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Line 1447... Line 1447...
1447 
 * an optional accurate timestamp of when query happened.
 1447 
 * an optional accurate timestamp of when query happened.
1448 
 *
 1448 
 *
1449 
 * \param dev Device to query.
 1449 
 * \param dev Device to query.
1450 
 * \param crtc Crtc to query.
 1450 
 * \param crtc Crtc to query.
1451 
 * \param flags Flags from caller (DRM_CALLED_FROM_VBLIRQ or 0).
 1451 
 * \param flags Flags from caller (DRM_CALLED_FROM_VBLIRQ or 0).
- 
 
 1452 
 *              For driver internal use only also supports these flags:
- 
 
 1453 
 *
- 
 
 1454 
 *              USE_REAL_VBLANKSTART to use the real start of vblank instead
- 
 
 1455 
 *              of a fudged earlier start of vblank.
- 
 
 1456 
 *
- 
 
 1457 
 *              GET_DISTANCE_TO_VBLANKSTART to return distance to the
- 
 
 1458 
 *              fudged earlier start of vblank in *vpos and the distance
- 
 
 1459 
 *              to true start of vblank in *hpos.
- 
 
 1460 
 *
1452 
 * \param *vpos Location where vertical scanout position should be stored.
 1461 
 * \param *vpos Location where vertical scanout position should be stored.
1453 
 * \param *hpos Location where horizontal scanout position should go.
 1462 
 * \param *hpos Location where horizontal scanout position should go.
1454 
 * \param *stime Target location for timestamp taken immediately before
 1463 
 * \param *stime Target location for timestamp taken immediately before
1455 
 *               scanout position query. Can be NULL to skip timestamp.
 1464 
 *               scanout position query. Can be NULL to skip timestamp.
1456 
 * \param *etime Target location for timestamp taken immediately after
 1465 
 * \param *etime Target location for timestamp taken immediately after
Line 1590... Line 1599...
1590 
		/* No: Fake something reasonable which gives at least ok results. */
 1599 
		/* No: Fake something reasonable which gives at least ok results. */
1591 
		vbl_start = mode->crtc_vdisplay;
 1600 
		vbl_start = mode->crtc_vdisplay;
1592 
		vbl_end = 0;
 1601 
		vbl_end = 0;
1593 
	}
 1602 
	}
Line -... Line 1603...
- 
 
 1603 
 
- 
 
 1604 
	/* Called from driver internal vblank counter query code? */
- 
 
 1605 
	if (flags & GET_DISTANCE_TO_VBLANKSTART) {
- 
 
 1606 
	    /* Caller wants distance from real vbl_start in *hpos */
- 
 
 1607 
	    *hpos = *vpos - vbl_start;
- 
 
 1608 
	}
- 
 
 1609 
 
- 
 
 1610 
	/* Fudge vblank to start a few scanlines earlier to handle the
- 
 
 1611 
	 * problem that vblank irqs fire a few scanlines before start
- 
 
 1612 
	 * of vblank. Some driver internal callers need the true vblank
- 
 
 1613 
	 * start to be used and signal this via the USE_REAL_VBLANKSTART flag.
- 
 
 1614 
	 *
- 
 
 1615 
	 * The cause of the "early" vblank irq is that the irq is triggered
- 
 
 1616 
	 * by the line buffer logic when the line buffer read position enters
- 
 
 1617 
	 * the vblank, whereas our crtc scanout position naturally lags the
- 
 
 1618 
	 * line buffer read position.
- 
 
 1619 
	 */
- 
 
 1620 
	if (!(flags & USE_REAL_VBLANKSTART))
- 
 
 1621 
		vbl_start -= rdev->mode_info.crtcs[pipe]->lb_vblank_lead_lines;
1594 
 
 1622 
 
1595 
	/* Test scanout position against vblank region. */
 1623 
	/* Test scanout position against vblank region. */
1596 
	if ((*vpos < vbl_start) && (*vpos >= vbl_end))
 1624 
	if ((*vpos < vbl_start) && (*vpos >= vbl_end))
Line -... Line 1625...
- 
 
 1625 
		in_vbl = false;
- 
 
 1626 
 
- 
 
 1627 
	/* In vblank? */
- 
 
 1628 
	if (in_vbl)
- 
 
 1629 
	    ret |= DRM_SCANOUTPOS_IN_VBLANK;
- 
 
 1630 
 
- 
 
 1631 
	/* Called from driver internal vblank counter query code? */
- 
 
 1632 
	if (flags & GET_DISTANCE_TO_VBLANKSTART) {
- 
 
 1633 
		/* Caller wants distance from fudged earlier vbl_start */
- 
 
 1634 
		*vpos -= vbl_start;
- 
 
 1635 
		return ret;
1597 
		in_vbl = false;
 1636 
	}
1598 
 
 1637 
 
1599 
	/* Check if inside vblank area and apply corrective offsets:
 1638 
	/* Check if inside vblank area and apply corrective offsets:
1600 
	 * vpos will then be >=0 in video scanout area, but negative
 1639 
	 * vpos will then be >=0 in video scanout area, but negative
1601 
	 * within vblank area, counting down the number of lines until
 1640 
	 * within vblank area, counting down the number of lines until
Line 1609... Line 1648...
1609 
	}
 1648 
	}
Line 1610... Line 1649...
1610 
 
 1649 
 
1611 
	/* Correct for shifted end of vbl at vbl_end. */
 1650 
	/* Correct for shifted end of vbl at vbl_end. */
Line 1612... Line -...
1612 
	*vpos = *vpos - vbl_end;
 - 
 
1613 
 
 - 
 
1614 
	/* In vblank? */
 - 
 
1615 
	if (in_vbl)
 - 
 
1616 
		ret |= DRM_SCANOUTPOS_IN_VBLANK;
 - 
 
1617 
 
 - 
 
1618 
	/* Is vpos outside nominal vblank area, but less than
 - 
 
1619 
	 * 1/100 of a frame height away from start of vblank?
 - 
 
1620 
	 * If so, assume this isn't a massively delayed vblank
 - 
 
1621 
	 * interrupt, but a vblank interrupt that fired a few
 - 
 
1622 
	 * microseconds before true start of vblank. Compensate
 - 
 
1623 
	 * by adding a full frame duration to the final timestamp.
 - 
 
1624 
	 * Happens, e.g., on ATI R500, R600.
 - 
 
1625 
	 *
 - 
 
1626 
	 * We only do this if DRM_CALLED_FROM_VBLIRQ.
 - 
 
1627 
	 */
 - 
 
1628 
	if ((flags & DRM_CALLED_FROM_VBLIRQ) && !in_vbl) {
 - 
 
1629 
		vbl_start = mode->crtc_vdisplay;
 - 
 
1630 
		vtotal = mode->crtc_vtotal;
 - 
 
1631 
 
 - 
 
1632 
		if (vbl_start - *vpos < vtotal / 100) {
 - 
 
1633 
			*vpos -= vtotal;
 - 
 
1634 
 
 - 
 
1635 
			/* Signal this correction as "applied". */
 - 
 
1636 
			ret |= 0x8;
 - 
 
1637 
		}
 - 
 
1638 
	}
 1651 
	*vpos = *vpos - vbl_end;
1639 
 
 1652