diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2017-11-13 18:02:10 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2017-11-29 16:10:53 +0300 |
| commit | bcbec31ce500fe036f75a19bca5c73bfa6dd420b (patch) | |
| tree | 72afef93301b9f19150ca7dadeff7af5bb071e36 | |
| parent | 44a2d56429bc9d1f9edd56761bfb504ed68fef01 (diff) | |
| download | linux-bcbec31ce500fe036f75a19bca5c73bfa6dd420b.tar.xz | |
drm/vblank: Fix vblank timestamp debugs
We're currently calling ktime_to_timespec64() on stack garbage
hence the debug output for vblank timestamps also contains garbage.
Let's assing something to the ktime_t first before we go converting
it to a timespec.
While at it micro-optimize the ktime_to_timespec64() calls away
when vblank debugging isn't enabled.
Fixes: 67680d3c0464 ("drm: vblank: use ktime_t instead of timeval")
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Keith Packard <keithp@keithp.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Dave Airlie <airlied@redhat.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171113150210.11311-1-ville.syrjala@linux.intel.com
Acked-by: Arnd Bergmann <arnd@arndb.de>
| -rw-r--r-- | drivers/gpu/drm/drm_vblank.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c index 09c1c4ff93ca..2c68909637b5 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -664,14 +664,16 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos), mode->crtc_clock); - /* save this only for debugging purposes */ - ts_etime = ktime_to_timespec64(etime); - ts_vblank_time = ktime_to_timespec64(*vblank_time); /* Subtract time delta from raw timestamp to get final * vblank_time timestamp for end of vblank. */ - etime = ktime_sub_ns(etime, delta_ns); - *vblank_time = etime; + *vblank_time = ktime_sub_ns(etime, delta_ns); + + if ((drm_debug & DRM_UT_VBL) == 0) + return true; + + ts_etime = ktime_to_timespec64(etime); + ts_vblank_time = ktime_to_timespec64(*vblank_time); DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n", pipe, hpos, vpos, |