Hi Alex,
Below is a patch against the master branch of libdrm that adds support
for waits for vblank events on CRTCs that are greater than 1 (and thus
cannot be represented using current primary/secondary flags interface).
The patch adds a new DRM_CAP so that the application can check whether the
new vblank interface is supported and also adds the new DRM_VBLANK mask
and shift value so that the application can construct vblank_wait ioctls
that refer to crtc > 1
The issue was discussed on the dri-devel list in these two threads
http://lists.freedesktop.org/archives/dri-devel/2011-March/009009.html
http://lists.freedesktop.org/archives/dri-devel/2011-March/009025.html
Regards,
Ilija
Reviewed-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
Acked-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
diff --git a/include/drm/drm.h b/include/drm/drm.h
index 416673a..10afaf1 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -755,6 +755,7 @@ struct drm_event_vblank {
};
#define DRM_CAP_DUMB_BUFFER 0x1
+#define DRM_CAP_HIGH_CRTC 0x2
/* typedef area */
typedef struct drm_clip_rect drm_clip_rect_t;
diff --git a/xf86drm.h b/xf86drm.h
index bf0d5df..e2bea06 100644
--- a/xf86drm.h
+++ b/xf86drm.h
@@ -302,6 +302,8 @@ typedef enum {
DRM_VBLANK_SECONDARY = 0x20000000, /**< Secondary display controller */
DRM_VBLANK_SIGNAL = 0x40000000 /* Send signal instead of blocking */
} drmVBlankSeqType;
+#define DRM_VBLANK_HIGH_CRTC_SHIFT 16
+#define DRM_VBLANK_HIGH_CRTC_MASK 0x001F0000
typedef struct _drmVBlankReq {
drmVBlankSeqType type;
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