linux-kernel - [PATCH AUTOSEL 6.12 172/486] crypto: mxs-dcp

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Message-Id: <20250505223922.2682012-172-sashal@kernel.org>
Date: Mon,  5 May 2025 18:34:08 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Sven Schwermer <sven@...nschwermer.de>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Sasha Levin <sashal@...nel.org>,
	davem@...emloft.net,
	shawnguo@...nel.org,
	linux-crypto@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.12 172/486] crypto: mxs-dcp - Only set OTP_KEY bit for OTP key

From: Sven Schwermer <sven@...nschwermer.de>

[ Upstream commit caa9dbb76ff52ec848a57245062aaeaa07740adc ]

While MXS_DCP_CONTROL0_OTP_KEY is set, the CRYPTO_KEY (DCP_PAES_KEY_OTP)
is used even if the UNIQUE_KEY (DCP_PAES_KEY_UNIQUE) is selected. This
is not clearly documented, but this implementation is consistent with
NXP's downstream kernel fork and optee_os.

Signed-off-by: Sven Schwermer <sven@...nschwermer.de>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/crypto/mxs-dcp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/mxs-dcp.c b/drivers/crypto/mxs-dcp.c
index 77a6301f37f0a..29c0c69d5905d 100644
--- a/drivers/crypto/mxs-dcp.c
+++ b/drivers/crypto/mxs-dcp.c
@@ -265,12 +265,12 @@ static int mxs_dcp_run_aes(struct dcp_async_ctx *actx,
 		    MXS_DCP_CONTROL0_INTERRUPT |
 		    MXS_DCP_CONTROL0_ENABLE_CIPHER;
 
-	if (key_referenced)
-		/* Set OTP key bit to select the key via KEY_SELECT. */
-		desc->control0 |= MXS_DCP_CONTROL0_OTP_KEY;
-	else
+	if (!key_referenced)
 		/* Payload contains the key. */
 		desc->control0 |= MXS_DCP_CONTROL0_PAYLOAD_KEY;
+	else if (actx->key[0] == DCP_PAES_KEY_OTP)
+		/* Set OTP key bit to select the key via KEY_SELECT. */
+		desc->control0 |= MXS_DCP_CONTROL0_OTP_KEY;
 
 	if (rctx->enc)
 		desc->control0 |= MXS_DCP_CONTROL0_CIPHER_ENCRYPT;
-- 
2.39.5