drm/i915: Improve gen3/4 frame counter

Currently the logic to fix up the frame counter on gen3/4 assumes that
start of vblank occurs at vblank_start*htotal pixels, when in fact
it occurs htotal-hsync_start pixels earlier. Apply the appropriate
adjustment to make the frame counter more accurate.

Also fix the vblank start position for interlaced display modes.

Reviewed-by: Imre Deak <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: "Akash Goel <[email protected]>"
Reviewed-by: "Sourab Gupta <[email protected]>"
Signed-off-by: Daniel Vetter <[email protected]>

0 files changed, 0 insertions, 0 deletions