patches.baytrail/0722-drm-i915-add-i915.pc8_timeout-function.patch

From 7b750380f5da4eb0cc683840208a8d22a035c549 Mon Sep 17 00:00:00 2001
From: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Mon, 19 Aug 2013 13:18:11 -0300
Subject: drm/i915: add i915.pc8_timeout function

We currently only enter PC8+ after all its required conditions are
met, there's no rendering, and we stay like that for at least 5
seconds.

I chose "5 seconds" because this value is conservative and won't make
us enter/leave PC8+ thousands of times after the screen is off: some
desktop environments have applications that wake up and do rendering
every 1-3 seconds, even when the screen is off and the machine is
completely idle.

But when I was testing my PC8+ patches I set the default value to
100ms so I could use the bad-behaving desktop environments to
stress-test my patches. I also thought it would be a good idea to ask
our power management team to test different values, but I'm pretty
sure they would ask me for an easy way to change the timeout. So to
help these 2 cases I decided to create an option that would make it
easier to change the default value. I also expect people making
specific products that use our driver could try to find the perfect
timeout for them.

Anyway, fixing the bad-behaving applications will always lead to
better power savings than just changing the timeout value: you need to
stop waking the Kernel, not quickly put it back to sleep again after
you wake it for nothing. Bad sleep leads to bad mood!

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry picked from commit 900587453219f6090a1e28db1bb790aa64820131)
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c      | 4 ++++
 drivers/gpu/drm/i915/i915_drv.h      | 1 +
 drivers/gpu/drm/i915/intel_display.c | 2 +-
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index f19736208214..ad28a72cf373 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -145,6 +145,10 @@ int i915_enable_pc8 __read_mostly = 0;
 module_param_named(enable_pc8, i915_enable_pc8, int, 0600);
 MODULE_PARM_DESC(enable_pc8, "Enable support for low power package C states (PC8+) (default: false)");
 
+int i915_pc8_timeout __read_mostly = 5000;
+module_param_named(pc8_timeout, i915_pc8_timeout, int, 0600);
+MODULE_PARM_DESC(pc8_timeout, "Number of msecs of idleness required to enter PC8+ (default: 5000)");
+
 bool i915_prefault_disable __read_mostly;
 module_param_named(prefault_disable, i915_prefault_disable, bool, 0600);
 MODULE_PARM_DESC(prefault_disable,
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 85a352860a83..8ee15b471854 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1707,6 +1707,7 @@ extern int i915_disable_power_well __read_mostly;
 extern int i915_enable_ips __read_mostly;
 extern bool i915_fastboot __read_mostly;
 extern int i915_enable_pc8 __read_mostly;
+extern int i915_pc8_timeout __read_mostly;
 extern bool i915_prefault_disable __read_mostly;
 
 extern int i915_suspend(struct drm_device *dev, pm_message_t state);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6cf35357afad..7453d6f82631 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6101,7 +6101,7 @@ static void __hsw_enable_package_c8(struct drm_i915_private *dev_priv)
 		return;
 
 	schedule_delayed_work(&dev_priv->pc8.enable_work,
-			      msecs_to_jiffies(5 * 1000));
+			      msecs_to_jiffies(i915_pc8_timeout));
 }
 
 static void __hsw_disable_package_c8(struct drm_i915_private *dev_priv)
-- 
1.8.5.rc3