[PATCH v3 11/13] drm/i915/backlight: Use drm helper to initialize edp backlight

[Murthy, Arun R]

> -----Original Message-----
> From: Kandpal, Suraj <suraj.kandpal at intel.com>
> Sent: Friday, June 20, 2025 12:05 PM
> To: intel-xe at lists.freedesktop.org; intel-gfx at lists.freedesktop.org; dri-
> devel at lists.freedesktop.org; nouveau at lists.freedesktop.org
> Cc: Murthy, Arun R <arun.r.murthy at intel.com>; Kandpal, Suraj
> <suraj.kandpal at intel.com>
> Subject: [PATCH v3 11/13] drm/i915/backlight: Use drm helper to initialize edp
> backlight
> 
> Now that drm_edp_backlight init has been modified to take into account the
> setup of lumininace based brightness manipulation we can just use that.
> 
> --v2
> -Fix commit message [Arun]
> 
> Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
> ---
>  .../drm/i915/display/intel_dp_aux_backlight.c | 98 +++++++++----------
>  1 file changed, 48 insertions(+), 50 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> index 800d07c7f041..117c762fa2fe 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -584,9 +584,37 @@ static int intel_dp_aux_vesa_setup_backlight(struct
> intel_connector *connector,
>  	u8 current_mode;
>  	int ret;
> 
> -	if (panel->backlight.edp.vesa.luminance_control_support) {
> +	ret = drm_edp_backlight_init(&intel_dp->aux, &panel-
> >backlight.edp.vesa.info,
> +				     luminance_range->max_luminance,
> +				     panel->vbt.backlight.pwm_freq_hz,
> +				     intel_dp->edp_dpcd, &current_level,
> &current_mode,
> +				     false);
> +	if (ret < 0)
> +		return ret;
> +
> +	drm_dbg_kms(display->drm,
> +		    "[CONNECTOR:%d:%s] AUX VESA backlight enable is
> controlled through %s\n",
> +		    connector->base.base.id, connector->base.name,
> +		    dpcd_vs_pwm_str(panel-
> >backlight.edp.vesa.info.aux_enable));
> +	drm_dbg_kms(display->drm,
> +		    "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled
> through %s\n",
> +		    connector->base.base.id, connector->base.name,
> +		    dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set));
> +
Can these both debug prints be combined?

With the above change
Reviewed-by: Arun R Murthy <arun.r.murthy at intel.com>

Thanks and Regards,
Arun R Murthy
-------------------
> +	if (!panel->backlight.edp.vesa.info.aux_set ||
> +	    !panel->backlight.edp.vesa.info.aux_enable) {
> +		ret = panel->backlight.pwm_funcs->setup(connector, pipe);
> +		if (ret < 0) {
> +			drm_err(display->drm,
> +				"[CONNECTOR:%d:%s] Failed to setup PWM
> backlight controls for eDP backlight: %d\n",
> +				connector->base.base.id, connector-
> >base.name, ret);
> +			return ret;
> +		}
> +	}
> +
> +	if (panel->backlight.edp.vesa.info.luminance_set) {
>  		if (luminance_range->max_luminance) {
> -			panel->backlight.max = luminance_range-
> >max_luminance;
> +			panel->backlight.max = panel-
> >backlight.edp.vesa.info.max;
>  			panel->backlight.min = luminance_range-
> >min_luminance;
>  		} else {
>  			panel->backlight.max = 512;
> @@ -597,56 +625,26 @@ static int intel_dp_aux_vesa_setup_backlight(struct
> intel_connector *connector,
>  		drm_dbg_kms(display->drm,
>  			    "[CONNECTOR:%d:%s] AUX VESA Nits backlight level
> is controlled through DPCD\n",
>  			    connector->base.base.id, connector->base.name);
> -	} else {
> -		ret = drm_edp_backlight_init(&intel_dp->aux, &panel-
> >backlight.edp.vesa.info,
> -					     luminance_range->max_luminance,
> -					     panel->vbt.backlight.pwm_freq_hz,
> -					     intel_dp->edp_dpcd,
> &current_level, &current_mode,
> -					     false);
> -		if (ret < 0)
> -			return ret;
> -
> -		drm_dbg_kms(display->drm,
> -			    "[CONNECTOR:%d:%s] AUX VESA backlight enable is
> controlled through %s\n",
> -			    connector->base.base.id, connector->base.name,
> -			    dpcd_vs_pwm_str(panel-
> >backlight.edp.vesa.info.aux_enable));
> -		drm_dbg_kms(display->drm,
> -			    "[CONNECTOR:%d:%s] AUX VESA backlight level is
> controlled through %s\n",
> -			    connector->base.base.id, connector->base.name,
> -			    dpcd_vs_pwm_str(panel-
> >backlight.edp.vesa.info.aux_set));
> -
> -		if (!panel->backlight.edp.vesa.info.aux_set ||
> -		    !panel->backlight.edp.vesa.info.aux_enable) {
> -			ret = panel->backlight.pwm_funcs->setup(connector,
> pipe);
> -			if (ret < 0) {
> -				drm_err(display->drm,
> -					"[CONNECTOR:%d:%s] Failed to setup
> PWM backlight controls for eDP backlight: %d\n",
> -					connector->base.base.id, connector-
> >base.name, ret);
> -				return ret;
> -			}
> +	} else if (panel->backlight.edp.vesa.info.aux_set) {
> +		panel->backlight.max = panel->backlight.edp.vesa.info.max;
> +		panel->backlight.min = 0;
> +		if (current_mode ==
> DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
> +			panel->backlight.level = current_level;
> +			panel->backlight.enabled = panel->backlight.level != 0;
> +		} else {
> +			panel->backlight.level = panel->backlight.max;
> +			panel->backlight.enabled = false;
>  		}
> -
> -		if (panel->backlight.edp.vesa.info.aux_set) {
> -			panel->backlight.max = panel-
> >backlight.edp.vesa.info.max;
> -			panel->backlight.min = 0;
> -			if (current_mode ==
> DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
> -				panel->backlight.level = current_level;
> -				panel->backlight.enabled = panel-
> >backlight.level != 0;
> -			} else {
> -				panel->backlight.level = panel->backlight.max;
> -				panel->backlight.enabled = false;
> -			}
> +	} else {
> +		panel->backlight.max = panel->backlight.pwm_level_max;
> +		panel->backlight.min = panel->backlight.pwm_level_min;
> +		if (current_mode ==
> DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {
> +			panel->backlight.level =
> +				panel->backlight.pwm_funcs->get(connector,
> pipe);
> +			panel->backlight.enabled = panel-
> >backlight.pwm_enabled;
>  		} else {
> -			panel->backlight.max = panel-
> >backlight.pwm_level_max;
> -			panel->backlight.min = panel-
> >backlight.pwm_level_min;
> -			if (current_mode ==
> DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {
> -				panel->backlight.level =
> -					panel->backlight.pwm_funcs-
> >get(connector, pipe);
> -				panel->backlight.enabled = panel-
> >backlight.pwm_enabled;
> -			} else {
> -				panel->backlight.level = panel->backlight.max;
> -				panel->backlight.enabled = false;
> -			}
> +			panel->backlight.level = panel->backlight.max;
> +			panel->backlight.enabled = false;
>  		}
>  	}
> 
> --
> 2.34.1