[PATCH 05/24] drm/i915/slpc: Sanitize GuC version

[Sagar Arun Kamble]

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

SLPC with GuC firmware v9 is supported with this series.
Other platforms and corresponding checks added later in the series.

v1: Updated with modified sanitize_slpc_option in earlier patch.

v2-v3: Rebase.

v4: Updated support for GuC firmware v9.

v5: Commit subject updated.

v6: Commit subject and message update.

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 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 95bd578..83d2fc5 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -157,6 +157,8 @@ static void guc_interrupts_capture(struct drm_i915_private *dev_priv)
 
 void sanitize_slpc_option(struct drm_i915_private *dev_priv)
 {
+	struct intel_uc_fw *guc_fw = &dev_priv->guc.fw;
+
 	/* slpc requires hardware support and compatible firmware */
 	if (!HAS_SLPC(dev_priv))
 		i915.enable_slpc = 0;
@@ -168,6 +170,11 @@ void sanitize_slpc_option(struct drm_i915_private *dev_priv)
 	/* slpc requires guc submission */
 	if (!i915.enable_guc_submission)
 		i915.enable_slpc = 0;
+
+	if (guc_fw->major_ver_found != 9) {
+		DRM_INFO("SLPC not supported with current GuC firmware\n");
+		i915.enable_slpc = 0;
+	}
 }
 
 static u32 get_gttype(struct drm_i915_private *dev_priv)
-- 
1.9.1