linux-kernel - [PATCH] firmware: xilinx: fix feature check logic for TF-A specific APIs

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Message-ID: <20240920055546.2658783-1-ronak.jain@amd.com>
Date: Thu, 19 Sep 2024 22:55:46 -0700
From: Ronak Jain <ronak.jain@....com>
To: <michal.simek@....com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] firmware: xilinx: fix feature check logic for TF-A specific APIs

Currently, Linux is passing only API ID for feature of TF-A specific
APIs but for feature check of TF-A specific APIs, TF-A is checking
for Module ID + API ID as a result incorrect version is received for
all TF-A specific APIs. So, fix feature check logic to pass valid
arguments to get correct version.

Signed-off-by: Ronak Jain <ronak.jain@....com>
Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@....com>
---
 drivers/firmware/xilinx/zynqmp.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 5ab0dfb2b225..0b2ad46c8bce 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -225,11 +225,14 @@ static int __do_feature_check_call(const u32 api_id, u32 *ret_payload)
 	 * Feature check of TF-A APIs is done in the TF-A layer and it expects for
 	 * MODULE_ID_MASK bits of SMC's arg[0] to be the same as PM_MODULE_ID.
 	 */
-	if (module_id == TF_A_MODULE_ID)
+	if (module_id == TF_A_MODULE_ID) {
 		module_id = PM_MODULE_ID;
+		smc_arg[1] = api_id;
+	} else {
+		smc_arg[1] = (api_id & API_ID_MASK);
+	}
 
 	smc_arg[0] = PM_SIP_SVC | FIELD_PREP(MODULE_ID_MASK, module_id) | feature_check_api_id;
-	smc_arg[1] = (api_id & API_ID_MASK);
 
 	ret = do_fw_call(ret_payload, 2, smc_arg[0], smc_arg[1]);
 	if (ret)
-- 
2.25.1