From: Harry VanZyllDeJong <hvanzyll@amd.com>
Date: Wed, 17 Sep 2025 20:46:13 +0000 (-0400)
Subject: drm/amd/display: fix duplicate aux command with AMD aux backlight
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9dddfac98e3aa2e0c5164af948edd1fc4b550713;p=thirdparty%2Flinux.git

drm/amd/display: fix duplicate aux command with AMD aux backlight

when using AMD aux backlight control, we avoid sending backlight
update commands to DMUB firmware because it is controlled by aux commands
in driver.

Reviewed-by: Iswara Nagulendran <iswara.nagulendran@amd.com>
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Harry VanZyllDeJong <hvanzyll@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c
index b822f2dffff0e..d1ecdb92b072b 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c
@@ -710,7 +710,8 @@ bool dcn31_set_backlight_level(struct pipe_ctx *pipe_ctx,
 			panel_cntl->inst,
 			panel_cntl->pwrseq_inst);
 
-	dmub_abm_set_backlight(dc, backlight_level_params, panel_cntl->inst);
+	if (backlight_level_params->control_type != BACKLIGHT_CONTROL_AMD_AUX)
+		dmub_abm_set_backlight(dc, backlight_level_params, panel_cntl->inst);
 
 	return true;
 }