume' defined but not used [-Wunused-function]
> 
> v1 -> v2
>   - Rely only on SET_RUNTIME_PM_OPS() for the PM.
> 
>   drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 11 ++++++-----
>   1 file changed, 6 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..6429d541889c 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 +1279,9 @@ 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 const struct dev_pm_ops cdns_dsi_pm_ops = {
> +	RUNTIME_PM_OPS(cdns_dsi_suspend, cdns_dsi_resume, NULL)
> +};
>   
>   static int cdns_dsi_drm_probe(struct platform_device *pdev)
>   {
> @@ -1427,7 +1428,7 @@ static struct platform_driver cdns_dsi_platform_driver = {
>   	.driver = {
>   		.name   = "cdns-dsi",
>   		.of_match_table = cdns_dsi_of_match,
> -		.pm = &cdns_dsi_pm_ops,
> +		.pm = pm_ptr(&cdns_dsi_pm_ops),
>   	},
>   };
>   module_platform_driver(cdns_dsi_platform_driver);

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

  Tomi