drm/i915: No need to wait for eDP power off delay if panel is on

If the panel is powered up, there's no need to delay for the 'off'
interval when turning the panel on.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f5303e1..6db2a2d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -869,7 +869,16 @@ static void ironlake_wait_panel_off(struct intel_dp *intel_dp)
 {
        unsigned long   off_time;
        unsigned long   delay;
+
        DRM_DEBUG_KMS("Wait for panel power off time\n");
+
+       if (ironlake_edp_have_panel_power(intel_dp) ||
+           ironlake_edp_have_panel_vdd(intel_dp))
+       {
+               DRM_DEBUG_KMS("Panel still on, no delay needed\n");
+               return;
+       }
+
        off_time = intel_dp->panel_off_jiffies + msecs_to_jiffies(intel_dp->panel_power_down_delay);
        if (time_after(jiffies, off_time)) {
                DRM_DEBUG_KMS("Time already passed");