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drm/i915: Add a small adjustment to the pixel counter on interlaced modes 

In interlaced modes, the pixel counter counts all pixels,
so one field will have htotal more pixels. In order to avoid
the reported position from jumping backwards when the pixel
counter is beyond the length of the shorter field, just
clamp the position the length of the shorter field. This
matches how the scanline counter based position works since
the scanline counter doesn't count the two half lines.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: "Akash Goel <akash.goels@gmail.com>"
Reviewed-by: "Sourab Gupta <sourabgupta@gmail.com>"
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-04-29 13:35:49 +03:00 committed by Daniel Vetter
parent f7ef3fa77f
commit 7e78f1cb38
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/i915/i915_irq.c
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@ -914,6 +914,18 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
vbl_end *= htotal;
vtotal *= htotal;
/*
* In interlaced modes, the pixel counter counts all pixels,
* so one field will have htotal more pixels. In order to avoid
* the reported position from jumping backwards when the pixel
* counter is beyond the length of the shorter field, just
* clamp the position the length of the shorter field. This
* matches how the scanline counter based position works since
* the scanline counter doesn't count the two half lines.
*/
if (position >= vtotal)
position = vtotal - 1;
/*
* Start of vblank interrupt is triggered at start of hsync,
* just prior to the first active line of vblank. However we