Fix some small off-by-one errors and a mismatch between 32 bit kernel interfaces for vblank count and 64 bit dri2 interfaces for target_msc et al.
Return corrected target_msc to swap scheduling in x-server. A revised version of the patch discussed here: http://lists.freedesktop.org/archives/nouveau/2011-September/009143.html Signed-off-by: Mario Kleiner <mario.klei...@tuebingen.mpg.de> --- src/nouveau_dri2.c | 23 +++++++++++++++++++++-- 1 files changed, 21 insertions(+), 2 deletions(-) diff --git a/src/nouveau_dri2.c b/src/nouveau_dri2.c index 8608678..719b3bb 100644 --- a/src/nouveau_dri2.c +++ b/src/nouveau_dri2.c @@ -387,11 +387,22 @@ nouveau_dri2_schedule_swap(ClientPtr client, DrawablePtr draw, if (ret) goto fail; + /* Truncate to match kernel interfaces; means occasional overflow + * misses, but that's generally not a big deal. + */ + *target_msc &= 0xffffffff; + divisor &= 0xffffffff; + remainder &= 0xffffffff; + /* Calculate a swap target if we don't have one */ if (current_msc >= *target_msc && divisor) *target_msc = current_msc + divisor - (current_msc - remainder) % divisor; + /* Avoid underflow of unsigned value below */ + if (*target_msc == 0) + *target_msc = 1; + /* Request a vblank event one frame before the target */ ret = nouveau_wait_vblank(draw, DRM_VBLANK_ABSOLUTE | DRM_VBLANK_EVENT, @@ -399,7 +410,8 @@ nouveau_dri2_schedule_swap(ClientPtr client, DrawablePtr draw, &expect_msc, NULL, s); if (ret) goto fail; - s->frame = (unsigned int) expect_msc & 0xffffffff; + s->frame = 1 + ((unsigned int) expect_msc & 0xffffffff); + *target_msc = 1 + expect_msc; } else { /* We can't/don't want to sync to vblank, just swap. */ nouveau_dri2_finish_swap(draw, 0, 0, 0, s); @@ -420,6 +432,13 @@ nouveau_dri2_schedule_wait(ClientPtr client, DrawablePtr draw, CARD64 current_msc; int ret; + /* Truncate to match kernel interfaces; means occasional overflow + * misses, but that's generally not a big deal. + */ + target_msc &= 0xffffffff; + divisor &= 0xffffffff; + remainder &= 0xffffffff; + if (!can_sync_to_vblank(draw)) { DRI2WaitMSCComplete(client, draw, target_msc, 0, 0); return TRUE; @@ -439,7 +458,7 @@ nouveau_dri2_schedule_wait(ClientPtr client, DrawablePtr draw, goto fail; /* Calculate a wait target if we don't have one */ - if (current_msc > target_msc && divisor) + if (current_msc >= target_msc && divisor) target_msc = current_msc + divisor - (current_msc - remainder) % divisor; -- 1.7.5.4 _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
