drm/i915: fix initial timestamps for PP sequencing logic

The initial jiffies value can be non-0, so set the inital panel power
sequencer timestamps accordingly. This didn't cause a problem on 64 bit
machines but on 32 bit jiffies is initially -300*HZ, so if the panel
power is initally off in the call from edp_panel_vdd_on()->
wait_panel_power_cycle() we'd wait up to ~300 sec more than needed.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 3760890..0ef2690 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3491,6 +3491,13 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
        }
 }
 
+static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
+{
+       intel_dp->last_power_cycle = jiffies;
+       intel_dp->last_power_on = jiffies;
+       intel_dp->last_backlight_off = jiffies;
+}
+
 static void
 intel_dp_init_panel_power_sequencer(struct drm_device *dev,
                                    struct intel_dp *intel_dp,
@@ -3835,8 +3842,10 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
                BUG();
        }
 
-       if (is_edp(intel_dp))
+       if (is_edp(intel_dp)) {
+               intel_dp_init_panel_power_timestamps(intel_dp);
                intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
+       }
 
        error = intel_dp_i2c_init(intel_dp, intel_connector, name);
        WARN(error, "intel_dp_i2c_init failed with error %d for port %c\n",