drm/i915: Add new GET_PIPE_FROM_CRTC_ID ioctl.

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / gpu / drm / i915 / intel_display.c

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index bdcda36..3387cf3 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1804,6 +1804,37 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
        }
 }
 
+int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
+                               struct drm_file *file_priv)
+{
+       drm_i915_private_t *dev_priv = dev->dev_private;
+       struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
+       struct drm_crtc *crtc = NULL;
+       int pipe = -1;
+
+       if (!dev_priv) {
+               DRM_ERROR("called with no initialization\n");
+               return -EINVAL;
+       }
+
+       list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+               struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+               if (crtc->base.id == pipe_from_crtc_id->crtc_id) {
+                       pipe = intel_crtc->pipe;
+                       break;
+               }
+       }
+
+       if (pipe == -1) {
+               DRM_ERROR("no such CRTC id\n");
+               return -EINVAL;
+       }
+
+       pipe_from_crtc_id->pipe = pipe;
+
+       return 0;
+}
+
 struct drm_crtc *intel_get_crtc_from_pipe(struct drm_device *dev, int pipe)
 {
        struct drm_crtc *crtc = NULL;