TearFree option backported to modesetting(4) driver

Contributed by rueda on 2025-06-10 from the no-tears-before-bedtime dept.

Following a discussion on tech@ [initiated by a post with patch from Ted Unangst (tedu@)], the "TearFree" option has been backported to the xenocara modesetting(4) driver in -current:

CVSROOT:	/cvs
Module name:	xenocara
Changes by:	matthieu@cvs.openbsd.org	2025/06/09 12:18:36

Modified files:
	xserver/dix    : pixmap.c 
	xserver/hw/xfree86/common: xf86Mode.c 
	xserver/hw/xfree86/drivers/modesetting: dri2.c driver.c driver.h 
	                                        drmmode_display.c 
	                                        drmmode_display.h 
	                                        dumb_bo.c meson.build 
	                                        modesetting.man 
	                                        pageflip.c present.c 
	                                        vblank.c 
	xserver/hw/xfree86/modes: xf86Crtc.h xf86Rotate.c 
	xserver/include: displaymode.h pixmap.h 
	xserver/present: present.h present_screen.c 

Log message:
Backport TearFree page flips for the modesetting driver from X.Org maaster.

Work done by tedu@ based on previous diffs by jcs@ and stsp@.
One bug fix in master by me. tested and ok tb@. commit on behalf of tedu@

The option is on by default, so users of the relevant hardware can expect smooth(er) scrolling ahead.

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