On Wed, Sep 23, 2020 at 12:13:53PM +1000, Sam McNally wrote:
> From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>
> For adapters behind an MST hub use the correct AUX channel.
>
> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> [sammc@xxxxxxxxxxxx: rebased, removing redundant changes]
> Signed-off-by: Sam McNally <sammc@xxxxxxxxxxxx>
> ---
>
> (no changes since v1)
>
> drivers/gpu/drm/drm_dp_mst_topology.c | 36 +++++++++++++++++++++++++++
> 1 file changed, 36 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 15b6cc39a754..0d753201adbd 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -2255,6 +2255,9 @@ drm_dp_mst_topology_unlink_port(struct drm_dp_mst_topology_mgr *mgr,
> drm_dp_mst_topology_put_port(port);
> }
>
> +static ssize_t
> +drm_dp_mst_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg);
> +
> static struct drm_dp_mst_port *
> drm_dp_mst_add_port(struct drm_device *dev,
> struct drm_dp_mst_topology_mgr *mgr,
> @@ -2271,9 +2274,13 @@ drm_dp_mst_add_port(struct drm_device *dev,
> port->port_num = port_number;
> port->mgr = mgr;
> port->aux.name = "DPMST";
> + mutex_init(&port->aux.hw_mutex);
> + mutex_init(&port->aux.cec.lock);
> port->aux.dev = dev->dev;
> port->aux.is_remote = true;
>
> + port->aux.transfer = drm_dp_mst_aux_transfer;
> +
This was supposed to be handled via higher levels checking for
is_remote==true.
> /* initialize the MST downstream port's AUX crc work queue */
> drm_dp_remote_aux_init(&port->aux);
>
> @@ -3503,6 +3510,35 @@ static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
> return 0;
> }
>
> +static ssize_t
> +drm_dp_mst_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
> +{
> + struct drm_dp_mst_port *port =
> + container_of(aux, struct drm_dp_mst_port, aux);
> + int ret;
> +
> + switch (msg->request & ~DP_AUX_I2C_MOT) {
> + case DP_AUX_NATIVE_WRITE:
> + case DP_AUX_I2C_WRITE:
> + case DP_AUX_I2C_WRITE_STATUS_UPDATE:
> + ret = drm_dp_send_dpcd_write(port->mgr, port, msg->address,
> + msg->size, msg->buffer);
That doesn't make sense to me. I2c writes and DPCD writes
are definitely not the same thing.
aux->transfer is a very low level thing. I don't think it's the
correct level of abstraction for sideband.
> + break;
> +
> + case DP_AUX_NATIVE_READ:
> + case DP_AUX_I2C_READ:
> + ret = drm_dp_send_dpcd_read(port->mgr, port, msg->address,
> + msg->size, msg->buffer);
> + break;
> +
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +
> static int drm_dp_get_vc_payload_bw(u8 dp_link_bw, u8 dp_link_count)
> {
> if (dp_link_bw == 0 || dp_link_count == 0)
> --
> 2.28.0.681.g6f77f65b4e-goog
>
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--
Ville Syrjälä
Intel
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