drm/i915: check the power domains in intel_lvds_get_hw_state()

Just like we do for the other encoders. This should fix some WARNs
when running pm_rpm on SNB.

Testcase: igt/pm_rpm
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80463
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 23126023aeba..cba04ddc8b01 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -71,8 +71,13 @@ static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
         struct drm_device *dev = encoder->base.dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
+        enum intel_display_power_domain power_domain;
         u32 tmp;
 
+        power_domain = intel_display_port_power_domain(encoder);
+        if (!intel_display_power_enabled(dev_priv, power_domain))
+                return false;
+
         tmp = I915_READ(lvds_encoder->reg);
 
         if (!(tmp & LVDS_PORT_EN))