[PATCH 04/10] drm/i915: add RPS configuration for Haswell

[Eugeni Dodonov <eugeni.dodonov@intel.com>]

Most of the RPS and RC6 enabling functionality is similar to what we had
on Gen6/Gen7, so we preserve most of the registers.

Note that Haswell only has RC6, so account for that as well. As suggested
by Daniel Vetter, to reduce the amount of changes in the patch, we still
write the RC6p/RC6pp thresholds, but those are ignored on Haswell.

Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h |  1 +
 drivers/gpu/drm/i915/intel_pm.c | 37 +++++++++++++++++++++++++------------
 2 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f17de3d..9d5bf06 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4156,6 +4156,7 @@
 #define   GEN6_RP_UP_IDLE_MIN			(0x1<<3)
 #define   GEN6_RP_UP_BUSY_AVG			(0x2<<3)
 #define   GEN6_RP_UP_BUSY_CONT			(0x4<<3)
+#define   GEN7_RP_DOWN_IDLE_AVG			(0x2<<0)
 #define   GEN6_RP_DOWN_IDLE_CONT		(0x1<<0)
 #define GEN6_RP_UP_THRESHOLD			0xA02C
 #define GEN6_RP_DOWN_THRESHOLD			0xA030
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 29720d2..a3ee1b1 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2402,20 +2402,24 @@ static void gen6_enable_rps(struct drm_device *dev)
 	I915_WRITE(GEN6_RC6p_THRESHOLD, 100000);
 	I915_WRITE(GEN6_RC6pp_THRESHOLD, 64000); /* unused */
 
+	/* Check if we are enabling RC6 */
 	rc6_mode = intel_enable_rc6(dev_priv->dev);
 	if (rc6_mode & INTEL_RC6_ENABLE)
 		rc6_mask |= GEN6_RC_CTL_RC6_ENABLE;
 
-	if (rc6_mode & INTEL_RC6p_ENABLE)
-		rc6_mask |= GEN6_RC_CTL_RC6p_ENABLE;
+	/* We don't use those on Haswell */
+	if (!IS_HASWELL(dev)) {
+		if (rc6_mode & INTEL_RC6p_ENABLE)
+			rc6_mask |= GEN6_RC_CTL_RC6p_ENABLE;
 
-	if (rc6_mode & INTEL_RC6pp_ENABLE)
-		rc6_mask |= GEN6_RC_CTL_RC6pp_ENABLE;
+		if (rc6_mode & INTEL_RC6pp_ENABLE)
+			rc6_mask |= GEN6_RC_CTL_RC6pp_ENABLE;
+	}
 
 	DRM_INFO("Enabling RC6 states: RC6 %s, RC6p %s, RC6pp %s\n",
-			(rc6_mode & INTEL_RC6_ENABLE) ? "on" : "off",
-			(rc6_mode & INTEL_RC6p_ENABLE) ? "on" : "off",
-			(rc6_mode & INTEL_RC6pp_ENABLE) ? "on" : "off");
+			(rc6_mask & GEN6_RC_CTL_RC6_ENABLE) ? "on" : "off",
+			(rc6_mask & GEN6_RC_CTL_RC6p_ENABLE) ? "on" : "off",
+			(rc6_mask & GEN6_RC_CTL_RC6pp_ENABLE) ? "on" : "off");
 
 	I915_WRITE(GEN6_RC_CONTROL,
 		   rc6_mask |
@@ -2433,10 +2437,19 @@ static void gen6_enable_rps(struct drm_device *dev)
 	I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
 		   dev_priv->max_delay << 24 |
 		   dev_priv->min_delay << 16);
-	I915_WRITE(GEN6_RP_UP_THRESHOLD, 10000);
-	I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 1000000);
-	I915_WRITE(GEN6_RP_UP_EI, 100000);
-	I915_WRITE(GEN6_RP_DOWN_EI, 5000000);
+
+	if (IS_HASWELL(dev)) {
+		I915_WRITE(GEN6_RP_UP_THRESHOLD, 59400);
+		I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 245000);
+		I915_WRITE(GEN6_RP_UP_EI, 66000);
+		I915_WRITE(GEN6_RP_DOWN_EI, 350000);
+	} else {
+		I915_WRITE(GEN6_RP_UP_THRESHOLD, 10000);
+		I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 1000000);
+		I915_WRITE(GEN6_RP_UP_EI, 100000);
+		I915_WRITE(GEN6_RP_DOWN_EI, 5000000);
+	}
+
 	I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
 	I915_WRITE(GEN6_RP_CONTROL,
 		   GEN6_RP_MEDIA_TURBO |
@@ -2444,7 +2457,7 @@ static void gen6_enable_rps(struct drm_device *dev)
 		   GEN6_RP_MEDIA_IS_GFX |
 		   GEN6_RP_ENABLE |
 		   GEN6_RP_UP_BUSY_AVG |
-		   GEN6_RP_DOWN_IDLE_CONT);
+		   (IS_HASWELL(dev)) ? GEN7_RP_DOWN_IDLE_AVG : GEN6_RP_DOWN_IDLE_CONT);
 
 	if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
 		     500))
-- 
1.7.11.1