drm/i915: vlv: fix RPS interrupt mask setting

This typo may lead to missed RPS interrupts and as a result a too
low or too high frequency for the current workload. The interrupt mask
will be set properly at a subsequent GPU idle event, but can get
corrupted again at the next RPS up/down event.

Signed-off-by: Imre Deak <[e-mail]>
Reviewed-by: Chris Wilson <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/i915/intel_pm.c

···
 	if (val != dev_priv->rps.cur_freq)
 		vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, val);
 
-	I915_WRITE(GEN6_PMINTRMSK, val);
+	I915_WRITE(GEN6_PMINTRMSK, gen6_rps_pm_mask(dev_priv, val));
 
 	dev_priv->rps.cur_freq = val;
 	trace_intel_gpu_freq_change(vlv_gpu_freq(dev_priv, val));