drm/i915/kbl: KBL also needs to run the SAGV code

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: stable@vger.kernel.org
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1474578035-424-4-git-send-email-paulo.r.zanoni@intel.com
(cherry picked from commit 6e3100ec21e7c774a0fc01e36a1e0739530c2f71)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1058729..93ae274 100644 (file)
--- 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;