drm/i915/hdmi: implement get_hw_state

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 38a7006a84f4..bfe375466a0e 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -757,6 +757,35 @@ void intel_ddi_mode_set(struct drm_encoder *encoder,
         intel_hdmi->set_infoframes(encoder, adjusted_mode);
 }
 
+bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
+                            enum pipe *pipe)
+{
+        struct drm_device *dev = encoder->base.dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
+        u32 tmp;
+        int i;
+
+        tmp = I915_READ(DDI_BUF_CTL(intel_hdmi->ddi_port));
+
+        if (!(tmp & DDI_BUF_CTL_ENABLE))
+                return false;
+
+        for_each_pipe(i) {
+                tmp = I915_READ(DDI_FUNC_CTL(i));
+
+                if ((tmp & PIPE_DDI_PORT_MASK)
+                    == PIPE_DDI_SELECT_PORT(intel_hdmi->ddi_port)) {
+                        *pipe = i;
+                        return true;
+                }
+        }
+
+        DRM_DEBUG_KMS("No pipe for ddi port %i found\n", intel_hdmi->ddi_port);
+
+        return true;
+}
+
 void intel_enable_ddi(struct intel_encoder *encoder)
 {
         struct drm_device *dev = encoder->base.dev;