[PATCH 11/14] drm: Fix vblank timestamping constants for interlaced modes

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We're currently miscalculating the line and pixel durations for
interlaced modes. crtc_htotal and crtc_vtotal are the full frame
timings, and so is crtc_clock, so we can compute the line
and pixel durations from those w/o any extra adjustments. But
we actually want framedur_ns to be the field, not frame, duration,
so we must divide it by two.

This should make the scanout based vblank timestamp corrections
work correctly with interlaced modes, at least for i915. It all
depends whether we keep the field or frame timings in the display
mode crtc_ timings.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/drm_irq.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index b21a226..b5c4d42 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -453,12 +453,6 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc,
 	int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
 	int dotclock = mode->crtc_clock;
 
-	/* Fields of interlaced scanout modes are only halve a frame duration.
-	 * Double the dotclock to get halve the frame-/line-/pixelduration.
-	 */
-	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
-		dotclock *= 2;
-
 	/* Valid dotclock? */
 	if (dotclock > 0) {
 		int frame_size = mode->crtc_htotal * mode->crtc_vtotal;
@@ -471,6 +465,12 @@ void drm_calc_timestamping_constants(struct drm_crtc *crtc,
 		pixeldur_ns = 1000000 / dotclock;
 		linedur_ns  = div_u64((u64) mode->crtc_htotal * 1000000, dotclock);
 		framedur_ns = div_u64((u64) frame_size * 1000000, dotclock);
+
+		/*
+		 * Fields of interlaced scanout modes are only halve a frame duration.
+		 */
+		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+			framedur_ns /= 2;
 	} else
 		DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
 			  crtc->base.id);
-- 
1.8.1.5