drm/i915/bxt: Don't toggle power well 1 on-demand

Power well 1 is managed by the DMC firmware so don't toggle it on-demand
from the driver. This means we need to follow the BSpec display
initialization sequence during driver loading and resuming (both system
and runtime) and enable power well 1 only once there. Afterwards DMC
will toggle power well 1 whenever entering/exiting DC5.

For this to work we also need to do away getting the PLL power domain,
since that just kept runtime PM disabled for good.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459515767-29228-12-git-send-email-imre.deak@intel.com

drivers/gpu/drm/i915/i915_drv.c

@@ -1080,27 +1080,16 @@ static int hsw_suspend_complete(struct drm_i915_private *dev_priv)
 
 static int bxt_suspend_complete(struct drm_i915_private *dev_priv)
 {
-	/* TODO: when DC5 support is added disable DC5 here. */
-
-	broxton_ddi_phy_uninit(dev_priv);
-	broxton_uninit_cdclk(dev_priv);
+	bxt_display_core_uninit(dev_priv);
 	bxt_enable_dc9(dev_priv);
 
 	return 0;
 }
 
 static int bxt_resume_prepare(struct drm_i915_private *dev_priv)
 {
-	/* TODO: when CSR FW support is added make sure the FW is loaded */
-
 	bxt_disable_dc9(dev_priv);
-
-	/*
-	 * TODO: when DC5 support is added enable DC5 here if the CSR FW
-	 * is available.
-	 */
-	broxton_init_cdclk(dev_priv);
-	broxton_ddi_phy_init(dev_priv);
+	bxt_display_core_init(dev_priv, true);
 
 	return 0;
 }

drivers/gpu/drm/i915/intel_display.c

@@ -5448,21 +5448,6 @@ static void broxton_set_cdclk(struct drm_i915_private *dev_priv, int frequency)
 
 void broxton_init_cdclk(struct drm_i915_private *dev_priv)
 {
-	uint32_t val;
-
-	/*
-	 * NDE_RSTWRN_OPT RST PCH Handshake En must always be 0b on BXT
-	 * or else the reset will hang because there is no PCH to respond.
-	 * Move the handshake programming to initialization sequence.
-	 * Previously was left up to BIOS.
-	 */
-	val = I915_READ(HSW_NDE_RSTWRN_OPT);
-	val &= ~RESET_PCH_HANDSHAKE_ENABLE;
-	I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
-
-	/* Enable PG1 for cdclk */
-	intel_display_power_get(dev_priv, POWER_DOMAIN_PLLS);
-
 	/* check if cd clock is enabled */
 	if (I915_READ(BXT_DE_PLL_ENABLE) & BXT_DE_PLL_PLL_ENABLE) {
 		DRM_DEBUG_KMS("Display already initialized\n");
@@ -5499,8 +5484,6 @@ void broxton_uninit_cdclk(struct drm_i915_private *dev_priv)
 
 	/* Set minimum (bypass) frequency, in effect turning off the DE PLL */
 	broxton_set_cdclk(dev_priv, 19200);
-
-	intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS);
 }
 
 static const struct skl_cdclk_entry {

drivers/gpu/drm/i915/intel_dpll_mgr.c

@@ -1652,10 +1652,7 @@ static void intel_ddi_pll_init(struct drm_device *dev)
 			DRM_DEBUG_KMS("Sanitized cdclk programmed by pre-os\n");
 		if (!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_ENABLE))
 			DRM_ERROR("LCPLL1 is disabled\n");
-	} else if (IS_BROXTON(dev)) {
-		broxton_init_cdclk(dev_priv);
-		broxton_ddi_phy_init(dev_priv);
-	} else {
+	} else if (!IS_BROXTON(dev_priv)) {
 		/*
 		 * The LCPLL register should be turned on by the BIOS. For now
 		 * let's just check its state and print errors in case

drivers/gpu/drm/i915/intel_drv.h

@@ -1462,6 +1462,8 @@ 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, bool resume);
 void intel_power_domains_suspend(struct drm_i915_private *dev_priv);
+void bxt_display_core_init(struct drm_i915_private *dev_priv, bool resume);
+void bxt_display_core_uninit(struct drm_i915_private *dev_priv);
 void intel_runtime_pm_enable(struct drm_i915_private *dev_priv);
 const char *
 intel_display_power_domain_str(enum intel_display_power_domain domain);

