From: Ye Li <ye...@nxp.com>

issue:
CAAM fails with key error when perform Modular Exponentiation
using PKHA Block in CAAM

Fix:
add flush and invalidate dcache for keys, signature
and output decrypted data processed by CAAM.

Fixes: 34276478f7 (DM: crypto/fsl - Add Freescale rsa DM driver)
Signed-off-by: Ye Li <ye...@nxp.com>
Reviewed-by: Gaurav Jain <gaurav.j...@nxp.com>
Acked-by: Peng Fan <peng....@nxp.com>
---
 drivers/crypto/fsl/fsl_rsa.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/crypto/fsl/fsl_rsa.c b/drivers/crypto/fsl/fsl_rsa.c
index 897ee855ea..7ea0c193f9 100644
--- a/drivers/crypto/fsl/fsl_rsa.c
+++ b/drivers/crypto/fsl/fsl_rsa.c
@@ -36,12 +36,21 @@ int fsl_mod_exp(struct udevice *dev, const uint8_t *sig, 
uint32_t sig_len,
 
        inline_cnstr_jobdesc_pkha_rsaexp(desc, &pkin, out, sig_len);
 
+       flush_dcache_range((ulong)sig, (ulong)(sig + sig_len));
+       flush_dcache_range((ulong)prop->modulus, (ulong)(prop->modulus) + 
keylen);
+       flush_dcache_range((ulong)prop->public_exponent,
+                          (ulong)(prop->public_exponent) + prop->exp_len);
+       flush_dcache_range((ulong)desc, (ulong)desc + (sizeof(uint32_t) * 
MAX_CAAM_DESCSIZE));
+       flush_dcache_range((ulong)out, (ulong)out + sig_len);
+
        ret = run_descriptor_jr(desc);
        if (ret) {
                debug("%s: RSA failed to verify: %d\n", __func__, ret);
                return -EFAULT;
        }
 
+       invalidate_dcache_range((ulong)out, (ulong)sig_len);
+
        return 0;
 }
 
-- 
2.25.1

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