[Intel-gfx] [PATCH 1/2] drm/i915/skl: Remove of the DC5 code

[Damien Lespiau]

This code is all dead code since we want to go up to DC6, always.

Cc: A.Sunil Kamath <sunil.kamath at intel.com>
Cc: Suketu Shah <suketu.j.shah at intel.com>
Cc Animesh Manna <animesh.manna at intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>

Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
---
 drivers/gpu/drm/i915/intel_runtime_pm.c | 99 +++++----------------------------
 1 file changed, 13 insertions(+), 86 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index a472012..ae80ffa 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -49,7 +49,6 @@
  * present for a given platform.
  */
 
-#define GEN9_ENABLE_DC5(dev) 0
 #define SKL_ENABLE_DC6(dev) IS_SKYLAKE(dev)
 
 #define for_each_power_well(i, power_well, domain_mask, power_domains)	\
@@ -455,71 +454,6 @@ static void gen9_set_dc_state_debugmask_memory_up(
 	}
 }
 
-static void assert_can_enable_dc5(struct drm_i915_private *dev_priv)
-{
-	struct drm_device *dev = dev_priv->dev;
-	bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
-					SKL_DISP_PW_2);
-
-	WARN(!IS_SKYLAKE(dev), "Platform doesn't support DC5.\n");
-	WARN(!HAS_RUNTIME_PM(dev), "Runtime PM not enabled.\n");
-	WARN(pg2_enabled, "PG2 not disabled to enable DC5.\n");
-
-	WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5),
-				"DC5 already programmed to be enabled.\n");
-	WARN(dev_priv->pm.suspended,
-		"DC5 cannot be enabled, if platform is runtime-suspended.\n");
-
-	assert_csr_loaded(dev_priv);
-}
-
-static void assert_can_disable_dc5(struct drm_i915_private *dev_priv)
-{
-	bool pg2_enabled = intel_display_power_well_is_enabled(dev_priv,
-					SKL_DISP_PW_2);
-	/*
-	 * During initialization, the firmware may not be loaded yet.
-	 * We still want to make sure that the DC enabling flag is cleared.
-	 */
-	if (dev_priv->power_domains.initializing)
-		return;
-
-	WARN(!pg2_enabled, "PG2 not enabled to disable DC5.\n");
-	WARN(dev_priv->pm.suspended,
-		"Disabling of DC5 while platform is runtime-suspended should never happen.\n");
-}
-
-static void gen9_enable_dc5(struct drm_i915_private *dev_priv)
-{
-	uint32_t val;
-
-	assert_can_enable_dc5(dev_priv);
-
-	DRM_DEBUG_KMS("Enabling DC5\n");
-
-	gen9_set_dc_state_debugmask_memory_up(dev_priv);
-
-	val = I915_READ(DC_STATE_EN);
-	val &= ~DC_STATE_EN_UPTO_DC5_DC6_MASK;
-	val |= DC_STATE_EN_UPTO_DC5;
-	I915_WRITE(DC_STATE_EN, val);
-	POSTING_READ(DC_STATE_EN);
-}
-
-static void gen9_disable_dc5(struct drm_i915_private *dev_priv)
-{
-	uint32_t val;
-
-	assert_can_disable_dc5(dev_priv);
-
-	DRM_DEBUG_KMS("Disabling DC5\n");
-
-	val = I915_READ(DC_STATE_EN);
-	val &= ~DC_STATE_EN_UPTO_DC5;
-	I915_WRITE(DC_STATE_EN, val);
-	POSTING_READ(DC_STATE_EN);
-}
-
 static void assert_can_enable_dc6(struct drm_i915_private *dev_priv)
 {
 	struct drm_device *dev = dev_priv->dev;
@@ -626,20 +560,16 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
 				!I915_READ(HSW_PWR_WELL_BIOS),
 				"Invalid for power well status to be enabled, unless done by the BIOS, \
 				when request is to disable!\n");
-			if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
-				power_well->data == SKL_DISP_PW_2) {
-				if (SKL_ENABLE_DC6(dev)) {
-					skl_disable_dc6(dev_priv);
-					/*
-					 * DDI buffer programming unnecessary during driver-load/resume
-					 * as it's already done during modeset initialization then.
-					 * It's also invalid here as encoder list is still uninitialized.
-					 */
-					if (!dev_priv->power_domains.initializing)
-						intel_prepare_ddi(dev);
-				} else {
-					gen9_disable_dc5(dev_priv);
-				}
+			if (SKL_ENABLE_DC6(dev) &&
+			    power_well->data == SKL_DISP_PW_2) {
+				skl_disable_dc6(dev_priv);
+				/*
+				 * DDI buffer programming unnecessary during driver-load/resume
+				 * as it's already done during modeset initialization then.
+				 * It's also invalid here as encoder list is still uninitialized.
+				 */
+				if (!dev_priv->power_domains.initializing)
+					intel_prepare_ddi(dev);
 			}
 			I915_WRITE(HSW_PWR_WELL_DRIVER, tmp | req_mask);
 		}
@@ -658,8 +588,8 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
 			POSTING_READ(HSW_PWR_WELL_DRIVER);
 			DRM_DEBUG_KMS("Disabling %s\n", power_well->name);
 
-			if ((GEN9_ENABLE_DC5(dev) || SKL_ENABLE_DC6(dev)) &&
-				power_well->data == SKL_DISP_PW_2) {
+			if (SKL_ENABLE_DC6(dev) &&
+			    power_well->data == SKL_DISP_PW_2) {
 				enum csr_state state;
 				/* TODO: wait for a completion event or
 				 * similar here instead of busy
@@ -671,10 +601,7 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
 					DRM_ERROR("CSR firmware not ready (%d)\n",
 							state);
 				else
-					if (SKL_ENABLE_DC6(dev))
-						skl_enable_dc6(dev_priv);
-					else
-						gen9_enable_dc5(dev_priv);
+					skl_enable_dc6(dev_priv);
 			}
 		}
 	}
-- 
2.1.0