[Intel-gfx] [PATCH 11/16] drm/i915: Do not initialize display core when display is disabled

[José Roberto de Souza]

With display disabled, driver don't need to enable any power well
or load the DMC firmware.

The only thing that *_display_core_init will do when display is
disabled is call intel_pch_reset_handshake(), so PCH handshake
will be unset and in counterpart *_display_core_uninit() will
only disable DC.

The power wells enabled by BIOS during boot will be disabled in
futher patch.

Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/intel_runtime_pm.c | 56 ++++++++++++++++---------
 1 file changed, 36 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 3b2588a377a9..8b1c4d0db0af 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -3285,6 +3285,9 @@ static void skl_display_core_init(struct drm_i915_private *dev_priv,
 	/* enable PCH reset handshake */
 	intel_pch_reset_handshake(dev_priv, !HAS_PCH_NOP(dev_priv));
 
+	if (!INTEL_INFO(dev_priv)->num_pipes)
+		return;
+
 	/* enable PG1 and Misc I/O */
 	mutex_lock(&power_domains->lock);
 
@@ -3296,8 +3299,7 @@ static void skl_display_core_init(struct drm_i915_private *dev_priv,
 
 	mutex_unlock(&power_domains->lock);
 
-	if (INTEL_INFO(dev_priv)->num_pipes)
-		skl_init_cdclk(dev_priv);
+	skl_init_cdclk(dev_priv);
 
 	gen9_dbuf_enable(dev_priv);
 
@@ -3312,10 +3314,12 @@ static void skl_display_core_uninit(struct drm_i915_private *dev_priv)
 
 	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
 
+	if (!INTEL_INFO(dev_priv)->num_pipes)
+		return;
+
 	gen9_dbuf_disable(dev_priv);
 
-	if (INTEL_INFO(dev_priv)->num_pipes)
-		skl_uninit_cdclk(dev_priv);
+	skl_uninit_cdclk(dev_priv);
 
 	/* The spec doesn't call for removing the reset handshake flag */
 	/* disable PG1 and Misc I/O */
@@ -3352,6 +3356,9 @@ void bxt_display_core_init(struct drm_i915_private *dev_priv,
 	 */
 	intel_pch_reset_handshake(dev_priv, false);
 
+	if (!INTEL_INFO(dev_priv)->num_pipes)
+		return;
+
 	/* Enable PG1 */
 	mutex_lock(&power_domains->lock);
 
@@ -3360,8 +3367,7 @@ void bxt_display_core_init(struct drm_i915_private *dev_priv,
 
 	mutex_unlock(&power_domains->lock);
 
-	if (INTEL_INFO(dev_priv)->num_pipes)
-		bxt_init_cdclk(dev_priv);
+	bxt_init_cdclk(dev_priv);
 
 	gen9_dbuf_enable(dev_priv);
 
@@ -3376,10 +3382,12 @@ void bxt_display_core_uninit(struct drm_i915_private *dev_priv)
 
 	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
 
+	if (!INTEL_INFO(dev_priv)->num_pipes)
+		return;
+
 	gen9_dbuf_disable(dev_priv);
 
-	if (INTEL_INFO(dev_priv)->num_pipes)
-		bxt_uninit_cdclk(dev_priv);
+	bxt_uninit_cdclk(dev_priv);
 
 	/* The spec doesn't call for removing the reset handshake flag */
 
@@ -3475,6 +3483,9 @@ static void cnl_display_core_init(struct drm_i915_private *dev_priv, bool resume
 	/* 1. Enable PCH Reset Handshake */
 	intel_pch_reset_handshake(dev_priv, !HAS_PCH_NOP(dev_priv));
 
+	if (!INTEL_INFO(dev_priv)->num_pipes)
+		return;
+
 	/* 2. Enable Comp */
 	val = I915_READ(CHICKEN_MISC_2);
 	val &= ~CNL_COMP_PWR_DOWN;
@@ -3502,8 +3513,7 @@ static void cnl_display_core_init(struct drm_i915_private *dev_priv, bool resume
 	mutex_unlock(&power_domains->lock);
 
 	/* 5. Enable CD clock */
-	if (INTEL_INFO(dev_priv)->num_pipes)
-		cnl_init_cdclk(dev_priv);
+	cnl_init_cdclk(dev_priv);
 
 	/* 6. Enable DBUF */
 	gen9_dbuf_enable(dev_priv);
@@ -3520,14 +3530,16 @@ static void cnl_display_core_uninit(struct drm_i915_private *dev_priv)
 
 	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
 
-	/* 1. Disable all display engine functions -> aready done */
+	if (!INTEL_INFO(dev_priv)->num_pipes)
+		return;
+
+	/* 1. Disable all display engine functions -> already done */
 
 	/* 2. Disable DBUF */
 	gen9_dbuf_disable(dev_priv);
 
 	/* 3. Disable CD clock */
-	if (INTEL_INFO(dev_priv)->num_pipes)
-		cnl_uninit_cdclk(dev_priv);
+	cnl_uninit_cdclk(dev_priv);
 
 	/*
 	 * 4. Disable Power Well 1 (PG1).
@@ -3560,6 +3572,9 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
 	/* 1. Enable PCH reset handshake. */
 	intel_pch_reset_handshake(dev_priv, !HAS_PCH_NOP(dev_priv));
 
+	if (!INTEL_INFO(dev_priv)->num_pipes)
+		return;
+
 	for (port = PORT_A; port <= PORT_B; port++) {
 		/* 2. Enable DDI combo PHY comp. */
 		val = I915_READ(ICL_PHY_MISC(port));
@@ -3588,8 +3603,7 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
 	mutex_unlock(&power_domains->lock);
 
 	/* 5. Enable CDCLK. */
-	if (INTEL_INFO(dev_priv)->num_pipes)
-		icl_init_cdclk(dev_priv);
+	icl_init_cdclk(dev_priv);
 
 	/* 6. Enable DBUF. */
 	icl_dbuf_enable(dev_priv);
@@ -3610,14 +3624,16 @@ static void icl_display_core_uninit(struct drm_i915_private *dev_priv)
 
 	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
 
-	/* 1. Disable all display engine functions -> aready done */
+	if (!INTEL_INFO(dev_priv)->num_pipes)
+		return;
+
+	/* 1. Disable all display engine functions -> already done */
 
 	/* 2. Disable DBUF */
 	icl_dbuf_disable(dev_priv);
 
 	/* 3. Disable CD clock */
-	if (INTEL_INFO(dev_priv)->num_pipes)
-		icl_uninit_cdclk(dev_priv);
+	icl_uninit_cdclk(dev_priv);
 
 	/*
 	 * 4. Disable Power Well 1 (PG1).
@@ -3784,11 +3800,11 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
 		skl_display_core_init(dev_priv, resume);
 	} else if (IS_GEN9_LP(dev_priv)) {
 		bxt_display_core_init(dev_priv, resume);
-	} else if (IS_CHERRYVIEW(dev_priv)) {
+	} else if (IS_CHERRYVIEW(dev_priv) && INTEL_INFO(dev_priv)->num_pipes) {
 		mutex_lock(&power_domains->lock);
 		chv_phy_control_init(dev_priv);
 		mutex_unlock(&power_domains->lock);
-	} else if (IS_VALLEYVIEW(dev_priv)) {
+	} else if (IS_VALLEYVIEW(dev_priv) && INTEL_INFO(dev_priv)->num_pipes) {
 		mutex_lock(&power_domains->lock);
 		vlv_cmnlane_wa(dev_priv);
 		mutex_unlock(&power_domains->lock);
-- 
2.19.1