2013/6/7 Damien Lespiau <damien.lespiau at intel.com>:
> 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 at intel.com>
> ---
> drivers/gpu/drm/i915/intel_pm.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 2eb1846..0465cd6 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3154,6 +3154,10 @@ 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;
Daniel recently complained about a similar check on one of my patches.
Looks like the preferred way would be "if (INTEL_INFO(dev)->gen <=
4)". I guess Daniel can do this change while applying the patch.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> +
> /* Respect the kernel parameter if it is set */
> if (i915_enable_rc6 >= 0)
> return i915_enable_rc6;
> --
> 1.8.1.4
>
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--
Paulo Zanoni
