Hi Kieran,
On Tue, May 23, 2017 at 06:40:08PM +0100, Kieran Bingham wrote:
> On 23/05/17 14:02, Sakari Ailus wrote:
> > Hi Kieran,
> >
> > On Mon, May 22, 2017 at 06:36:38PM +0100, Kieran Bingham wrote:
> >> From: Kieran Bingham <[email protected]>
> >>
> >> Devices supporting multiple endpoints on a single device node must set
> >> their subdevice fwnode to the endpoint to allow distinct comparisons.
> >>
> >> Adapt the match_fwnode call to compare against the provided fwnodes
> >> first, but also to search for a comparison against the parent fwnode.
> >>
> >> This allows notifiers to pass the endpoint for comparison and still
> >> support existing subdevices which store their default parent device
> >> node.
> >>
> >> Signed-off-by: Kieran Bingham <[email protected]>
> >>
> >> ---
> >> v2:
> >> - Added documentation comments
> >> - simplified the OF match by adding match_fwnode_of()
> >>
> >> v3:
> >> - Fix comments
> >> - Fix sd_parent, and asd_parent usage
> >>
> >> drivers/media/v4l2-core/v4l2-async.c | 36 ++++++++++++++++++++++++-----
> >> 1 file changed, 31 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/drivers/media/v4l2-core/v4l2-async.c
> >> b/drivers/media/v4l2-core/v4l2-async.c
> >> index cbd919d4edd2..12c0707851fd 100644
> >> --- a/drivers/media/v4l2-core/v4l2-async.c
> >> +++ b/drivers/media/v4l2-core/v4l2-async.c
> >> @@ -41,14 +41,40 @@ static bool match_devname(struct v4l2_subdev *sd,
> >> return !strcmp(asd->match.device_name.name, dev_name(sd->dev));
> >> }
> >>
> >> +/*
> >> + * Check whether the two device_node pointers refer to the same OF node.
> >> We
> >> + * can't compare pointers directly as they can differ if overlays have
> >> been
> >> + * applied.
> >> + */
> >> +static bool match_fwnode_of(struct fwnode_handle *a, struct fwnode_handle
> >> *b)
> >> +{
> >> + return !of_node_cmp(of_node_full_name(to_of_node(a)),
> >> + of_node_full_name(to_of_node(b)));
> >> +}
> >> +
> >> +/*
> >> + * As a measure to support drivers which have not been converted to use
> >> + * endpoint matching, we also find the parent devices for cross-matching.
> >> + *
> >> + * When all devices use endpoint matching, this code can be simplified,
> >> and the
> >> + * parent comparisons can be removed.
> >> + */
> >> static bool match_fwnode(struct v4l2_subdev *sd, struct v4l2_async_subdev
> >> *asd)
> >> {
> >> - if (!is_of_node(sd->fwnode) || !is_of_node(asd->match.fwnode.fwnode))
> >> - return sd->fwnode == asd->match.fwnode.fwnode;
> >> + struct fwnode_handle *asd_fwnode = asd->match.fwnode.fwnode;
> >> + struct fwnode_handle *sd_parent, *asd_parent;
> >> +
> >> + sd_parent = fwnode_graph_get_port_parent(sd->fwnode);
> >> + asd_parent = fwnode_graph_get_port_parent(asd_fwnode);
> >> +
> >> + if (!is_of_node(sd->fwnode) || !is_of_node(asd_fwnode))
> >> + return sd->fwnode == asd_fwnode ||
> >> + sd_parent == asd_fwnode ||
> >> + sd->fwnode == asd_parent;
> >>
> >> - return !of_node_cmp(of_node_full_name(to_of_node(sd->fwnode)),
> >> - of_node_full_name(
> >> - to_of_node(asd->match.fwnode.fwnode)));
> >> + return match_fwnode_of(sd->fwnode, asd_fwnode) ||
> >> + match_fwnode_of(sd_parent, asd_fwnode) ||
> >> + match_fwnode_of(sd->fwnode, asd_parent);
> >> }
> >>
> >> static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev
> >> *asd)
> >
> > Would this become easier to read if you handled all matching in what is
> > called match_fwnode_of() above, also for non-OF fwnodes? Essentially you'd
> > have what used to be match_fwnode() there, and new match_fwnode() would call
> > that function with all the three combinations.
> >
>
>
> > I'd call the other function __match_fwnode() for instance.
> >
>
>
> Yes - Took me a moment to understand what you meant here - but yes it's
> leaner +
> cleaner:
Looks quite nice! Thanks! :)
>
>
> /*
> * As a measure to support drivers which have not been converted to use
> * endpoint matching, we also find the parent devices for cross-matching.
> *
> * When all devices use endpoint matching, this code can be simplified, and
> the
> * parent comparisons can be removed.
> */
>
> static bool __match_fwnode(struct fwnode_handle *a, struct fwnode_handle *b)
> {
> if (is_of_node(a) || is_of_node(b))
I think you need && (not ||) although in practice I don't think it'd have
made any difference.
> return !of_node_cmp(of_node_full_name(to_of_node(a)),
> of_node_full_name(to_of_node(b)));
> else
> return a == b;
> }
>
> static bool match_fwnode(struct v4l2_subdev *sd, struct v4l2_async_subdev
> *asd)
> {
> struct fwnode_handle *asd_fwnode = asd->match.fwnode.fwnode;
> struct fwnode_handle *sd_parent, *asd_parent;
>
> sd_parent = fwnode_graph_get_port_parent(sd->fwnode);
> asd_parent = fwnode_graph_get_port_parent(asd_fwnode);
>
> return __match_fwnode(sd->fwnode, asd_fwnode) ||
> __match_fwnode(sd_parent, asd_fwnode) ||
> __match_fwnode(sd->fwnode, asd_parent);
> }
>
--
Kind regards,
Sakari Ailus
e-mail: [email protected] XMPP: [email protected]
