From: Harry Wentland <harry.wentland@amd.com>
Date: Mon, 6 Feb 2017 11:23:20 -0500
Subject: drm/amd/display: Fix 64-bit division
Git-commit: ca709397b5bf904ef04eb981d3b50e8e93c15394
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/dce/dce_abm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
@@ -94,7 +94,7 @@ static unsigned int get_current_backligh
 	if (bl_period == 0)
 		bl_period = 0xFFFF;
 
-	current_backlight /= bl_period;
+	current_backlight = div_u64(current_backlight, bl_period);
 	current_backlight = (current_backlight + 1) >> 1;
 
 	current_backlight = (uint64_t)(current_backlight) * bl_period;