27  * backlight through DP AUX can actually use two different interfaces: Intel's
28  * proprietary DP AUX backlight interface, and the standard VESA backlight
30  * advertise support for the standard VESA backlight interface when they
31  * don't properly support it. However, on these systems the Intel backlight
33  * usually just indicate that they use PWM backlight controls in their VBIOS
47  * DP AUX registers for Intel's proprietary HDR backlight interface. We define
111 /* Intel EDP backlight callbacks */
129 		    "[CONNECTOR:%d:%s] Detected %s HDR backlight interface version %d\n",  in intel_dp_aux_supports_hdr_backlight()
142 	 * do not use Intel proprietary eDP backlight control if we  in intel_dp_aux_supports_hdr_backlight()
152 …DR static metadata. Possible support for Intel HDR backlight interface is not used. If your backli…  in intel_dp_aux_supports_hdr_backlight()
158 	panel->backlight.edp.intel_cap.sdr_uses_aux =  in intel_dp_aux_supports_hdr_backlight()
160 	panel->backlight.edp.intel_cap.supports_2084_decode =  in intel_dp_aux_supports_hdr_backlight()
162 	panel->backlight.edp.intel_cap.supports_2020_gamut =  in intel_dp_aux_supports_hdr_backlight()
164 	panel->backlight.edp.intel_cap.supports_segmented_backlight =  in intel_dp_aux_supports_hdr_backlight()
166 	panel->backlight.edp.intel_cap.supports_sdp_colorimetry =  in intel_dp_aux_supports_hdr_backlight()
168 	panel->backlight.edp.intel_cap.supports_tone_mapping =  in intel_dp_aux_supports_hdr_backlight()
185 			"[CONNECTOR:%d:%s] Failed to read current backlight mode from DPCD\n",  in intel_dp_aux_hdr_get_backlight()
191 		if (!panel->backlight.edp.intel_cap.sdr_uses_aux) {  in intel_dp_aux_hdr_get_backlight()
192 			u32 pwm_level = panel->backlight.pwm_funcs->get(connector, pipe);  in intel_dp_aux_hdr_get_backlight()
197 		/* Assume 100% brightness if backlight controls aren't enabled yet */  in intel_dp_aux_hdr_get_backlight()
198 		return panel->backlight.max;  in intel_dp_aux_hdr_get_backlight()
249 	    panel->backlight.edp.intel_cap.sdr_uses_aux) {  in intel_dp_aux_hdr_set_backlight()
292 	 * According to spec segmented backlight needs to be set whenever panel is in  in intel_dp_aux_fill_hdr_tcon_params()
303 	if (panel->backlight.edp.intel_cap.supports_2020_gamut &&  in intel_dp_aux_fill_hdr_tcon_params()
309 	if (panel->backlight.edp.intel_cap.supports_sdp_colorimetry &&  in intel_dp_aux_fill_hdr_tcon_params()
333 			"[CONNECTOR:%d:%s] Failed to read current backlight control mode: %d\n",  in intel_dp_aux_hdr_enable_backlight()
340 	    panel->backlight.edp.intel_cap.sdr_uses_aux) {  in intel_dp_aux_hdr_enable_backlight()
347 		panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);  in intel_dp_aux_hdr_enable_backlight()
372 	/* Nothing to do for AUX based backlight controls */  in intel_dp_aux_hdr_disable_backlight()
373 	if (panel->backlight.edp.intel_cap.sdr_uses_aux)  in intel_dp_aux_hdr_disable_backlight()
377 	panel->backlight.pwm_funcs->disable(conn_state, intel_backlight_invert_pwm_level(connector, 0));  in intel_dp_aux_hdr_disable_backlight()
394 	buf[0] = panel->backlight.min & 0xFF;  in intel_dp_aux_write_panel_luminance_override()
395 	buf[1] = (panel->backlight.min & 0xFF00) >> 8;  in intel_dp_aux_write_panel_luminance_override()
396 	buf[2] = panel->backlight.max & 0xFF;  in intel_dp_aux_write_panel_luminance_override()
397 	buf[3] = (panel->backlight.max & 0xFF00) >> 8;  in intel_dp_aux_write_panel_luminance_override()
418 		    "[CONNECTOR:%d:%s] SDR backlight is controlled through %s\n",  in intel_dp_aux_hdr_setup_backlight()
420 		    dpcd_vs_pwm_str(panel->backlight.edp.intel_cap.sdr_uses_aux));  in intel_dp_aux_hdr_setup_backlight()
422 	if (!panel->backlight.edp.intel_cap.sdr_uses_aux) {  in intel_dp_aux_hdr_setup_backlight()
