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drm/vblank: Fix vblank timestamp debugs

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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: 67680d3c04 ("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>
This commit is contained in:
Ville Syrjälä 2017-11-13 17:02:10 +02:00
parent 44a2d56429
commit bcbec31ce5
1 changed files with 7 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/gpu/drm/drm_vblank.c
View file

@ -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,