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From: Alexey Romanov <avromanov@salutedevices.com>
To: <neil.armstrong@linaro.org>, <clabbe@baylibre.com>,
	<herbert@gondor.apana.org.au>, <davem@davemloft.net>, <robh+dt@kernel.org>,
	<krzysztof.kozlowski+dt@linaro.org>, <conor+dt@kernel.org>,
	<khilman@baylibre.com>, <jbrunet@baylibre.com>,
	<martin.blumenstingl@googlemail.com>
CC: <linux-crypto@vger.kernel.org>, <linux-amlogic@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>, <kernel@salutedevices.com>, Alexey
 Romanov <avromanov@salutedevices.com>
Subject: [PATCH v3 13/20] drivers: crypto: meson: use fallback for 192-bit keys
Date: Mon, 5 Feb 2024 18:55:14 +0300
Message-ID: <20240205155521.1795552-14-avromanov@salutedevices.com>
In-Reply-To: <20240205155521.1795552-1-avromanov@salutedevices.com>
References: <20240205155521.1795552-1-avromanov@salutedevices.com>
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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 <avromanov@salutedevices.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 828109f4a1c3..da593130553e 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(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 f3b5e004b3a5..429c3474028b 100644
--- a/drivers/crypto/amlogic/amlogic-gxl-core.c
+++ b/drivers/crypto/amlogic/amlogic-gxl-core.c
@@ -215,6 +215,7 @@ static const struct meson_pdata meson_gxl_pdata = {
 	.status_reg = 0x4,
 	.need_clk = true,
 	.setup_desc_cnt = 3,
+	.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 7f6d91e7b365..2d2777a25453 100644
--- a/drivers/crypto/amlogic/amlogic-gxl.h
+++ b/drivers/crypto/amlogic/amlogic-gxl.h
@@ -98,12 +98,14 @@ struct meson_flow {
  * @reg_status:	offset to status register
  * @need_clk:	clock input is needed
  * @setup_desc_cnt:	number of setup descriptor to configure.
+ * @support_192bit_key:	indicates whether platform support AES 192-bit key
  */
 struct meson_pdata {
 	u32 descs_reg;
 	u32 status_reg;
 	bool need_clk;
 	u32 setup_desc_cnt;
+	bool support_192bit_key;
 };
 
 /*
-- 
2.34.1