path: root/drivers
diff options
authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2020-07-01 08:21:40 +0200
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-07-19 14:17:16 +0200
commite80cdf0a3843fe570c891cb976feb0c136b19fb7 (patch)
tree84a5dc046abc638f0baab6c1c38d5675a67ada10 /drivers
parent3e33392a9561fd64515049317041646ab3bf32aa (diff)
media: v4l2-async: Log message in case of heterogeneous fwnode match
When a notifier supplies a device fwnode and a subdev supplies an endpoint fwnode, incorrect matches may occur if multiple subdevs correspond to the same device fwnode. This can't be handled transparently in the framework, and requires the notifier to switch to endpoint fwnodes. Log a message to notify of this problem. A second message is added to help accelerating the transition to endpoint matching. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org> Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers')
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 60833822ee89..e3ab003a6c85 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -77,6 +77,7 @@ static bool match_fwnode(struct v4l2_async_notifier *notifier,
struct fwnode_handle *dev_fwnode;
bool asd_fwnode_is_ep;
bool sd_fwnode_is_ep;
+ struct device *dev;
* Both the subdev and the async subdev can provide either an endpoint
@@ -114,7 +115,28 @@ static bool match_fwnode(struct v4l2_async_notifier *notifier,
- return dev_fwnode == other_fwnode;
+ if (dev_fwnode != other_fwnode)
+ return false;
+ /*
+ * We have a heterogeneous match. Retrieve the struct device of the side
+ * that matched on a device fwnode to print its driver name.
+ */
+ if (sd_fwnode_is_ep)
+ dev = notifier->v4l2_dev ? notifier->v4l2_dev->dev
+ : notifier->sd->dev;
+ else
+ dev = sd->dev;
+ if (dev && dev->driver) {
+ if (sd_fwnode_is_ep)
+ dev_warn(dev, "Driver %s uses device fwnode, incorrect match may occur\n",
+ dev->driver->name);
+ dev_notice(dev, "Consider updating driver %s to match on endpoints\n",
+ dev->driver->name);
+ }
+ return true;
static bool match_custom(struct v4l2_async_notifier *notifier,

Privacy Policy