[RFC 1/3] drm: Make drm_vblank_offdelay per-device

[mjg at redhat.com (Matthew Garrett)]

drm_vblank_offdelay is currently a system global, despite the optimal
value being hardware-specific. Move it to the drm_device structure.

Signed-off-by: Matthew Garrett <mjg at redhat.com>
---
 drivers/gpu/drm/drm_irq.c  |    6 +++---
 drivers/gpu/drm/drm_stub.c |    8 +++++---
 include/drm/drmP.h         |    2 +-
 3 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index cb3794a..8bcb6a4 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -928,7 +928,7 @@ EXPORT_SYMBOL(drm_vblank_get);
  * @crtc: which counter to give up
  *
  * Release ownership of a given vblank counter, turning off interrupts
- * if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
+ * if possible. Disable interrupts after vblank_offdelay milliseconds.
  */
 void drm_vblank_put(struct drm_device *dev, int crtc)
 {
@@ -936,9 +936,9 @@ void drm_vblank_put(struct drm_device *dev, int crtc)
 
 	/* Last user schedules interrupt disable */
 	if (atomic_dec_and_test(&dev->vblank_refcount[crtc]) &&
-	    (drm_vblank_offdelay > 0))
+	    (dev->vblank_offdelay > 0))
 		mod_timer(&dev->vblank_disable_timer,
-			  jiffies + ((drm_vblank_offdelay * DRM_HZ)/1000));
+			  jiffies + ((dev->vblank_offdelay * DRM_HZ)/1000));
 }
 EXPORT_SYMBOL(drm_vblank_put);
 
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 6d7b083..189a077 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -40,8 +40,8 @@
 unsigned int drm_debug = 0;	/* 1 to enable debug output */
 EXPORT_SYMBOL(drm_debug);
 
-unsigned int drm_vblank_offdelay = 5000;    /* Default to 5000 msecs. */
-EXPORT_SYMBOL(drm_vblank_offdelay);
+unsigned int drm_default_vblank_offdelay = 5000;   /* Default to 5000 msecs. */
+EXPORT_SYMBOL(drm_default_vblank_offdelay);
 
 unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
 EXPORT_SYMBOL(drm_timestamp_precision);
@@ -54,7 +54,7 @@ MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
 MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
 
 module_param_named(debug, drm_debug, int, 0600);
-module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
+module_param_named(vblankoffdelay, drm_default_vblank_offdelay, int, 0600);
 module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
 
 struct idr drm_minors_idr;
@@ -290,6 +290,8 @@ int drm_fill_in_dev(struct drm_device *dev,
 
 	dev->driver = driver;
 
+	dev->vblank_offdelay = drm_default_vblank_offdelay;
+
 	if (dev->driver->bus->agp_init) {
 		retcode = dev->driver->bus->agp_init(dev);
 		if (retcode)
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index cf39949..81e6bbb 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1168,6 +1168,7 @@ struct drm_device {
 	struct idr object_name_idr;
 	/*@} */
 	int switch_power_state;
+	int vblank_offdelay;
 };
 
 #define DRM_SWITCH_POWER_ON 0
@@ -1463,7 +1464,6 @@ extern void drm_put_dev(struct drm_device *dev);
 extern int drm_put_minor(struct drm_minor **minor);
 extern unsigned int drm_debug;
 
-extern unsigned int drm_vblank_offdelay;
 extern unsigned int drm_timestamp_precision;
 
 extern struct class *drm_class;
-- 
1.7.7.1