diff options
| author | Imre Deak <imre.deak@intel.com> | 2012-10-23 20:53:26 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-11-20 07:06:16 +0100 |
| commit | c61eef726a78ae77b6ce223d01ea2130f465fe5c (patch) | |
| tree | 7bd310556195005b5c4c1cbadadc9da1fbf5163c /drivers/gpu/drm/drm_ioctl.c | |
| parent | drm: use monotonic time in drm_calc_vbltimestamp_from_scanoutpos (diff) | |
| download | linux-c61eef726a78ae77b6ce223d01ea2130f465fe5c.tar.xz linux-c61eef726a78ae77b6ce223d01ea2130f465fe5c.zip | |
drm: add support for monotonic vblank timestamps
Jumps in the vblank and page flip event timestamps cause trouble for
clients, so we should avoid them. The timestamp we get currently with
gettimeofday can jump, so use instead monotonic timestamps.
For backward compatibility use a module flag to revert back to using
gettimeofday timestamps. Add also a DRM_CAP_TIMESTAMP_MONOTONIC flag
that is simply a read only version of the module flag, so that clients
can query this without depending on sysfs.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_ioctl.c')
| -rw-r--r-- | drivers/gpu/drm/drm_ioctl.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 23dd97506f28..e77bd8b57df2 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -287,6 +287,9 @@ int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; break; + case DRM_CAP_TIMESTAMP_MONOTONIC: + req->value = drm_timestamp_monotonic; + break; default: return -EINVAL; } |