[Intel-gfx] [RFC v2 1/1] drm/i915: Power gating display wells during i915_pm_suspend

[sagar.a.kamble at intel.com]

From: Borun Fu <borun.fu at intel.com>

On VLV, after i915_pm_suspend display power wells are staying
power ungated. So, after initiating mem sleep "echo mem > /sys/power/state"
Display is staing D0 State. There might be better way/place to power gate
these wells. Also, we need to make sure that if wells are power gated due to
DPMS OFF sequence, they need not be turned off by i915_pm_suspend again.

v2: Extracted helper for intel_crtc_disable and power gating CRTC power wells.
[Daniel]

Cc: Imre Deak <imre.deak at intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Change-Id: I34c80da66aa24c423a5576c68aa1f3a8d0f43848
Signed-off-by: Sagar Kamble <sagar.a.kamble at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c      |  7 +++----
 drivers/gpu/drm/i915/i915_drv.h      |  4 ++++
 drivers/gpu/drm/i915/intel_display.c | 30 +++++++++++++++++-------------
 drivers/gpu/drm/i915/intel_drv.h     |  1 +
 4 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 83cb43a..5e4fefd 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -524,12 +524,11 @@ static int i915_drm_freeze(struct drm_device *dev)
 
 		/*
 		 * Disable CRTCs directly since we want to preserve sw state
-		 * for _thaw.
+		 * for _thaw. Also, power gate the CRTC power wells.
 		 */
 		drm_modeset_lock_all(dev);
-		for_each_crtc(dev, crtc) {
-			dev_priv->display.crtc_disable(crtc);
-		}
+		for_each_crtc(dev, crtc)
+			intel_crtc_control(crtc, false);
 		drm_modeset_unlock_all(dev);
 
 		intel_modeset_suspend_hw(dev);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a89c912..54f98d3 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -179,6 +179,10 @@ enum hpd_pin {
 	list_for_each_entry((intel_connector), &(dev)->mode_config.connector_list, base.head) \
 		if ((intel_connector)->base.encoder == (__encoder))
 
+#define for_each_power_domain(domain, mask)				\
+	for ((domain) = 0; (domain) < POWER_DOMAIN_NUM; (domain)++)	\
+		if ((1 << (domain)) & (mask))
+
 struct drm_i915_private;
 struct i915_mmu_object;
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fe6f1db..7a1f14f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4300,10 +4300,6 @@ static void i9xx_pfit_enable(struct intel_crtc *crtc)
 	I915_WRITE(BCLRPAT(crtc->pipe), 0);
 }
 
-#define for_each_power_domain(domain, mask)				\
-	for ((domain) = 0; (domain) < POWER_DOMAIN_NUM; (domain)++)	\
-		if ((1 << (domain)) & (mask))
-
 enum intel_display_power_domain
 intel_display_port_power_domain(struct intel_encoder *intel_encoder)
 {
@@ -4872,21 +4868,14 @@ static void intel_crtc_update_sarea(struct drm_crtc *crtc,
 	}
 }
 
-/**
- * Sets the power management mode of the pipe and plane.
- */
-void intel_crtc_update_dpms(struct drm_crtc *crtc)
+/* Master function to enable/disable CRTC and corresponding power wells */
+void intel_crtc_control(struct drm_crtc *crtc, bool enable)
 {
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	struct intel_encoder *intel_encoder;
 	enum intel_display_power_domain domain;
 	unsigned long domains;
-	bool enable = false;
-
-	for_each_encoder_on_crtc(dev, crtc, intel_encoder)
-		enable |= intel_encoder->connectors_active;
 
 	if (enable) {
 		if (!intel_crtc->active) {
@@ -4907,6 +4896,21 @@ void intel_crtc_update_dpms(struct drm_crtc *crtc)
 			intel_crtc->enabled_power_domains = 0;
 		}
 	}
+}
+
+/**
+ * Sets the power management mode of the pipe and plane.
+ */
+void intel_crtc_update_dpms(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct intel_encoder *intel_encoder;
+	bool enable = false;
+
+	for_each_encoder_on_crtc(dev, crtc, intel_encoder)
+		enable |= intel_encoder->connectors_active;
+
+	intel_crtc_control(crtc, enable);
 
 	intel_crtc_update_sarea(crtc, enable);
 }
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 016d894..4c24f88 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -755,6 +755,7 @@ void intel_frontbuffer_flip(struct drm_device *dev,
 void intel_fb_obj_flush(struct drm_i915_gem_object *obj, bool retire);
 void intel_mark_idle(struct drm_device *dev);
 void intel_crtc_restore_mode(struct drm_crtc *crtc);
+void 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);
 void intel_connector_dpms(struct drm_connector *, int mode);
-- 
1.8.5