From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Add a helper to convert our idea of a scanline to the hw's idea
of the same scanline (ie. apply crtc->scanline_offset in reverse).
We'll need this to tell the DSB do stuff on a specific scanline.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_vblank.c | 14 ++++++++++++++
drivers/gpu/drm/i915/display/intel_vblank.h | 1 +
2 files changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_vblank.c b/drivers/gpu/drm/i915/display/intel_vblank.c
index f5659ebd08eb..2cec2abf9746 100644
--- a/drivers/gpu/drm/i915/display/intel_vblank.c
+++ b/drivers/gpu/drm/i915/display/intel_vblank.c
@@ -251,6 +251,20 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
return (position + crtc->scanline_offset) % vtotal;
}
+int intel_crtc_scanline_to_hw(struct intel_crtc *crtc, int scanline)
+{
+ const struct drm_vblank_crtc *vblank =
+ &crtc->base.dev->vblank[drm_crtc_index(&crtc->base)];
+ const struct drm_display_mode *mode = &vblank->hwmode;
+ int vtotal;
+
+ vtotal = mode->crtc_vtotal;
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+ vtotal /= 2;
+
+ return (scanline + vtotal - crtc->scanline_offset) % vtotal;
+}
+
static bool i915_get_crtc_scanoutpos(struct drm_crtc *_crtc,
bool in_vblank_irq,
int *vpos, int *hpos,
diff --git a/drivers/gpu/drm/i915/display/intel_vblank.h b/drivers/gpu/drm/i915/display/intel_vblank.h
index 08e706b29149..17636f140c71 100644
--- a/drivers/gpu/drm/i915/display/intel_vblank.h
+++ b/drivers/gpu/drm/i915/display/intel_vblank.h
@@ -22,5 +22,6 @@ void intel_wait_for_pipe_scanline_stopped(struct intel_crtc *crtc);
void intel_wait_for_pipe_scanline_moving(struct intel_crtc *crtc);
void intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state,
bool vrr_enable);
+int intel_crtc_scanline_to_hw(struct intel_crtc *crtc, int scanline);
#endif /* __INTEL_VBLANK_H__ */
--
2.39.3
