[PATCH 2/2] drm/i915: Add backlight enable on/off delay for DP aux backlight control

["Lee, Shawn C" <shawn.c.lee@intel.com>]

Follow generla eDP backlight enable control sequence. Add T8 (valid video
data to backlight enable) delay before turn backlight_enable on.
And T9 (backlight disable to end of valida video data) delay after
backlight_enable off.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jose Roberto de Souza <jose.souza@intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>

Signed-off-by: Lee, Shawn C <shawn.c.lee@intel.com>
---
 drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
index 98210ae17285..b008e887f4e9 100644
--- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
@@ -217,12 +217,25 @@ static void intel_dp_aux_enable_backlight(const struct intel_crtc_state *crtc_st
 	}
 
 	intel_dp_aux_set_backlight(conn_state, connector->panel.backlight.level);
+
+	wait_remaining_ms_from_jiffies(intel_dp->last_power_on,
+				       intel_dp->backlight_on_delay);
+
 	set_aux_backlight_enable(intel_dp, true);
 }
 
 static void intel_dp_aux_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
+	struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
+	struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
+
+	intel_dp->last_backlight_off = jiffies;
+
 	set_aux_backlight_enable(enc_to_intel_dp(old_conn_state->best_encoder), false);
+
+	wait_remaining_ms_from_jiffies(intel_dp->last_backlight_off,
+				       intel_dp->backlight_off_delay);
+
 	intel_dp_aux_set_backlight(old_conn_state, 0);
 }
 
-- 
2.7.4

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