drm/i915/vlv: disable rc6p and rc6pp residency reporting on BYT

Byt doesn't have rc6p and rc6pp support and even more important the
the offsets of the residency registers there's something else. So Just
return a constant 0 to avoid upsetting userspace tools like powertop.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Explain a bit in the commit message what's going on.]
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 7b4c79cdb39e8f5ba6c98e01df327050904de782..176de441002c43a3822e241073c5c7072fb660d4 100644 (file)
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -65,6 +65,8 @@ show_rc6p_ms(struct device *kdev, struct device_attribute *attr, char *buf)
 {
        struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
        u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
+       if (IS_VALLEYVIEW(dminor->dev))
+               rc6p_residency = 0;
        return snprintf(buf, PAGE_SIZE, "%u\n", rc6p_residency);
 }
 
@@ -73,6 +75,8 @@ show_rc6pp_ms(struct device *kdev, struct device_attribute *attr, char *buf)
 {
        struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
        u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
+       if (IS_VALLEYVIEW(dminor->dev))
+               rc6pp_residency = 0;
        return snprintf(buf, PAGE_SIZE, "%u\n", rc6pp_residency);
 }