[PATCH 1/2] firmware: stratix10-svc: handle NO_RESPONSE in async poll

[Adrian Ng Ho Yin]

Define INTEL_SIP_SMC_STATUS_NO_RESPONSE (0x3) and handle it in
stratix10_svc_async_poll() the same way as INTEL_SIP_SMC_STATUS_BUSY,
returning -EAGAIN so callers can retry instead of treating the poll as
a hard failure.

When the Secure Device Manager has not yet produced a response for an
asynchronous transaction, ATF is expected to return
INTEL_SIP_SMC_STATUS_NO_RESPONSE. Without this handling, the service
layer maps the status to -EINVAL and async clients cannot distinguish
"not ready yet" from a real error.

Signed-off-by: Adrian Ng Ho Yin <adrian.ho.yin.ng@xxxxxxxxxx>
---
 drivers/firmware/stratix10-svc.c             | 5 +++--
 include/linux/firmware/intel/stratix10-smc.h | 4 ++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
index 4140cc488d96..e89fa198688f 100644
--- a/drivers/firmware/stratix10-svc.c
+++ b/drivers/firmware/stratix10-svc.c
@@ -1569,8 +1569,9 @@ int stratix10_svc_async_poll(struct stratix10_svc_chan *chan,
 			WARN_ON_ONCE(1);
 		}
 		return 0;
-	} else if (handle->res.a0 == INTEL_SIP_SMC_STATUS_BUSY) {
-		dev_dbg(ctrl->dev, "async message is still in progress\n");
+	} else if (handle->res.a0 == INTEL_SIP_SMC_STATUS_BUSY ||
+		   handle->res.a0 == INTEL_SIP_SMC_STATUS_NO_RESPONSE) {
+		dev_dbg(ctrl->dev, "async message is not ready yet\n");
 		return -EAGAIN;
 	}
 
diff --git a/include/linux/firmware/intel/stratix10-smc.h b/include/linux/firmware/intel/stratix10-smc.h
index daa693699c97..2bb7f8427a47 100644
--- a/include/linux/firmware/intel/stratix10-smc.h
+++ b/include/linux/firmware/intel/stratix10-smc.h
@@ -67,6 +67,9 @@
  * INTEL_SIP_SMC_STATUS_REJECTED:
  * Secure monitor software reject the service client's request.
  *
+ * INTEL_SIP_SMC_STATUS_NO_RESPONSE:
+ * Secure monitor software has no response for the request yet.
+ *
  * INTEL_SIP_SMC_STATUS_ERROR:
  * There is error during the process of service request.
  *
@@ -77,6 +80,7 @@
 #define INTEL_SIP_SMC_STATUS_OK				0x0
 #define INTEL_SIP_SMC_STATUS_BUSY			0x1
 #define INTEL_SIP_SMC_STATUS_REJECTED			0x2
+#define INTEL_SIP_SMC_STATUS_NO_RESPONSE		0x3
 #define INTEL_SIP_SMC_STATUS_ERROR			0x4
 #define INTEL_SIP_SMC_RSU_ERROR				0x7
 
-- 
2.49.GIT