[PATCH 13/18] 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.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90396
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 52 +++++++++++++++++++++++++++++++++---
 drivers/gpu/drm/i915/intel_drv.h     |  2 +-
 2 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 458393df4630..d77846a23d18 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6227,12 +6227,58 @@ 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.
  */
-void intel_display_suspend(struct drm_device *dev)
+int intel_display_suspend(struct drm_device *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 0;
+
+	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);
 
-	for_each_crtc(dev, crtc)
-		intel_crtc_disable_noatomic(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);
+	}
+
+	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 ret;
+		}
+	}
+
+free:
+	if (ret)
+		DRM_ERROR("Suspending crtc's failed with %i\n", ret);
+	drm_atomic_state_free(state);
+	return ret;
 }
 
 /* Master function to enable/disable CRTC and corresponding power wells */
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index f7e729232f03..c19eb5dc2832 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -993,7 +993,7 @@ 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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