[U-Boot] [PATCH] drivers: optee: rpmb: fix returning CID to TEE

Jorge Ramirez-Ortiz jorge at foundries.io
Tue Nov 26 16:19:34 UTC 2019

The mmc CID value is one of the input parameters used to provision the
RPMB key. The trusted execution environment expects this value to be
specified in big endian format.

Before this fix, on little endian systems, the value returned by the
linux kernel mmc driver differed from the one returned by u-boot.
This meant that if linux provisioned the RPMB key, u-boot would not
have access to the partition (and the other way around).

Signed-off-by: Jorge Ramirez-Ortiz <jorge at foundries.io>
 drivers/tee/optee/rpmb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/tee/optee/rpmb.c b/drivers/tee/optee/rpmb.c
index 955155b3f8..cf1ce77e6e 100644
--- a/drivers/tee/optee/rpmb.c
+++ b/drivers/tee/optee/rpmb.c
@@ -98,6 +98,7 @@ static struct mmc *get_mmc(struct optee_private *priv, int dev_id)
 static u32 rpmb_get_dev_info(u16 dev_id, struct rpmb_dev_info *info)
 	struct mmc *mmc = find_mmc_device(dev_id);
+	int i;
 	if (!mmc)
@@ -105,7 +106,9 @@ static u32 rpmb_get_dev_info(u16 dev_id, struct rpmb_dev_info *info)
 	if (!mmc->ext_csd)
-	memcpy(info->cid, mmc->cid, sizeof(info->cid));
+	for (i = 0; i < ARRAY_SIZE(mmc->cid); i++)
+		((u32 *) info->cid)[i] = cpu_to_be32(mmc->cid[i]);
 	info->rel_wr_sec_c = mmc->ext_csd[222];
 	info->rpmb_size_mult = mmc->ext_csd[168];
 	info->ret_code = RPMB_CMD_GET_DEV_INFO_RET_OK;

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