[Intel-gfx] [PATCH] drm/i915: Protect older gen against intel_gt_init_powersave()

[Chris Wilson]

In the middle of intel_gt_init_powersave() we have an if-chain that ends
with a universal else clause to read gen6+ registers. Older platforms
like Pineview that end up here do not like those registers and may even
OOPS whilst reading them!

Fixes: 3a45b05c4517 ("drm/i915: Preserve current RPS frequency across init")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1ac32428d4db..86e136c23ac2 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6493,7 +6493,7 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 		cherryview_init_gt_powersave(dev_priv);
 	else if (IS_VALLEYVIEW(dev_priv))
 		valleyview_init_gt_powersave(dev_priv);
-	else
+	else if (INTEL_GEN(dev_priv) >= 6)
 		gen6_init_rps_frequencies(dev_priv);
 
 	/* Derive initial user preferences/limits from the hardware limits */
-- 
2.8.1