[PATCH v3.5 02.5/22] drm/i915: add intel_display_suspend

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

This is a function used to disable all crtc's. This makes it clearer
to distinguish between when mode needs to be preserved and when
it can be trashed.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
Oops, I was trashing all state during suspend and on gpu reset.
I will send an amended intel_crtc_control patch too with the
suspend and prepare_reset parts taken out.

 drivers/gpu/drm/i915/i915_drv.c      |  4 +---
 drivers/gpu/drm/i915/intel_display.c | 29 +++++++++++++++++++----------
 drivers/gpu/drm/i915/intel_drv.h     |  1 +
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 5cc57f2ec192..d1a090a9f653 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -600,7 +600,6 @@ static int skl_resume_prepare(struct drm_i915_private *dev_priv);
 static int i915_drm_suspend(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct drm_crtc *crtc;
 	pci_power_t opregion_target_state;
 	int error;
 
@@ -631,8 +630,7 @@ static int i915_drm_suspend(struct drm_device *dev)
 	 * for _thaw. Also, power gate the CRTC power wells.
 	 */
 	drm_modeset_lock_all(dev);
-	for_each_crtc(dev, crtc)
-		intel_crtc_control(crtc, false);
+	intel_display_suspend(dev);
 	drm_modeset_unlock_all(dev);
 
 	intel_dp_mst_suspend(dev);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index cae36ec1c2ef..8d50c4ca561f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3204,9 +3204,6 @@ void intel_crtc_reset(struct intel_crtc *crtc)
 
 void intel_prepare_reset(struct drm_device *dev)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_crtc *crtc;
-
 	/* no reset support for gen2 */
 	if (IS_GEN2(dev))
 		return;
@@ -3221,13 +3218,7 @@ void intel_prepare_reset(struct drm_device *dev)
 	 * Disabling the crtcs gracefully seems nicer. Also the
 	 * g33 docs say we should at least disable all the planes.
 	 */
-	for_each_intel_crtc(dev, crtc) {
-		if (!crtc->active)
-			continue;
-
-		intel_crtc_disable_planes(&crtc->base);
-		dev_priv->display.crtc_disable(&crtc->base);
-	}
+	intel_display_suspend(dev);
 }
 
 void intel_finish_reset(struct drm_device *dev)
@@ -6018,6 +6009,24 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 	mutex_unlock(&dev->struct_mutex);
 }
 
+/*
+ * 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_i915_private *dev_priv = to_i915(dev);
+	struct drm_crtc *crtc;
+
+	for_each_crtc(dev, crtc) {
+		if (!to_intel_crtc(crtc)->active)
+			continue;
+
+		intel_crtc_disable_planes(crtc);
+		dev_priv->display.crtc_disable(crtc);
+	}
+}
+
 /* Master function to enable/disable CRTC and corresponding power wells */
 void intel_crtc_control(struct drm_crtc *crtc, bool enable)
 {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 70d0cc8fe70e..c24d670529e3 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -992,6 +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);
 void intel_crtc_control(struct drm_crtc *crtc, bool enable);
 void intel_crtc_reset(struct intel_crtc *crtc);
 void intel_crtc_update_dpms(struct drm_crtc *crtc);
-- 
2.1.0


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