drm/i915/skl: init/uninit display core as part of the HW power domain state

We need to initialize the display core part early, before initializing
the rest of the display power state. This is also described in the bspec
termed "Display initialization sequence". Atm we run this sequence
during driver loading after power domain HW state initialization which
is too late and during runtime suspend/resume which is unneeded and can
interere with DMC functionality which handles HW resources toggled
by this init/uninit sequence automatically. The init sequence must be
run as the first step of HW power state initialization and during
system resume. The uninit sequence must be run during system suspend.

To address the above move the init sequence to the initial HW power
state setup and the uninit sequence to a new power domains suspend
function called during system suspend.

As part of the init sequence we also have to reprogram the DMC firmware
as it's lost across a system suspend/resume cycle.

After this change CD clock initialization during driver loading will
happen only later after other dependent HW/SW parts are initialized,
while during system resume it will get initialized as the last step of
the init sequence. This distinction can be removed by some refactoring
of platform independent parts. I left this refactoring out from this
series since I didn't want to change non-SKL parts. This is a TODO for
later.

v2:
- fix error path in i915_drm_suspend_late()
- don't try to re-program the DMC firmware if it failed to load
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447774433-20834-1-git-send-email-imre.deak@intel.com

drivers/gpu/drm/i915/i915_dma.c

@@ -424,7 +424,7 @@ static int i915_load_modeset_init(struct drm_device *dev)
 	if (ret)
 		goto cleanup_vga_switcheroo;
 
-	intel_power_domains_init_hw(dev_priv);
+	intel_power_domains_init_hw(dev_priv, false);
 
 	intel_csr_ucode_init(dev_priv);
 

drivers/gpu/drm/i915/i915_drv.c

@@ -704,10 +704,13 @@ static int i915_drm_suspend_late(struct drm_device *drm_dev, bool hibernation)
 	struct drm_i915_private *dev_priv = drm_dev->dev_private;
 	int ret;
 
+	intel_power_domains_suspend(dev_priv);
+
 	ret = intel_suspend_complete(dev_priv);
 
 	if (ret) {
 		DRM_ERROR("Suspend complete failed: %d\n", ret);
+		intel_power_domains_init_hw(dev_priv, true);
 
 		return ret;
 	}
@@ -861,7 +864,7 @@ static int i915_drm_resume_early(struct drm_device *dev)
 		hsw_disable_pc8(dev_priv);
 
 	intel_uncore_sanitize(dev);
-	intel_power_domains_init_hw(dev_priv);
+	intel_power_domains_init_hw(dev_priv, true);
 
 	return ret;
 }
@@ -1070,8 +1073,6 @@ static int i915_pm_resume(struct device *dev)
 
 static int skl_suspend_complete(struct drm_i915_private *dev_priv)
 {
-	skl_uninit_cdclk(dev_priv);
-
 	if (dev_priv->csr.dmc_payload)
 		skl_enable_dc6(dev_priv);
 
@@ -1122,9 +1123,6 @@ static int skl_resume_prepare(struct drm_i915_private *dev_priv)
 	if (dev_priv->csr.dmc_payload)
 		skl_disable_dc6(dev_priv);
 
-	skl_init_cdclk(dev_priv);
-	intel_csr_load_program(dev_priv);
-
 	return 0;
 }
 

drivers/gpu/drm/i915/intel_display.c

@@ -5712,23 +5712,12 @@ void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
 		if (wait_for(!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_LOCK), 1))
 			DRM_ERROR("Couldn't disable DPLL0\n");
 	}
-
-	/* disable PG1 and Misc I/O */
-	skl_pw1_misc_io_fini(dev_priv);
 }
 
 void skl_init_cdclk(struct drm_i915_private *dev_priv)
 {
-	u32 val;
 	unsigned int required_vco;
 