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -419,25 +419,13 @@ static void hsw_set_power_well(struct drm_i915_private *dev_priv,
 	BIT(POWER_DOMAIN_VGA) |				\
 	BIT(POWER_DOMAIN_GMBUS) |			\
 	BIT(POWER_DOMAIN_INIT))
-#define BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS (		\
-	BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS |		\
-	BIT(POWER_DOMAIN_PIPE_A) |			\
-	BIT(POWER_DOMAIN_TRANSCODER_EDP) |		\
-	BIT(POWER_DOMAIN_TRANSCODER_DSI_A) |		\
-	BIT(POWER_DOMAIN_TRANSCODER_DSI_C) |		\
-	BIT(POWER_DOMAIN_PIPE_A_PANEL_FITTER) |		\
-	BIT(POWER_DOMAIN_PORT_DDI_A_LANES) |		\
-	BIT(POWER_DOMAIN_PORT_DSI) |			\
-	BIT(POWER_DOMAIN_AUX_A) |			\
-	BIT(POWER_DOMAIN_PLLS) |			\
-	BIT(POWER_DOMAIN_INIT))
 #define BXT_DISPLAY_DC_OFF_POWER_DOMAINS (		\
 	BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS |		\
 	BIT(POWER_DOMAIN_MODESET) |			\
 	BIT(POWER_DOMAIN_AUX_A) |			\
 	BIT(POWER_DOMAIN_INIT))
 #define BXT_DISPLAY_ALWAYS_ON_POWER_DOMAINS (		\
-	(POWER_DOMAIN_MASK & ~(BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS |	\
+	(POWER_DOMAIN_MASK & ~(				\
 	BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) |	\
 	BIT(POWER_DOMAIN_INIT))
 
@@ -1945,7 +1933,7 @@ static struct i915_power_well bxt_power_wells[] = {
 	},
 	{
 		.name = "power well 1",
-		.domains = BXT_DISPLAY_POWERWELL_1_POWER_DOMAINS,
+		.domains = 0,
 		.ops = &skl_power_well_ops,
 		.data = SKL_DISP_PW_1,
 	},
@@ -2181,6 +2169,61 @@ static void skl_display_core_uninit(struct drm_i915_private *dev_priv)
 	mutex_unlock(&power_domains->lock);
 }
 
+void bxt_display_core_init(struct drm_i915_private *dev_priv,
+			   bool resume)
+{
+	struct i915_power_domains *power_domains = &dev_priv->power_domains;
+	struct i915_power_well *well;
+	uint32_t val;
+
+	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+
+	/*
+	 * NDE_RSTWRN_OPT RST PCH Handshake En must always be 0b on BXT
+	 * or else the reset will hang because there is no PCH to respond.
+	 * Move the handshake programming to initialization sequence.
+	 * Previously was left up to BIOS.
+	 */
+	val = I915_READ(HSW_NDE_RSTWRN_OPT);
+	val &= ~RESET_PCH_HANDSHAKE_ENABLE;
+	I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
+
+	/* Enable PG1 */
+	mutex_lock(&power_domains->lock);
+
+	well = lookup_power_well(dev_priv, SKL_DISP_PW_1);
+	intel_power_well_enable(dev_priv, well);
+
+	mutex_unlock(&power_domains->lock);
+
+	broxton_init_cdclk(dev_priv);
+	broxton_ddi_phy_init(dev_priv);
+
+	if (resume && dev_priv->csr.dmc_payload)
+		intel_csr_load_program(dev_priv);
+}
+
+void bxt_display_core_uninit(struct drm_i915_private *dev_priv)
+{
+	struct i915_power_domains *power_domains = &dev_priv->power_domains;
+	struct i915_power_well *well;
+
+	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+
+	broxton_ddi_phy_uninit(dev_priv);
+	broxton_uninit_cdclk(dev_priv);
+
+	/* The spec doesn't call for removing the reset handshake flag */
+
+	/* Disable PG1 */
+	mutex_lock(&power_domains->lock);
+
+	well = lookup_power_well(dev_priv, SKL_DISP_PW_1);
+	intel_power_well_disable(dev_priv, well);
+
+	mutex_unlock(&power_domains->lock);
+}
+
 static void chv_phy_control_init(struct drm_i915_private *dev_priv)
 {
 	struct i915_power_well *cmn_bc =
@@ -2312,6 +2355,8 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
 
 	if (IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) {
 		skl_display_core_init(dev_priv, resume);
+	} else if (IS_BROXTON(dev)) {
+		bxt_display_core_init(dev_priv, resume);
 	} else if (IS_CHERRYVIEW(dev)) {
 		mutex_lock(&power_domains->lock);
 		chv_phy_control_init(dev_priv);
@@ -2349,6 +2394,8 @@ 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);
+	else if (IS_BROXTON(dev_priv))
+		bxt_display_core_uninit(dev_priv);
 }
 
 /**