Commit 77d82856 authored by Ville Syrjälä's avatar Ville Syrjälä
Browse files

drm/i915: Introduce intel_crtc_scanline_to_hw() 



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: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230606191504.18099-17-ville.syrjala@linux.intel.com


Reviewed-by: default avatarUma Shankar <uma.shankar@intel.com>
parent b4283282

drivers/gpu/drm/i915/display/intel_vblank.c

+14 −0
Original line number Diff line number Diff line
@@ -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,

drivers/gpu/drm/i915/display/intel_vblank.h

+1 −0
Original line number Diff line number Diff line
@@ -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__ */