Convert the monotonic timestamp with ktime_mono_to_real() in drm_calc_vbltimestamp_from_scanoutpos(). In get_drm_timestamp we can call either ktime_get() or ktime_get_real() depending on drm_timestamp_monotonic. No point in having two calls into the core for CLOCK_REALTIME. Signed-off-by: Thomas Gleixner --- drivers/gpu/drm/drm_irq.c | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-) Index: tip/drivers/gpu/drm/drm_irq.c =================================================================== --- tip.orig/drivers/gpu/drm/drm_irq.c +++ tip/drivers/gpu/drm/drm_irq.c @@ -542,8 +542,8 @@ int drm_calc_vbltimestamp_from_scanoutpo const struct drm_crtc *refcrtc, const struct drm_display_mode *mode) { - ktime_t stime, etime, mono_time_offset; struct timeval tv_etime; + ktime_t stime, etime; int vbl_status; int vpos, hpos, i; int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns; @@ -588,13 +588,6 @@ int drm_calc_vbltimestamp_from_scanoutpo vbl_status = dev->driver->get_scanout_position(dev, crtc, flags, &vpos, &hpos, &stime, &etime); - /* - * Get correction for CLOCK_MONOTONIC -> CLOCK_REALTIME if - * CLOCK_REALTIME is requested. - */ - if (!drm_timestamp_monotonic) - mono_time_offset = ktime_get_monotonic_offset(); - /* Return as no-op if scanout query unsupported or failed. */ if (!(vbl_status & DRM_SCANOUTPOS_VALID)) { DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n", @@ -633,7 +626,7 @@ int drm_calc_vbltimestamp_from_scanoutpo delta_ns = vpos * linedur_ns + hpos * pixeldur_ns; if (!drm_timestamp_monotonic) - etime = ktime_sub(etime, mono_time_offset); + etime = ktime_mono_to_real(etime); /* save this only for debugging purposes */ tv_etime = ktime_to_timeval(etime); @@ -664,10 +657,7 @@ static struct timeval get_drm_timestamp( { ktime_t now; - now = ktime_get(); - if (!drm_timestamp_monotonic) - now = ktime_sub(now, ktime_get_monotonic_offset()); - + now = drm_timestamp_monotonic ? ktime_get() : ktime_get_real(); return ktime_to_timeval(now); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/