[PATCH v3.5 16.5/22] drm/i915: Make intel_display_suspend atomic.

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Calculate all state using a normal transition, but afterwards fudge
crtc->state->active back to its old value. This should still allow
state restore in setup_hw_state to work properly.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 47 +++++++++++++++++++++++++++++++++---
 1 file changed, 43 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8b1d91136d25..2dc59147d890 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5951,16 +5951,55 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
  */
 void intel_display_suspend(struct drm_device *dev)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct drm_mode_config *config = &dev->mode_config;
+	struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
+	struct drm_atomic_state *state;
 	struct drm_crtc *crtc;
+	unsigned crtc_mask = 0;
+	int ret = 0;
+
+	if (WARN_ON(!ctx))
+		return;
+
+	lockdep_assert_held(&ctx->ww_ctx);
+	state = drm_atomic_state_alloc(dev);
+	if (WARN_ON(!state))
+		return;
+
+	state->acquire_ctx = ctx;
+	state->allow_modeset = true;
 
 	for_each_crtc(dev, crtc) {
-		if (!to_intel_crtc(crtc)->active)
+		struct drm_crtc_state *crtc_state =
+			drm_atomic_get_crtc_state(state, crtc);
+
+		ret = PTR_ERR_OR_ZERO(crtc_state);
+		if (ret)
+			goto free;
+
+		if (!crtc_state->active)
 			continue;
 
-		intel_crtc_disable_planes(crtc);
-		dev_priv->display.crtc_disable(crtc);
+		crtc_state->active = false;
+		crtc_mask |= 1 << drm_crtc_index(crtc);
 	}
+
+	if (crtc_mask) {
+		ret = intel_set_mode(state);
+
+		if (!ret) {
+			for_each_crtc(dev, crtc)
+				if (crtc_mask & (1 << drm_crtc_index(crtc)))
+					crtc->state->active = true;
+
+			return;
+		}
+	}
+
+free:
+	if (ret)
+		DRM_ERROR("Suspending crtc's failed with %i\n", ret);
+	drm_atomic_state_free(state);
 }
 
 /* Master function to enable/disable CRTC and corresponding power wells */
-- 
2.1.0


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