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

Jens Wiklander
2020-09-22T16:39:06Z

On Wed, Sep 16, 2020 at 05:27:32PM +0200, Jorge Ramirez-Ortiz wrote:
> Allow OP-TEE to specify the number of retries in the adaptor.
>
> Signed-off-by: Jorge Ramirez-Ortiz <jorge@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;
Do we need to take any locks befor this?

Cheers,
Jens

> 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
>