[PATCH 3/6] IPS driver: add GPU busy and turbo checking

[leann.ogasawara at canonical.com]

BugLink: http://bugs.launchpad.net/bugs/601057

Be sure to enable GPU turbo by default at load time and check GPU busy
and MCP exceeded status correctly.  Also fix up CPU power comparison and
work around buggy MCH temp reporting.

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
Signed-off-by: Matthew Garrett <mjg at redhat.com>
(cherry picked from commit 0385e5210c83b13fe685c54b6063655f80bce3ee)

Signed-off-by: Leann Ogasawara <leann.ogasawara at canonical.com>
---
 drivers/platform/x86/intel_ips.c |   30 +++++++++++++++++-------------
 1 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c
index f1dce3b..cdaf40e 100644
--- a/drivers/platform/x86/intel_ips.c
+++ b/drivers/platform/x86/intel_ips.c
@@ -515,7 +515,10 @@ static void ips_disable_cpu_turbo(struct ips_driver *ips)
  */
 static bool ips_gpu_busy(struct ips_driver *ips)
 {
-	return false;
+	if (!ips->gpu_turbo_enabled)
+		return false;
+
+	return ips->gpu_busy();
 }
 
 /**
@@ -627,7 +630,7 @@ static bool cpu_exceeded(struct ips_driver *ips, int cpu)
 	avg = cpu ? ips->ctv2_avg_temp : ips->ctv1_avg_temp;
 	if (avg > (ips->limits->core_temp_limit * 100))
 		ret = true;
-	if (ips->cpu_avg_power > ips->core_power_limit)
+	if (ips->cpu_avg_power > ips->core_power_limit * 100)
 		ret = true;
 	spin_unlock_irqrestore(&ips->turbo_status_lock, flags);
 
@@ -652,6 +655,8 @@ static bool mch_exceeded(struct ips_driver *ips)
 	spin_lock_irqsave(&ips->turbo_status_lock, flags);
 	if (ips->mch_avg_temp > (ips->limits->mch_temp_limit * 100))
 		ret = true;
+	if (ips->mch_avg_power > ips->mch_power_limit)
+		ret = true;
 	spin_unlock_irqrestore(&ips->turbo_status_lock, flags);
 
 	return ret;
@@ -747,7 +752,7 @@ static int ips_adjust(void *data)
 			ips_disable_gpu_turbo(ips);
 
 		/* We're outside our comfort zone, crank them down */
-		if (!mcp_exceeded(ips)) {
+		if (mcp_exceeded(ips)) {
 			ips_cpu_lower(ips);
 			ips_gpu_lower(ips);
 			goto sleep;
@@ -808,8 +813,7 @@ static u16 read_mgtv(struct ips_driver *ips)
 
 	ret = ((val * slope + 0x40) >> 7) + offset;
 
-
-	return ret;
+	return 0; /* MCH temp reporting buggy */
 }
 
 static u16 read_ptv(struct ips_driver *ips)
@@ -1471,14 +1475,6 @@ static int ips_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	if (trc & TRC_CORE2_EN)
 		ips->second_cpu = true;
 
-	if (!ips_get_i915_syms(ips)) {
-		dev_err(&dev->dev, "failed to get i915 symbols, graphics turbo disabled\n");
-		ips->gpu_turbo_enabled = false;
-	} else {
-		dev_dbg(&dev->dev, "graphics turbo enabled\n");
-		ips->gpu_turbo_enabled = true;
-	}
-
 	update_turbo_limits(ips);
 	dev_dbg(&dev->dev, "max cpu power clamp: %dW\n",
 		ips->mcp_power_limit / 10);
@@ -1488,6 +1484,14 @@ static int ips_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	if (thm_readl(THM_PSC) & PSP_PBRT)
 		ips->poll_turbo_status = true;
 
+	if (!ips_get_i915_syms(ips)) {
+		dev_err(&dev->dev, "failed to get i915 symbols, graphics turbo disabled\n");
+		ips->gpu_turbo_enabled = false;
+	} else {
+		dev_dbg(&dev->dev, "graphics turbo enabled\n");
+		ips->gpu_turbo_enabled = true;
+	}
+
 	/*
 	 * Check PLATFORM_INFO MSR to make sure this chip is
 	 * turbo capable.
-- 
1.7.0.4