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

[karo-tx-linux.git] / drivers / gpu / drm / i915 / intel_ddi.c

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 2643d3b8b67daefda6e13f235a14cacfb19ef10f..e2665e09d5dff3a3ab5699505644dbf3ae5bc099 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1145,9 +1145,14 @@ bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        enum port port = intel_ddi_get_encoder_port(encoder);
+       enum intel_display_power_domain power_domain;
        u32 tmp;
        int i;
 
+       power_domain = intel_display_port_power_domain(encoder);
+       if (!intel_display_power_enabled(dev_priv, power_domain))
+               return false;
+
        tmp = I915_READ(DDI_BUF_CTL(port));
 
        if (!(tmp & DDI_BUF_CTL_ENABLE))