During resume, while turning the EDP panel power on, we need not wait
blindly for panel_power_cycle_delay. Check if panel power down sequence
in progress and then only wait. This improves our resume time significantly.
Signed-off-by: Shobhit Kumar <shobhit.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f335c92..10ec669 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -617,6 +617,20 @@ static bool edp_have_panel_power(struct intel_dp *intel_dp)
return (I915_READ(_pp_stat_reg(intel_dp)) & PP_ON) != 0;
}
+static bool edp_panel_off_seq(struct intel_dp *intel_dp)
+{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ lockdep_assert_held(&dev_priv->pps_mutex);
+
+ if (IS_VALLEYVIEW(dev) &&
+ intel_dp->pps_pipe == INVALID_PIPE)
+ return false;
+
+ return (I915_READ(_pp_stat_reg(intel_dp)) & PP_SEQUENCE_POWER_DOWN) != 0;
+}
+
static bool edp_have_panel_vdd(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
@@ -2025,7 +2039,8 @@ static void edp_panel_on(struct intel_dp *intel_dp)
port_name(dp_to_dig_port(intel_dp)->port)))
return;
- wait_panel_power_cycle(intel_dp);
+ if (edp_panel_off_seq(intel_dp))
+ wait_panel_power_cycle(intel_dp);
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
pp = ironlake_get_pp_control(intel_dp);
--
2.4.3
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