[Intel-gfx] [PATCH v3 2/2] drm/i915: fix VDD state tracking after system resume

[Imre Deak]

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.

v2:
- unchanged
v3:
- call edp sanitizing from the encoder reset handler (Daniel)

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

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 71294b5..8741439 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4002,6 +4002,11 @@ void intel_dp_encoder_destroy(struct drm_encoder *encoder)
 	kfree(intel_dig_port);
 }
 
+static void intel_dp_encoder_reset(struct drm_encoder *encoder)
+{
+	intel_edp_panel_vdd_sanitize(to_intel_encoder(encoder));
+}
+
 static const struct drm_connector_funcs intel_dp_connector_funcs = {
 	.dpms = intel_connector_dpms,
 	.detect = intel_dp_detect,
@@ -4017,6 +4022,7 @@ static const struct drm_connector_helper_funcs intel_dp_connector_helper_funcs =
 };
 
 static const struct drm_encoder_funcs intel_dp_enc_funcs = {
+	.reset = intel_dp_encoder_reset,
 	.destroy = intel_dp_encoder_destroy,
 };
 
-- 
1.8.4