linux-kernel - [PATCH v12 12/22] crypto: amlogic

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Message-Id: <20250624135214.1355051-13-romanov.alexey2000@gmail.com>
Date: Tue, 24 Jun 2025 16:52:04 +0300
From: Alexey Romanov <romanov.alexey2000@...il.com>
To: neil.armstrong@...aro.org,
	clabbe@...libre.com,
	herbert@...dor.apana.org.au,
	davem@...emloft.net,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	khilman@...libre.com,
	jbrunet@...libre.com,
	martin.blumenstingl@...glemail.com
Cc: linux-crypto@...r.kernel.org,
	linux-amlogic@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Alexey Romanov <romanov.alexey2000@...il.com>
Subject: [PATCH v12 12/22] crypto: amlogic - Use fallback for 192-bit keys

Unforunately, not all Amlogic SoC's have a 192-bit key
support for AES algo. In this case, use fallback.

Signed-off-by: Alexey Romanov <romanov.alexey2000@...il.com>
---
 drivers/crypto/amlogic/amlogic-gxl-cipher.c | 7 +++++++
 drivers/crypto/amlogic/amlogic-gxl-core.c   | 1 +
 drivers/crypto/amlogic/amlogic-gxl.h        | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/drivers/crypto/amlogic/amlogic-gxl-cipher.c b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
index df42940f1112..6070ee6b488e 100644
--- a/drivers/crypto/amlogic/amlogic-gxl-cipher.c
+++ b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
@@ -41,6 +41,13 @@ static bool meson_cipher_need_fallback_sg(struct skcipher_request *areq,
 
 static bool meson_cipher_need_fallback(struct skcipher_request *areq)
 {
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+	struct meson_cipher_tfm_ctx *op = crypto_skcipher_ctx_dma(tfm);
+	struct meson_dev *mc = op->mc;
+
+	if (op->keymode == DESC_MODE_AES_192 && !mc->pdata->support_192bit_key)
+		return true;
+
 	if (areq->cryptlen == 0)
 		return true;
 
diff --git a/drivers/crypto/amlogic/amlogic-gxl-core.c b/drivers/crypto/amlogic/amlogic-gxl-core.c
index 706db22b9f65..0f4b3db85031 100644
--- a/drivers/crypto/amlogic/amlogic-gxl-core.c
+++ b/drivers/crypto/amlogic/amlogic-gxl-core.c
@@ -279,6 +279,7 @@ static const struct meson_pdata meson_gxl_pdata = {
 	.status_reg = 0x4,
 	.setup_desc_cnt = 3,
 	.hasher_supported = false,
+	.support_192bit_key = true,
 };
 
 static const struct of_device_id meson_crypto_of_match_table[] = {
diff --git a/drivers/crypto/amlogic/amlogic-gxl.h b/drivers/crypto/amlogic/amlogic-gxl.h
index c4f65b541f83..1a15e6c0bf50 100644
--- a/drivers/crypto/amlogic/amlogic-gxl.h
+++ b/drivers/crypto/amlogic/amlogic-gxl.h
@@ -94,12 +94,14 @@ struct meson_flow {
  * @reg_status:	offset to status register
  * @setup_desc_cnt:	number of setup descriptor to configure.
  * @hasher_supported:	indecates whether hasher is supported.
+ * @support_192bit_key:	indicates whether platform support AES 192-bit key
  */
 struct meson_pdata {
 	u32 descs_reg;
 	u32 status_reg;
 	u32 setup_desc_cnt;
 	bool hasher_supported;
+	bool support_192bit_key;
 };
 
 /*
-- 
2.34.1