drm/i915/chv: calculate rc6 residency correctly
The register to read cz count is different from vlv. Also
the counts returned from CCK_CTL1 for BSW are (ticks in 30ns - 1).
czcount_30ns of value 1 is a special case for 320Mhz.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80703
Suggested-by: Deepak S <deepak.s@linux.intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Tested-by: Guo Jinxian <jinxianx.guo@intel.com>
Reviewed-by: Deepak S <deepak.s@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index b15c8ce..ae7fd8f 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -47,22 +47,45 @@
intel_runtime_pm_get(dev_priv);
- /* On VLV, residency time is in CZ units rather than 1.28us */
+ /* On VLV and CHV, residency time is in CZ units rather than 1.28us */
if (IS_VALLEYVIEW(dev)) {
- u32 clkctl2;
+ u32 reg, czcount_30ns;
- clkctl2 = I915_READ(VLV_CLK_CTL2) >>
- CLK_CTL2_CZCOUNT_30NS_SHIFT;
- if (!clkctl2) {
- WARN(!clkctl2, "bogus CZ count value");
+ if (IS_CHERRYVIEW(dev))
+ reg = CHV_CLK_CTL1;
+ else
+ reg = VLV_CLK_CTL2;
+
+ czcount_30ns = I915_READ(reg) >> CLK_CTL2_CZCOUNT_30NS_SHIFT;
+
+ if (!czcount_30ns) {
+ WARN(!czcount_30ns, "bogus CZ count value");
ret = 0;
goto out;
}
- units = DIV_ROUND_UP_ULL(30ULL * bias, (u64)clkctl2);
+
+ units = 0;
+ div = 1000000ULL;
+
+ if (IS_CHERRYVIEW(dev)) {
+ /* Special case for 320Mhz */
+ if (czcount_30ns == 1) {
+ div = 10000000ULL;
+ units = 3125ULL;
+ } else {
+ /* chv counts are one less */
+ czcount_30ns += 1;
+ }
+ }
+
+ if (units == 0)
+ units = DIV_ROUND_UP_ULL(30ULL * bias,
+ (u64)czcount_30ns);
+
if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH)
units <<= 8;
- div = 1000000ULL * bias;
+ div = div * bias;
}
raw_time = I915_READ(reg) * units;