drm/i915: Don't try to calculate RC6 residency on GEN4 and before

intel_enable_rc6() is used to check if we can compute the RC6 residency
in the sysfs code. Disable this for platforms older than Ironlake.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9b95f78..e81d376 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3167,6 +3167,10 @@ static void valleyview_disable_rps(struct drm_device *dev)
 
 int intel_enable_rc6(const struct drm_device *dev)
 {
+       /* No RC6 before Ironlake */
+       if (INTEL_INFO(dev)->gen < 5)
+               return 0;
+
        /* Respect the kernel parameter if it is set */
        if (i915_enable_rc6 >= 0)
                return i915_enable_rc6;