drm/i915/selftests: Skip RPS tests on Ironlake (only IPS)

Since Ironlake uses intel_ips.ko for its dynamic frequency adjustment,
we do not have direct control over the frequency management so such
tests are defunct. Similarly, we can't check the gen6+ RPS registers on
Ironlake.

Hopefully this catches all the invalid tests now that Ironlake has
rejoined the dynamic GPU frequency club. There is an opportunity for the
reader to add tests to exercise MEMINTRSTS and co.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201022210814.23004-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/selftest_rps.c

@@ -219,7 +219,7 @@ int live_rps_clock_interval(void *arg)
 	struct igt_spinner spin;
 	int err = 0;
 
-	if (!intel_rps_is_enabled(rps))
+	if (!intel_rps_is_enabled(rps) || INTEL_GEN(gt->i915) < 6)
 		return 0;
 
 	if (igt_spinner_init(&spin, gt))
@@ -1028,7 +1028,7 @@ int live_rps_interrupt(void *arg)
 	 * First, let's check whether or not we are receiving interrupts.
 	 */
 
-	if (!intel_rps_has_interrupts(rps))
+	if (!intel_rps_has_interrupts(rps) || INTEL_GEN(gt->i915) < 6)
 		return 0;
 
 	intel_gt_pm_get(gt);
@@ -1133,7 +1133,7 @@ int live_rps_power(void *arg)
 	 * that theory.
 	 */
 
-	if (!intel_rps_is_enabled(rps))
+	if (!intel_rps_is_enabled(rps) || INTEL_GEN(gt->i915) < 6)
 		return 0;
 
 	if (!librapl_energy_uJ())
@@ -1237,7 +1237,7 @@ int live_rps_dynamic(void *arg)
 	 * moving parts into dynamic reclocking based on load.
 	 */
 
-	if (!intel_rps_is_enabled(rps))
+	if (!intel_rps_is_enabled(rps) || INTEL_GEN(gt->i915) < 6)
 		return 0;
 
 	if (igt_spinner_init(&spin, gt))