[PATCH 06/24] drm/i915/slpc: Sanitize SLPC version

[Sagar Arun Kamble]

From: Tom O'Rourke <Tom.O'Rourke at intel.com>

The SLPC interface has changed and could continue to
change.  Only GuC versions known to be compatible are
supported here.

On Skylake, GuC firmware v6 is supported.  Other
platforms and versions can be added here later.

v1: Updated with modified sanitize_slpc_option in earlier patch.

Reviewed-by: David Weinehall <david.weinehall at linux.intel.com>
Signed-off-by: Tom O'Rourke <Tom.O'Rourke at intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
---
 drivers/gpu/drm/i915/intel_guc_loader.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 2dfdb24..023064d 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -146,6 +146,8 @@ static void direct_interrupts_to_guc(struct drm_i915_private *dev_priv)
 
 static void sanitize_slpc_option(struct drm_i915_private *dev_priv)
 {
+	struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
+
 	/* Handle default case */
 	if (i915.enable_slpc < 0)
 		i915.enable_slpc = HAS_SLPC(dev_priv);
@@ -161,6 +163,9 @@ static void sanitize_slpc_option(struct drm_i915_private *dev_priv)
 	/* slpc requires guc submission */
 	if (!i915.enable_guc_submission)
 		i915.enable_slpc = 0;
+
+	if (IS_SKYLAKE(dev_priv) && (guc_fw->guc_fw_major_found != 6))
+		i915.enable_slpc = 0;
 }
 
 static u32 get_gttype(struct drm_i915_private *dev_priv)
-- 
1.9.1