Hi Laurent,
On Mon, Oct 12, 2020 at 02:00:30AM +0300, Laurent Pinchart wrote:
> > -static int drm_of_lvds_get_remote_pixels_type(
> > - const struct device_node *port_node)
> > +static int drm_of_lvds_get_remote_pixels_type(const struct device_node
> > *endpoint)
> > {
> > - struct device_node *endpoint = NULL;
> > - int pixels_type = -EPIPE;
> > + struct device_node *remote_port;
> > + int pixels_type;
> >
> > - for_each_child_of_node(port_node, endpoint) {
> > - struct device_node *remote_port;
> > - int current_pt;
> > -
> > - if (!of_node_name_eq(endpoint, "endpoint"))
> > - continue;
> > -
> > - remote_port = of_graph_get_remote_port(endpoint);
> > - if (!remote_port) {
> > - of_node_put(remote_port);
> > - return -EPIPE;
> > - }
> > -
> > - current_pt = drm_of_lvds_get_port_pixels_type(remote_port);
> > + remote_port = of_graph_get_remote_port(endpoint);
> > + if (!remote_port) {
> > of_node_put(remote_port);
>
> You can drop this line.
>
> > - if (pixels_type < 0)
> > - pixels_type = current_pt;
> > -
> > - /*
> > - * Sanity check, ensure that all remote endpoints have the same
> > - * pixel type. We may lift this restriction later if we need to
> > - * support multiple sinks with different dual-link
> > - * configurations by passing the endpoints explicitly to
> > - * drm_of_lvds_get_dual_link_pixel_order().
> > - */
>
> Shouldn't we keep this check when endpoint_id is -1 in
> drm_of_lvds_get_dual_link_pixel_order() ?I tried to do that, and I'm not quite really sure how to go around it. This scans all the endpoints in a given port. However, now that we have the device, port id and endpoint id, we need to use of_graph_get_port_by_id to get the port matching the device and port id, and iterate over all its endpoint as done here. The trouble is that of_graph_get_port_by_id expects a !const device_node, yet drm_of_lvds_get_dual_link_pixel_order (and seems to be doing so rightfully), so that creates a warning because we drop the const there. Changing the prototype to passing only the port device_node doesn't really work either, since it would be const, and we would need to call of_graph_get_endpoint_by_regs (so having the parent device_node, through of_graph_get_port_parent) and of_graph_get_port_parent takes a !const port device_node. I guess we could drop const entirely from our function, but that doesn't look right either.. Maxime
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