423 		ret = panel->backlight.pwm_funcs->setup(connector, pipe);  in intel_dp_aux_hdr_setup_backlight()
426 				"[CONNECTOR:%d:%s] Failed to setup SDR backlight controls through PWM: %d\n",  in intel_dp_aux_hdr_setup_backlight()
433 		panel->backlight.max = luminance_range->max_luminance;  in intel_dp_aux_hdr_setup_backlight()
434 		panel->backlight.min = luminance_range->min_luminance;  in intel_dp_aux_hdr_setup_backlight()
436 		panel->backlight.max = 512;  in intel_dp_aux_hdr_setup_backlight()
437 		panel->backlight.min = 0;  in intel_dp_aux_hdr_setup_backlight()
443 		    "[CONNECTOR:%d:%s] Using AUX HDR interface for backlight control (range %d..%d)\n",  in intel_dp_aux_hdr_setup_backlight()
445 		    panel->backlight.min, panel->backlight.max);  in intel_dp_aux_hdr_setup_backlight()
447 	panel->backlight.level = intel_dp_aux_hdr_get_backlight(connector, pipe);  in intel_dp_aux_hdr_setup_backlight()
448 	panel->backlight.enabled = panel->backlight.level != 0;  in intel_dp_aux_hdr_setup_backlight()
453 /* VESA backlight callbacks */
462 	if (panel->backlight.edp.vesa.luminance_control_support) {  in intel_dp_aux_vesa_get_backlight()
476 	return connector->panel.backlight.level;  in intel_dp_aux_vesa_get_backlight()
511 	if (panel->backlight.edp.vesa.luminance_control_support) {  in intel_dp_aux_vesa_set_backlight()
516 	if (!panel->backlight.edp.vesa.info.aux_set) {  in intel_dp_aux_vesa_set_backlight()
522 	drm_edp_backlight_set_level(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);  in intel_dp_aux_vesa_set_backlight()
534 	if (panel->backlight.edp.vesa.luminance_control_support) {  in intel_dp_aux_vesa_enable_backlight()
545 	if (!panel->backlight.edp.vesa.info.aux_enable) {  in intel_dp_aux_vesa_enable_backlight()
548 		if (!panel->backlight.edp.vesa.info.aux_set)  in intel_dp_aux_vesa_enable_backlight()
552 								     panel->backlight.pwm_level_max);  in intel_dp_aux_vesa_enable_backlight()
554 		panel->backlight.pwm_funcs->enable(crtc_state, conn_state, pwm_level);  in intel_dp_aux_vesa_enable_backlight()
557 	drm_edp_backlight_enable(&intel_dp->aux, &panel->backlight.edp.vesa.info, level);  in intel_dp_aux_vesa_enable_backlight()
567 	if (panel->backlight.edp.vesa.luminance_control_support)  in intel_dp_aux_vesa_disable_backlight()
570 	drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info);  in intel_dp_aux_vesa_disable_backlight()
572 	if (!panel->backlight.edp.vesa.info.aux_enable)  in intel_dp_aux_vesa_disable_backlight()
573 		panel->backlight.pwm_funcs->disable(old_conn_state,  in intel_dp_aux_vesa_disable_backlight()
588 	if (panel->backlight.edp.vesa.luminance_control_support) {  in intel_dp_aux_vesa_setup_backlight()
590 			panel->backlight.max = luminance_range->max_luminance;  in intel_dp_aux_vesa_setup_backlight()
591 			panel->backlight.min = luminance_range->min_luminance;  in intel_dp_aux_vesa_setup_backlight()
593 			panel->backlight.max = 512;  in intel_dp_aux_vesa_setup_backlight()
594 			panel->backlight.min = 0;  in intel_dp_aux_vesa_setup_backlight()
596 		panel->backlight.level = intel_dp_aux_vesa_get_backlight(connector, 0);  in intel_dp_aux_vesa_setup_backlight()
597 		panel->backlight.enabled = panel->backlight.level != 0;  in intel_dp_aux_vesa_setup_backlight()
599 			    "[CONNECTOR:%d:%s] AUX VESA Nits backlight level is controlled through DPCD\n",  in intel_dp_aux_vesa_setup_backlight()
602 		ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info,  in intel_dp_aux_vesa_setup_backlight()
603 					     panel->vbt.backlight.pwm_freq_hz, intel_dp->edp_dpcd,  in intel_dp_aux_vesa_setup_backlight()
609 			    "[CONNECTOR:%d:%s] AUX VESA backlight enable is controlled through %s\n",  in intel_dp_aux_vesa_setup_backlight()
