diff options
| author | Heinrich Fink <heinrich.fink@daqri.com> | 2019-09-02 16:24:12 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2019-09-03 09:46:18 +0200 |
| commit | 6914f8eb64f9de5308e2968968145cf6eb304025 (patch) | |
| tree | 34f1a12e9232b2fe5a76f7e80c04b35e0b464489 /drivers/gpu/drm/drm_vblank.c | |
| parent | acff2f86b195653a9487fe3dbdbc821d77eff54a (diff) | |
| download | linux-6914f8eb64f9de5308e2968968145cf6eb304025.tar.gz | |
drm: Add high-precision time to vblank trace event
Store the timestamp of the current vblank in the new field 'time' of the
vblank trace event. If the timestamp is calculated by a driver that
supports high-precision vblank timing, set the field 'high-prec' to
'true'.
User space can now access actual hardware vblank times via the tracing
infrastructure. Tracing applications (such as GPUVis, see [0] for
related discussion), can use the newly added information to conduct a
more accurate analysis of display timing.
v2 Fix author name (missing last name)
[0] https://github.com/mikesart/gpuvis/issues/30
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Heinrich Fink <heinrich.fink@daqri.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190902142412.27846-2-heinrich.fink@daqri.com
Diffstat (limited to 'drivers/gpu/drm/drm_vblank.c')
| -rw-r--r-- | drivers/gpu/drm/drm_vblank.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c index fd1fbc77871f..c99feda25dea 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -1731,7 +1731,8 @@ static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe) send_vblank_event(dev, e, seq, now); } - trace_drm_vblank_event(pipe, seq); + trace_drm_vblank_event(pipe, seq, now, + dev->driver->get_vblank_timestamp != NULL); } /** |