[Intel-gfx] [PATCH 17/17] drm/i915: Warn if panel power is already on when enabling it

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We should never enable the panel power twice. That would indicate a bug
somewhere else as we would need to enable the port twice without
disabling it in between. Also print the port name.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index c8b58e4..51f4748 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1666,10 +1666,10 @@ static void edp_panel_on(struct intel_dp *intel_dp)
 	DRM_DEBUG_KMS("Turn eDP port %c panel power on\n",
 		      port_name(dp_to_dig_port(intel_dp)->port));
 
-	if (edp_have_panel_power(intel_dp)) {
-		DRM_DEBUG_KMS("eDP power already on\n");
+	if (WARN(edp_have_panel_power(intel_dp),
+		 "eDP port %c panel power already on\n",
+		 port_name(dp_to_dig_port(intel_dp)->port)))
 		return;
-	}
 
 	wait_panel_power_cycle(intel_dp);
 
-- 
2.0.4