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drm: add support for monotonic vblank timestamps

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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>
This commit is contained in:
Imre Deak 2012-10-23 18:53:26 +00:00 • committed by Dave Airlie
parent e62f2f5acb
commit c61eef726a
5 changed files with 33 additions and 5 deletions
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3
drivers/gpu/drm/drm_ioctl.c
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@ -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;
}