611 			    dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_enable));  in intel_dp_aux_vesa_setup_backlight()
613 			    "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled through %s\n",  in intel_dp_aux_vesa_setup_backlight()
615 			    dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set));  in intel_dp_aux_vesa_setup_backlight()
617 		if (!panel->backlight.edp.vesa.info.aux_set ||  in intel_dp_aux_vesa_setup_backlight()
618 		    !panel->backlight.edp.vesa.info.aux_enable) {  in intel_dp_aux_vesa_setup_backlight()
619 			ret = panel->backlight.pwm_funcs->setup(connector, pipe);  in intel_dp_aux_vesa_setup_backlight()
622 					"[CONNECTOR:%d:%s] Failed to setup PWM backlight controls for eDP backlight: %d\n",  in intel_dp_aux_vesa_setup_backlight()
628 		if (panel->backlight.edp.vesa.info.aux_set) {  in intel_dp_aux_vesa_setup_backlight()
629 			panel->backlight.max = panel->backlight.edp.vesa.info.max;  in intel_dp_aux_vesa_setup_backlight()
630 			panel->backlight.min = 0;  in intel_dp_aux_vesa_setup_backlight()
632 				panel->backlight.level = current_level;  in intel_dp_aux_vesa_setup_backlight()
633 				panel->backlight.enabled = panel->backlight.level != 0;  in intel_dp_aux_vesa_setup_backlight()
635 				panel->backlight.level = panel->backlight.max;  in intel_dp_aux_vesa_setup_backlight()
636 				panel->backlight.enabled = false;  in intel_dp_aux_vesa_setup_backlight()
639 			panel->backlight.max = panel->backlight.pwm_level_max;  in intel_dp_aux_vesa_setup_backlight()
640 			panel->backlight.min = panel->backlight.pwm_level_min;  in intel_dp_aux_vesa_setup_backlight()
642 				panel->backlight.level =  in intel_dp_aux_vesa_setup_backlight()
643 					panel->backlight.pwm_funcs->get(connector, pipe);  in intel_dp_aux_vesa_setup_backlight()
644 				panel->backlight.enabled = panel->backlight.pwm_enabled;  in intel_dp_aux_vesa_setup_backlight()
646 				panel->backlight.level = panel->backlight.max;  in intel_dp_aux_vesa_setup_backlight()
647 				panel->backlight.enabled = false;  in intel_dp_aux_vesa_setup_backlight()
653 		    "[CONNECTOR:%d:%s] Using AUX VESA interface for backlight control\n",  in intel_dp_aux_vesa_setup_backlight()
668 			    "[CONNECTOR:%d:%s] AUX Luminance Based Backlight Control Supported!\n",  in intel_dp_aux_supports_vesa_backlight()
670 		panel->backlight.edp.vesa.luminance_control_support = true;  in intel_dp_aux_supports_vesa_backlight()
676 			    "[CONNECTOR:%d:%s] AUX Backlight Control Supported!\n",  in intel_dp_aux_supports_vesa_backlight()
714 		switch (panel->vbt.backlight.type) {  in intel_dp_aux_init_backlight_funcs()
726 		if (panel->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE)  in intel_dp_aux_init_backlight_funcs()
744 	 * Since Intel has their own backlight control interface, the majority of machines out there  in intel_dp_aux_init_backlight_funcs()
745 	 * using DPCD backlight controls with Intel GPUs will be using this interface as opposed to  in intel_dp_aux_init_backlight_funcs()
751 	 * interfaces, the VESA backlight interface will stop working once we've programmed the  in intel_dp_aux_init_backlight_funcs()
753 	 * backlight interface at all. This means that the only sensible way for us to detect both  in intel_dp_aux_init_backlight_funcs()
758 		drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using Intel proprietary eDP backlight controls\n",  in intel_dp_aux_init_backlight_funcs()
760 		panel->backlight.funcs = &intel_dp_hdr_bl_funcs;  in intel_dp_aux_init_backlight_funcs()
765 		drm_dbg_kms(dev, "[CONNECTOR:%d:%s] Using VESA eDP backlight controls\n",  in intel_dp_aux_init_backlight_funcs()
767 		panel->backlight.funcs = &intel_dp_vesa_bl_funcs;  in intel_dp_aux_init_backlight_funcs()