crypto: inside-secure - make the context control size dynamic

This patch makes the context control size computation dynamic, not to
rely on hardcoded values. This is better for the future, and will help
adding the AEAD support.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/inside-secure/safexcel_cipher.c

@@ -118,21 +118,20 @@ static int safexcel_context_control(struct safexcel_cipher_ctx *ctx,
 	switch (ctx->key_len) {
 	case AES_KEYSIZE_128:
 		cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES128;
-		ctrl_size = 4;
 		break;
 	case AES_KEYSIZE_192:
 		cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES192;
-		ctrl_size = 6;
 		break;
 	case AES_KEYSIZE_256:
 		cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES256;
-		ctrl_size = 8;
 		break;
 	default:
 		dev_err(priv->dev, "aes keysize not supported: %u\n",
 			ctx->key_len);
 		return -EINVAL;
 	}
+
+	ctrl_size = ctx->key_len / sizeof(u32);
 	cdesc->control_data.control0 |= CONTEXT_CONTROL_SIZE(ctrl_size);
 
 	return 0;