[PATCH v5 05/23] drm/i915/slpc: Sanitize GuC version

[Sagar Arun Kamble]

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

The SLPC interface is dependent on GuC version.
 Only GuC versions known to be compatible are supported here.

On SKL, BXT, KBL, GuC firmware v9 is supported.  Other
platforms and versions can be added here later.

v1: Updated with modified sanitize_slpc_option in earlier patch.

v2-v3: Rebase.

v4: Updated support for GuC firmware v9.

v5: Commit subject updated.

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 88b9488..317bf7f 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -163,6 +163,8 @@ static void guc_interrupts_capture(struct drm_i915_private *dev_priv)
 
 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);
@@ -178,6 +180,9 @@ 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 != 9))
+		i915.enable_slpc = 0;
 }
 
 static u32 get_gttype(struct drm_i915_private *dev_priv)
-- 
1.9.1