drm/i915: Power Context register is only available for gen4 mobiles

The ability to save the hardware context upon powering down the render
clock through PWRCTXA is only available on a couple of gen4 chipsets.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a95c693..aba1c33 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5973,7 +5973,7 @@ void intel_init_clock_gating(struct drm_device *dev)
                                       "Disable RC6\n");
        }
 
-       if (I915_HAS_RC6(dev) && drm_core_check_feature(dev, DRIVER_MODESET)) {
+       if (IS_GEN4(dev) && IS_MOBILE(dev)) {
                if (dev_priv->pwrctx == NULL)
                        dev_priv->pwrctx = intel_alloc_context_page(dev);
                if (dev_priv->pwrctx) {