This is needed to make applications using wait-for-vblank/page-flip timestamps independent of time ajdustments other than adjustments for HW clock jitter. I've tested these with an updated intel-gpu-test/flip_test and will send the update for that once there's no objection about this patchset. The patchset is based on the nightly branch of [1], with Rob Clark's "drm: add drm_send_vblank_event() helper" patchset applied. Changes since the RFC: - use monotonic instead of raw monotonic time - use a module global flag instead of a per-client flag to set the compatibility mode with GTOD timestamps - rebased on top of Rob Clark's drm_send_vblank_event patchset [1] git://people.freedesktop.org/~danvet/drm-intel Imre Deak (2): drm: use monotonic time in drm_calc_vbltimestamp_from_scanoutpos drm: add support for monotonic vblank timestamps drivers/gpu/drm/drm_ioctl.c | 3 +++ drivers/gpu/drm/drm_irq.c | 39 ++++++++++++++++++++++++++++++--------- drivers/gpu/drm/drm_stub.c | 8 ++++++++ include/drm/drmP.h | 1 + include/uapi/drm/drm.h | 1 + 5 files changed, 43 insertions(+), 9 deletions(-) -- 1.7.9.5
