drm/i915: check port power domain when reading the encoder hw state

[cascardo/linux.git] / drivers / gpu / drm / i915 / intel_crt.c

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 96e28b8..4ef6d69 100644 (file)
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -68,8 +68,13 @@ static bool intel_crt_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_crt *crt = intel_encoder_to_crt(encoder);
+       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(crt->adpa_reg);
 
        if (!(tmp & ADPA_DAC_ENABLE))