[RFC PATCH 7/7] drm/i915: Make intel_display_suspend atomic, try 2.

[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 | 74 +++++++++++++++++++++++-------------
 drivers/gpu/drm/i915/intel_drv.h     |  2 +-
 2 files changed, 49 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 796d08c4606e..9c25b080260c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6175,40 +6175,62 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 		intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
 }
 
-static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
+/*
+ * turn all crtc's off, but do not adjust state
+ * This has to be paired with a call to intel_modeset_setup_hw_state.
+ */
+int intel_display_suspend(struct drm_device *dev)
 {
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
-	enum intel_display_power_domain domain;
-	unsigned long domains;
+	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 (!intel_crtc->active)
-		return;
+	if (WARN_ON(!ctx))
+		return 0;
 
-	if (to_intel_plane_state(crtc->primary->state)->visible) {
-		intel_crtc_wait_for_pending_flips(crtc);
-		intel_pre_disable_primary(crtc);
+	lockdep_assert_held(&ctx->ww_ctx);
+	state = drm_atomic_state_alloc(dev);
+	if (WARN_ON(!state))
+		return -ENOMEM;
+
+	state->acquire_ctx = ctx;
+	state->allow_modeset = true;
+
+	for_each_crtc(dev, crtc) {
+		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;
+
+		crtc_state->active = false;
+		crtc_mask |= 1 << drm_crtc_index(crtc);
 	}
 
-	intel_crtc_disable_planes(crtc, crtc->state->plane_mask);
-	dev_priv->display.crtc_disable(crtc);
+	if (crtc_mask) {
+		ret = intel_set_mode(state);
 
-	domains = intel_crtc->enabled_power_domains;
-	for_each_power_domain(domain, domains)
-		intel_display_power_put(dev_priv, domain);
-	intel_crtc->enabled_power_domains = 0;
-}
+		if (!ret) {
+			for_each_crtc(dev, crtc)
+				if (crtc_mask & (1 << drm_crtc_index(crtc)))
+					crtc->state->active = true;
 
-/*
- * turn all crtc's off, but do not adjust state
- * This has to be paired with a call to intel_modeset_setup_hw_state.
- */
-void intel_display_suspend(struct drm_device *dev)
-{
-	struct drm_crtc *crtc;
+			return ret;
+		}
+	}
 
-	for_each_crtc(dev, crtc)
-		intel_crtc_disable_noatomic(crtc);
+free:
+	if (ret)
+		DRM_ERROR("Suspending crtc's failed with %i\n", ret);
+	drm_atomic_state_free(state);
+	return ret;
 }
 
 void intel_display_resume(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index ea380b83eb5d..fb6c88ade842 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -992,7 +992,7 @@ int intel_pch_rawclk(struct drm_device *dev);
 void intel_mark_busy(struct drm_device *dev);
 void intel_mark_idle(struct drm_device *dev);
 void intel_crtc_restore_mode(struct drm_crtc *crtc);
-void intel_display_suspend(struct drm_device *dev);
+int intel_display_suspend(struct drm_device *dev);
 int intel_crtc_control(struct drm_crtc *crtc, bool enable);
 void intel_crtc_update_dpms(struct drm_crtc *crtc);
 void intel_encoder_destroy(struct drm_encoder *encoder);
-- 
2.1.0

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