-	/* enable PCH reset handshake */
-	val = I915_READ(HSW_NDE_RSTWRN_OPT);
-	I915_WRITE(HSW_NDE_RSTWRN_OPT, val | RESET_PCH_HANDSHAKE_ENABLE);
-
-	/* enable PG1 and Misc I/O */
-	skl_pw1_misc_io_init(dev_priv);
-
 	/* DPLL0 not enabled (happens on early BIOS versions) */
 	if (!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_ENABLE)) {
 		/* enable DPLL0 */

drivers/gpu/drm/i915/intel_drv.h

@@ -1412,7 +1412,8 @@ void intel_psr_single_frame_update(struct drm_device *dev,
 /* intel_runtime_pm.c */
 int intel_power_domains_init(struct drm_i915_private *);
 void intel_power_domains_fini(struct drm_i915_private *);
-void intel_power_domains_init_hw(struct drm_i915_private *dev_priv);
+void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume);
+void intel_power_domains_suspend(struct drm_i915_private *dev_priv);
 void skl_pw1_misc_io_init(struct drm_i915_private *dev_priv);
 void skl_pw1_misc_io_fini(struct drm_i915_private *dev_priv);
 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv);

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -1903,6 +1903,43 @@ static void intel_power_domains_sync_hw(struct drm_i915_private *dev_priv)
 	mutex_unlock(&power_domains->lock);
 }
 
+static void skl_display_core_init(struct drm_i915_private *dev_priv,
+				  bool resume)
+{
+	struct i915_power_domains *power_domains = &dev_priv->power_domains;
+	uint32_t val;
+
+	/* enable PCH reset handshake */
+	val = I915_READ(HSW_NDE_RSTWRN_OPT);
+	I915_WRITE(HSW_NDE_RSTWRN_OPT, val | RESET_PCH_HANDSHAKE_ENABLE);
+
+	/* enable PG1 and Misc I/O */
+	mutex_lock(&power_domains->lock);
+	skl_pw1_misc_io_init(dev_priv);
+	mutex_unlock(&power_domains->lock);
+
+	if (!resume)
+		return;
+
+	skl_init_cdclk(dev_priv);
+
+	if (dev_priv->csr.dmc_payload)
+		intel_csr_load_program(dev_priv);
+}
+
+static void skl_display_core_uninit(struct drm_i915_private *dev_priv)
+{
+	struct i915_power_domains *power_domains = &dev_priv->power_domains;
+
+	skl_uninit_cdclk(dev_priv);
+
+	/* The spec doesn't call for removing the reset handshake flag */
+	/* disable PG1 and Misc I/O */
+	mutex_lock(&power_domains->lock);
+	skl_pw1_misc_io_fini(dev_priv);
+	mutex_unlock(&power_domains->lock);
+}
+
 static void chv_phy_control_init(struct drm_i915_private *dev_priv)
 {
 	struct i915_power_well *cmn_bc =
@@ -2025,14 +2062,16 @@ static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
  * This function initializes the hardware power domain state and enables all
  * power domains using intel_display_set_init_power().
  */
-void intel_power_domains_init_hw(struct drm_i915_private *dev_priv)
+void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
 {
 	struct drm_device *dev = dev_priv->dev;
 	struct i915_power_domains *power_domains = &dev_priv->power_domains;
 
 	power_domains->initializing = true;
 
-	if (IS_CHERRYVIEW(dev)) {
+	if (IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) {
+		skl_display_core_init(dev_priv, resume);
+	} else if (IS_CHERRYVIEW(dev)) {
 		mutex_lock(&power_domains->lock);
 		chv_phy_control_init(dev_priv);
 		mutex_unlock(&power_domains->lock);
@@ -2048,6 +2087,19 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv)
 	power_domains->initializing = false;
 }
 
+/**
+ * intel_power_domains_suspend - suspend power domain state
+ * @dev_priv: i915 device instance
+ *
+ * This function prepares the hardware power domain state before entering
+ * system suspend. It must be paired with intel_power_domains_init_hw().
+ */
+void intel_power_domains_suspend(struct drm_i915_private *dev_priv)
+{
+	if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
+		skl_display_core_uninit(dev_priv);
+}
+
 /**
  * intel_aux_display_runtime_get - grab an auxiliary power domain reference
  * @dev_priv: i915 device instance