From 5b9489cb8ee23b41ab5a4cca6652511fa252bad8 Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date: Wed, 15 Nov 2017 17:31:56 +0100
Subject: [PATCH] drm/i915: Calculate vlv/chv intermediate watermarks correctly, v3.
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Git-commit: 5b9489cb8ee23b41ab5a4cca6652511fa252bad8
Patch-mainline: v4.16-rc1
References: FATE#322643 bsc#1055900

The watermarks it should calculate against are the old optimal watermarks.
The currently active crtc watermarks are pure fiction, and are invalid in
case of a nonblocking modeset, page flip enabling/disabling planes or any
other reason.

When the crtc is disabled or during a modeset the intermediate watermarks
don't need to be programmed separately, and could be directly assigned
to the optimal watermarks.

CXSR must always be disabled in the intermediate case for modesets, else
we get a WARN for vblank wait timeout.

Also rename crtc_state to new_crtc_state, to distinguish it from the old state.

Changes since v1:
- Use intel_atomic_get_old_crtc_state. (ville)
Changes since v2:
- Always unset cxsr during modeset.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115163157.14372-1-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_pm.c |   24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2020,16 +2020,27 @@ static void vlv_atomic_update_fifo(struc
 
 static int vlv_compute_intermediate_wm(struct drm_device *dev,
 				       struct intel_crtc *crtc,
-				       struct intel_crtc_state *crtc_state)
+				       struct intel_crtc_state *new_crtc_state)
 {
-	struct vlv_wm_state *intermediate = &crtc_state->wm.vlv.intermediate;
-	const struct vlv_wm_state *optimal = &crtc_state->wm.vlv.optimal;
-	const struct vlv_wm_state *active = &crtc->wm.active.vlv;
+	struct vlv_wm_state *intermediate = &new_crtc_state->wm.vlv.intermediate;
+	const struct vlv_wm_state *optimal = &new_crtc_state->wm.vlv.optimal;
+	struct intel_atomic_state *intel_state =
+		to_intel_atomic_state(new_crtc_state->base.state);
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(intel_state, crtc);
+	const struct vlv_wm_state *active = &old_crtc_state->wm.vlv.optimal;
 	int level;
 
+	if (!new_crtc_state->base.active || drm_atomic_crtc_needs_modeset(&new_crtc_state->base)) {
+		*intermediate = *optimal;
+
+		intermediate->cxsr = false;
+		goto out;
+	}
+
 	intermediate->num_levels = min(optimal->num_levels, active->num_levels);
 	intermediate->cxsr = optimal->cxsr && active->cxsr &&
-		!crtc_state->disable_cxsr;
+		!new_crtc_state->disable_cxsr;
 
 	for (level = 0; level < intermediate->num_levels; level++) {
 		enum plane_id plane_id;
@@ -2048,12 +2059,13 @@ static int vlv_compute_intermediate_wm(s
 
 	vlv_invalidate_wms(crtc, intermediate, level);
 
+out:
 	/*
 	 * If our intermediate WM are identical to the final WM, then we can
 	 * omit the post-vblank programming; only update if it's different.
 	 */
 	if (memcmp(intermediate, optimal, sizeof(*intermediate)) != 0)
-		crtc_state->wm.need_postvbl_update = true;
+		new_crtc_state->wm.need_postvbl_update = true;
 
 	return 0;
 }