[PATCH] drm/i915/display: Fixed a screen flickering when turning on display from off

[gareth.yu at intel.com]

From: Gareth Yu <gareth.yu at intel.com>

Turn on the panel from zero brightness of the last state, the panel was set
a maximum PWM in the flow. Once the panel initialization is completed, the
backlight is restored to zero brightness. There is a flckering generated.

Set the brightness to the minimum value when the brightness is less or equal
to the minimum value to fix this flickering

Cc : Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>
Cc : Matt Roper <matthew.d.roper at intel.com>
Cc : Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Gareth Yu <gareth.yu at intel.com>
---
 drivers/gpu/drm/i915/display/intel_backlight.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_backlight.c b/drivers/gpu/drm/i915/display/intel_backlight.c
index 3f3cd944a1c5..855d6ead905c 100644
--- a/drivers/gpu/drm/i915/display/intel_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_backlight.c
@@ -762,7 +762,7 @@ static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state,
 	WARN_ON(panel->backlight.max == 0);
 
 	if (panel->backlight.level <= panel->backlight.min) {
-		panel->backlight.level = panel->backlight.max;
+		panel->backlight.level = panel->backlight.min;
 		if (panel->backlight.device)
 			panel->backlight.device->props.brightness =
 				scale_hw_to_user(connector,
-- 
2.25.1