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

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

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 63b95bb..cf7322e 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -243,11 +243,16 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
                                   enum pipe *pipe)
 {
        struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+       enum intel_display_power_domain power_domain;
        u32 port, func;
        enum pipe p;
 
        DRM_DEBUG_KMS("\n");
 
+       power_domain = intel_display_port_power_domain(encoder);
+       if (!intel_display_power_enabled(dev_priv, power_domain))
+               return false;
+
        /* XXX: this only works for one DSI output */
        for (p = PIPE_A; p <= PIPE_B; p++) {
                port = I915_READ(MIPI_PORT_CTRL(p));