We skip src trunction/adjustments for
NV12 case and handle the sizes directly.
Without this, pipe fifo underruns are seen on APL/KBL.

Credits-to: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Signed-off-by: Vidya Srinivas <vidya.srini...@intel.com>
---
 drivers/gpu/drm/i915/intel_sprite.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_sprite.c 
b/drivers/gpu/drm/i915/intel_sprite.c
index d5dad44..89845d5 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -1015,6 +1015,9 @@ intel_check_sprite_plane(struct intel_plane *plane,
        crtc_w = drm_rect_width(dst);
        crtc_h = drm_rect_height(dst);
 
+       if (fb->format->format == DRM_FORMAT_NV12)
+               goto check_plane_surface;
+
        if (state->base.visible) {
                /* check again in case clipping clamped the results */
                hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
@@ -1112,6 +1115,7 @@ intel_check_sprite_plane(struct intel_plane *plane,
        dst->y1 = crtc_y;
        dst->y2 = crtc_y + crtc_h;
 
+check_plane_surface:
        if (INTEL_GEN(dev_priv) >= 9) {
                ret = skl_check_plane_surface(crtc_state, state);
                if (ret)
-- 
2.7.4

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