drm/i915/bxt: Set time interval unit to 0.833us

Note that in Bspec you have to dig around in a section called
"Timestamp bases" and Bspec update request is filed.

Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com>
Signed-off-by: Akash Goel <akash.goel@intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
[danvet: Add note about state of Bspec.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 07588b6..6be853d 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2840,8 +2840,11 @@ enum skl_disp_power_wells {
 
 #define INTERVAL_1_28_US(us)   (((us) * 100) >> 7)
 #define INTERVAL_1_33_US(us)   (((us) * 3)   >> 2)
+#define INTERVAL_0_833_US(us)  (((us) * 6) / 5)
 #define GT_INTERVAL_FROM_US(dev_priv, us) (IS_GEN9(dev_priv) ? \
-                               INTERVAL_1_33_US(us) : \
+                               (IS_BROXTON(dev_priv) ? \
+                               INTERVAL_0_833_US(us) : \
+                               INTERVAL_1_33_US(us)) : \
                                INTERVAL_1_28_US(us))
 
 /*