drm/i915: Don't update the render-clock for every bo.
Only update the render-clock on transition from busy to idle and vice
versa, or else we burn a significant percentage of the cpu just rewriting
the register -- not quite as power-friendly as intended ;-)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a0f2941..267adc6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4052,8 +4052,13 @@
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return;
- dev_priv->busy = true;
- intel_increase_renderclock(dev, true);
+ if (!dev_priv->busy) {
+ dev_priv->busy = true;
+ intel_increase_renderclock(dev, true);
+ } else {
+ mod_timer(&dev_priv->idle_timer, jiffies +
+ msecs_to_jiffies(GPU_IDLE_TIMEOUT));
+ }
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
if (!crtc->fb)