drm/i915/huc: Check HuC status in dedicated function

We try to keep all HuC related code in dedicated file.
There is no need to peek HuC register directly during
handling getparam ioctl.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180314200429.40132-1-michal.wajdeczko@intel.com

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_huc.c b/drivers/gpu/drm/i915/intel_huc.c
index 1d6c47b17935..291285277403 100644
--- a/drivers/gpu/drm/i915/intel_huc.c
+++ b/drivers/gpu/drm/i915/intel_huc.c
@@ -92,3 +92,28 @@ fail:
 	DRM_ERROR("HuC: Authentication failed %d\n", ret);
 	return ret;
 }
+
+/**
+ * intel_huc_check_status() - check HuC status
+ * @huc: intel_huc structure
+ *
+ * This function reads status register to verify if HuC
+ * firmware was successfully loaded.
+ *
+ * Returns positive value if HuC firmware is loaded and verified
+ * and -ENODEV if HuC is not present.
+ */
+int intel_huc_check_status(struct intel_huc *huc)
+{
+	struct drm_i915_private *dev_priv = huc_to_i915(huc);
+	u32 status;
+
+	if (!HAS_HUC(dev_priv))
+		return -ENODEV;
+
+	intel_runtime_pm_get(dev_priv);
+	status = I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED;
+	intel_runtime_pm_put(dev_priv);
+
+	return status;
+}