[PATCH] drm/msm/dp: Propagate core clock enable error in runtime resume

[Dmitry Baryshkov]

On Fri, Jul 18, 2025 at 03:15:51PM -0700, Jessica Zhang wrote:
> Currently, runtime resume will always return success even if the core
> clock enable fails.
> 
> Propagate any core clock enable errors during the resume to avoid any
> crashes later.
> 
> Signed-off-by: Jessica Zhang <jessica.zhang at oss.qualcomm.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index d87d47cc7ec3..77d5e89239d2 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -463,17 +463,24 @@ static void msm_dp_display_host_phy_exit(struct msm_dp_display_private *dp)
>  	}
>  }
>  
> -static void msm_dp_display_host_init(struct msm_dp_display_private *dp)
> +static int msm_dp_display_host_init(struct msm_dp_display_private *dp)
>  {
> +	int rc;
> +
>  	drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
>  		dp->msm_dp_display.connector_type, dp->core_initialized,
>  		dp->phy_initialized);
>  
> -	msm_dp_ctrl_core_clk_enable(dp->ctrl);
> +	rc = msm_dp_ctrl_core_clk_enable(dp->ctrl);
> +	if (rc)
> +		return rc;
> +
>  	msm_dp_ctrl_reset(dp->ctrl);
>  	msm_dp_ctrl_enable_irq(dp->ctrl);
>  	msm_dp_aux_init(dp->aux);
>  	dp->core_initialized = true;
> +
> +	return 0;
>  }
>  
>  static void msm_dp_display_host_deinit(struct msm_dp_display_private *dp)
> @@ -1453,6 +1460,7 @@ static int msm_dp_pm_runtime_suspend(struct device *dev)
>  static int msm_dp_pm_runtime_resume(struct device *dev)
>  {
>  	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
> +	int rc;
>  
>  	/*
>  	 * for eDP, host cotroller, HPD block and PHY are enabled here
> @@ -1462,14 +1470,14 @@ static int msm_dp_pm_runtime_resume(struct device *dev)
>  	 * HPD block is enabled at msm_dp_bridge_hpd_enable()
>  	 * PHY will be enabled at plugin handler later
>  	 */
> -	msm_dp_display_host_init(dp);
> +	rc = msm_dp_display_host_init(dp);


if (rc)
	return rc;


>  	if (dp->msm_dp_display.is_edp) {
>  		msm_dp_aux_hpd_enable(dp->aux);
>  		msm_dp_display_host_phy_init(dp);
>  	}
>  
>  	enable_irq(dp->irq);
> -	return 0;
> +	return rc;

Keep 'return 0' here.

>  }
>  
>  static const struct dev_pm_ops msm_dp_pm_ops = {
> 
> ---
> base-commit: d086c886ceb9f59dea6c3a9dae7eb89e780a20c9
> change-id: 20250703-dp-clk-error-7c1965066541
> 
> Best regards,
> --  
> Jessica Zhang <jessica.zhang at oss.qualcomm.com>
> 

-- 
With best wishes
Dmitry