From e9c9e5ae8b57a6f29aecc303b36173e0be7fdd60 Mon Sep 17 00:00:00 2001
From: Puthikorn Voravootivat <puthik@chromium.org>
Date: Thu, 11 May 2017 16:02:21 -0700
Subject: [PATCH] drm/i915: Set backlight mode before enable backlight
Git-commit: e9c9e5ae8b57a6f29aecc303b36173e0be7fdd60
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900
We should set backlight mode register before set register to
enable the backlight.
Signed-off-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170511230225.142870-6-puthik@chromium.org
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
@@ -99,8 +99,6 @@ static void intel_dp_aux_enable_backligh
uint8_t dpcd_buf = 0;
uint8_t edp_backlight_mode = 0;
- set_aux_backlight_enable(intel_dp, true);
-
if (drm_dp_dpcd_readb(&intel_dp->aux,
DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &dpcd_buf) != 1) {
DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n",
@@ -127,6 +125,8 @@ static void intel_dp_aux_enable_backligh
default:
break;
}
+
+ set_aux_backlight_enable(intel_dp, true);
}
static void intel_dp_aux_disable_backlight(struct intel_connector *connector)