According to BSpec, it's the "core CPUs" that need the code, which
means SKL and KBL, but not BXT.

I don't have a KBL to test this patch on it.

v2: Only SKL should have I915_SAGV_NOT_CONTROLLED.

Cc: sta...@vger.kernel.org
Reviewed-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 13809a3..f09d912 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2880,8 +2880,14 @@ skl_wm_plane_id(const struct intel_plane *plane)
 static bool
 intel_has_sagv(struct drm_i915_private *dev_priv)
 {
-       return IS_SKYLAKE(dev_priv) &&
-              dev_priv->sagv_status != I915_SAGV_NOT_CONTROLLED;
+       if (IS_KABYLAKE(dev_priv))
+               return true;
+
+       if (IS_SKYLAKE(dev_priv) &&
+           dev_priv->sagv_status != I915_SAGV_NOT_CONTROLLED)
+               return true;
+
+       return false;
 }
 
 /*
@@ -2919,7 +2925,7 @@ intel_enable_sagv(struct drm_i915_private *dev_priv)
         * Some skl systems, pre-release machines in particular,
         * don't actually have an SAGV.
         */
-       if (ret == -ENXIO) {
+       if (IS_SKYLAKE(dev_priv) && ret == -ENXIO) {
                DRM_DEBUG_DRIVER("No SAGV found on system, ignoring\n");
                dev_priv->sagv_status = I915_SAGV_NOT_CONTROLLED;
                return 0;
@@ -2973,7 +2979,7 @@ intel_disable_sagv(struct drm_i915_private *dev_priv)
         * Some skl systems, pre-release machines in particular,
         * don't actually have an SAGV.
         */
-       if (result == -ENXIO) {
+       if (IS_SKYLAKE(dev_priv) && result == -ENXIO) {
                DRM_DEBUG_DRIVER("No SAGV found on system, ignoring\n");
                dev_priv->sagv_status = I915_SAGV_NOT_CONTROLLED;
                return 0;
-- 
2.7.4

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