[Intel-xe] [PATCH 3/4] drm/xe/huc: Don't re-auth HuC if it's already authenticated

[Daniele Ceraolo Spurio]

On newer platforms the HuC survives reset and stays authenticated, so no
need to re-authenticate it.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Alan Previn <alan.previn.teres.alexis at intel.com>
Cc: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/xe/xe_huc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_huc.c b/drivers/gpu/drm/xe/xe_huc.c
index 700c43fe287b..d753d2eb8954 100644
--- a/drivers/gpu/drm/xe/xe_huc.c
+++ b/drivers/gpu/drm/xe/xe_huc.c
@@ -214,6 +214,12 @@ int xe_huc_auth(struct xe_huc *huc)
 
 	xe_assert(xe, !xe_uc_fw_is_running(&huc->fw));
 
+	/* On newer platforms the HuC survives reset, so no need to re-auth */
+	if (xe_mmio_read32(gt, HUC_KERNEL_LOAD_INFO) & HUC_LOAD_SUCCESSFUL) {
+		xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_RUNNING);
+		return 0;
+	}
+
 	if (!xe_uc_fw_is_loaded(&huc->fw))
 		return -ENOEXEC;
 
-- 
2.41.0