Clarify the difference between crtc_id (DRM object) and pipe (index into
drmModeRes->crtcs array, possible_crtcs bitmask).

Signed-off-by: Daniel Stone <dani...@collabora.com>
Reviewed-by: Quentin Glidic <sardemff7+...@sardemff7.net>
Differential Revision: https://phabricator.freedesktop.org/D1405
---
 libweston/compositor-drm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index a899213..268117d 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -155,8 +155,8 @@ struct drm_output {
        struct weston_output base;
        drmModeConnector *connector;
 
-       uint32_t crtc_id;
-       int pipe;
+       uint32_t crtc_id; /* object ID to pass to DRM functions */
+       int pipe; /* index of CRTC in resource array / bitmasks */
        uint32_t connector_id;
        drmModeCrtcPtr original_crtc;
        struct drm_edid edid;
-- 
2.9.3

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