[PATCH 2/2] drm/i915: fix VDD state tracking after system resume

[Imre Deak <imre.deak@intel.com>]

Just like during booting the BIOS can leave the VDD bit enabled after
system resume. So apply the same state sanitization there too. This
fixes a problem where after resume the port power domain refcount gets
unbalanced.

Reported-by: Jarkko Nikula <jarkko.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 065984d..8989069 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12875,6 +12875,12 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
 	/* HW state is read out, now we need to sanitize this mess. */
 	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 			    base.head) {
+		/*
+		 * Do the following only during resume, since at driver
+		 * loading it's done early when initializing the encoder.
+		 */
+		if (force_restore)
+			intel_edp_panel_vdd_sanitize(encoder);
 		intel_sanitize_encoder(encoder);
 	}
 
-- 
1.8.4