[PATCH] drivers: optee: i2c: add bus retry configuration

[Jorge Ramirez-Ortiz]

Allow OP-TEE to specify the number of retries in the adaptor.

Signed-off-by: Jorge Ramirez-Ortiz <jo...@foundries.io>
---
 drivers/tee/optee/rpc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c
index 1e3614e4798f..2d46a9ecb1de 100644
--- a/drivers/tee/optee/rpc.c
+++ b/drivers/tee/optee/rpc.c
@@ -58,6 +58,7 @@ static void handle_rpc_func_cmd_i2c_transfer(struct 
tee_context *ctx,
        struct tee_param *params;
        size_t i;
        int ret = -EOPNOTSUPP;
+       int retries = 0;
        u8 attr[] = {
                TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
                TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
@@ -102,12 +103,17 @@ static void handle_rpc_func_cmd_i2c_transfer(struct 
tee_context *ctx,
        client.addr = params[0].u.value.c;
        snprintf(client.name, I2C_NAME_SIZE, "i2c%d", client.adapter->nr);
 
+       /* cache the current value */
+       retries = client.adapter->retries;
+
        switch (params[0].u.value.a) {
        case OPTEE_MSG_RPC_CMD_I2C_TRANSFER_RD:
+               client.adapter->retries = params[1].u.value.b;
                ret = i2c_master_recv(&client, params[2].u.memref.shm->kaddr,
                                      params[2].u.memref.size);
                break;
        case OPTEE_MSG_RPC_CMD_I2C_TRANSFER_WR:
+               client.adapter->retries = params[1].u.value.b;
                ret = i2c_master_send(&client, params[2].u.memref.shm->kaddr,
                                      params[2].u.memref.size);
                break;
@@ -126,6 +132,7 @@ static void handle_rpc_func_cmd_i2c_transfer(struct 
tee_context *ctx,
                        arg->ret = TEEC_SUCCESS;
        }
 
+       client.adapter->retries = retries;
        i2c_put_adapter(client.adapter);
        kfree(params);
        return;
-- 
2.17.1