1 files changed, 8 insertions, 120 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c
index 8a84a31c7..25593f6aa 100644
--- a/drivers/gpu/drm/i915/display/intel_crtc.c
+++ b/drivers/gpu/drm/i915/display/intel_crtc.c
@@ -461,70 +461,6 @@ int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
 			    1000 * adjusted_mode->crtc_htotal);
 }
 
-static int intel_mode_vblank_start(const struct drm_display_mode *mode)
-{
-	int vblank_start = mode->crtc_vblank_start;
-
-	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
-		vblank_start = DIV_ROUND_UP(vblank_start, 2);
-
-	return vblank_start;
-}
-
-static void intel_crtc_vblank_evade_scanlines(struct intel_atomic_state *state,
-					      struct intel_crtc *crtc,
-					      int *min, int *max, int *vblank_start)
-{
-	const struct intel_crtc_state *old_crtc_state =
-		intel_atomic_get_old_crtc_state(state, crtc);
-	const struct intel_crtc_state *new_crtc_state =
-		intel_atomic_get_new_crtc_state(state, crtc);
-	const struct intel_crtc_state *crtc_state;
-	const struct drm_display_mode *adjusted_mode;
-
-	/*
-	 * During fastsets/etc. the transcoder is still
-	 * running with the old timings at this point.
-	 *
-	 * TODO: maybe just use the active timings here?
-	 */
-	if (intel_crtc_needs_modeset(new_crtc_state))
-		crtc_state = new_crtc_state;
-	else
-		crtc_state = old_crtc_state;
-
-	adjusted_mode = &crtc_state->hw.adjusted_mode;
-
-	if (crtc->mode_flags & I915_MODE_FLAG_VRR) {
-		/* timing changes should happen with VRR disabled */
-		drm_WARN_ON(state->base.dev, intel_crtc_needs_modeset(new_crtc_state) ||
-			    new_crtc_state->update_m_n || new_crtc_state->update_lrr);
-
-		if (intel_vrr_is_push_sent(crtc_state))
-			*vblank_start = intel_vrr_vmin_vblank_start(crtc_state);
-		else
-			*vblank_start = intel_vrr_vmax_vblank_start(crtc_state);
-	} else {
-		*vblank_start = intel_mode_vblank_start(adjusted_mode);
-	}
-
-	/* FIXME needs to be calibrated sensibly */
-	*min = *vblank_start - intel_usecs_to_scanlines(adjusted_mode,
-							VBLANK_EVASION_TIME_US);
-	*max = *vblank_start - 1;
-
-	/*
-	 * M/N and TRANS_VTOTAL are double buffered on the transcoder's
-	 * undelayed vblank, so with seamless M/N and LRR we must evade
-	 * both vblanks.
-	 *
-	 * DSB execution waits for the transcoder's undelayed vblank,
-	 * hence we must kick off the commit before that.
-	 */
-	if (new_crtc_state->dsb || new_crtc_state->update_m_n || new_crtc_state->update_lrr)
-		*min -= adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay;
-}
-
 /**
  * intel_pipe_update_start() - start update of a set of display registers
  * @state: the atomic state
@@ -542,14 +478,12 @@ void intel_pipe_update_start(struct intel_atomic_state *state,
 			     struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
 	struct intel_crtc_state *new_crtc_state =
 		intel_atomic_get_new_crtc_state(state, crtc);
-	long timeout = msecs_to_jiffies_timeout(1);
-	int scanline, min, max, vblank_start;
-	wait_queue_head_t *wq = drm_crtc_vblank_waitqueue(&crtc->base);
-	bool need_vlv_dsi_wa = (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
-		intel_crtc_has_type(new_crtc_state, INTEL_OUTPUT_DSI);
-	DEFINE_WAIT(wait);
+	struct intel_vblank_evade_ctx evade;
+	int scanline;
 
 	intel_psr_lock(new_crtc_state);
 
@@ -566,9 +500,7 @@ void intel_pipe_update_start(struct intel_atomic_state *state,
 	if (intel_crtc_needs_vblank_work(new_crtc_state))
 		intel_crtc_vblank_work_init(new_crtc_state);
 
-	intel_crtc_vblank_evade_scanlines(state, crtc, &min, &max, &vblank_start);
-	if (min <= 0 || max <= 0)
-		goto irq_disable;
+	intel_vblank_evade_init(old_crtc_state, new_crtc_state, &evade);
 
 	if (drm_WARN_ON(&dev_priv->drm, drm_crtc_vblank_get(&crtc->base)))
 		goto irq_disable;
@@ -582,58 +514,14 @@ void intel_pipe_update_start(struct intel_atomic_state *state,
 
 	local_irq_disable();
 
-	crtc->debug.min_vbl = min;
-	crtc->debug.max_vbl = max;
+	crtc->debug.min_vbl = evade.min;
+	crtc->debug.max_vbl = evade.max;
 	trace_intel_pipe_update_start(crtc);
 
-	for (;;) {
-		/*
-		 * prepare_to_wait() has a memory barrier, which guarantees
-		 * other CPUs can see the task state update by the time we
-		 * read the scanline.
-		 */
-		prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
-
-		scanline = intel_get_crtc_scanline(crtc);
-		if (scanline < min || scanline > max)
-			break;
-
-		if (!timeout) {
-			drm_err(&dev_priv->drm,
-				"Potential atomic update failure on pipe %c\n",
-				pipe_name(crtc->pipe));
-			break;
-		}
-
-		local_irq_enable();
-
-		timeout = schedule_timeout(timeout);
-
-		local_irq_disable();
-	}
-
-	finish_wait(wq, &wait);
+	scanline = intel_vblank_evade(&evade);
 
 	drm_crtc_vblank_put(&crtc->base);
 
-	/*
-	 * On VLV/CHV DSI the scanline counter would appear to
-	 * increment approx. 1/3 of a scanline before start of vblank.
-	 * The registers still get latched at start of vblank however.
-	 * This means we must not write any registers on the first
-	 * line of vblank (since not the whole line is actually in
-	 * vblank). And unfortunately we can't use the interrupt to
-	 * wait here since it will fire too soon. We could use the
-	 * frame start interrupt instead since it will fire after the
-	 * critical scanline, but that would require more changes
-	 * in the interrupt code. So for now we'll just do the nasty
-	 * thing and poll for the bad scanline to pass us by.
-	 *
-	 * FIXME figure out if BXT+ DSI suffers from this as well
-	 */
-	while (need_vlv_dsi_wa && scanline == vblank_start)
-		scanline = intel_get_crtc_scanline(crtc);
-
 	crtc->debug.scanline_start = scanline;
 	crtc->debug.start_vbl_time = ktime_get();
 	crtc->debug.start_vbl_count = intel_crtc_get_vblank_counter(crtc);