drm/i915: Macros to convert PM time interval values to microseconds

Added a new GT_PM_INTERVAL_TO_US macro to perform the platform
specific conversion of PM time interval values to microseconds unit.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Akash Goel <akash.goel@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1461350146-23454-1-git-send-email-akash.goel@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 08f01f4..58ac6c7 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2964,6 +2964,15 @@ enum skl_disp_power_wells {
                                INTERVAL_1_33_US(us)) : \
                                INTERVAL_1_28_US(us))
 
+#define INTERVAL_1_28_TO_US(interval)  (((interval) << 7) / 100)
+#define INTERVAL_1_33_TO_US(interval)  (((interval) << 2) / 3)
+#define INTERVAL_0_833_TO_US(interval) (((interval) * 5)  / 6)
+#define GT_PM_INTERVAL_TO_US(dev_priv, interval) (IS_GEN9(dev_priv) ? \
+                           (IS_BROXTON(dev_priv) ? \
+                           INTERVAL_0_833_TO_US(interval) : \
+                           INTERVAL_1_33_TO_US(interval)) : \
+                           INTERVAL_1_28_TO_US(interval))
+
 /*
  * Logical Context regs
  */