On 27/10/20 07:00, Jie Deng wrote:
> +The driver queues requests to the virtqueue, and they are used by the
> +device. The request is the representation of one segment of an I2C
> +transaction. Each request is of form:
> +
> +\begin{lstlisting}
> +struct virtio_i2c_req {
> + le16 addr;
> + le16 flags;
> + le16 len;
> + u8 buf[];
> + u8 status;
> +};
> +\end{lstlisting}
Hi,
one extremely common two-segment I2C transaction is not reproducible
with virtio-i2c. This is when a write is followed by a read: the master
starts off the transmission with a write, then sends a second START,
then continues with a read from the same address.
Would it make sense to define the request like
struct virtio_i2c_req {
le16 addr;
le16 written;
le16 read;
u8 bufwrite[];
u8 status;
u8 bufread[];
};
instead?
Thanks,
Paolo
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