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From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
To: linux-media@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org,
	"Sakari Ailus" <sakari.ailus@iki.fi>,
	"Jacopo Mondi" <jacopo+renesas@jmondi.org>,
	"Niklas Söderlund" <niklas.soderlund@ragnatech.se>,
	"Kieran Bingham" <kieran.bingham+renesas@ideasonboard.com>,
	"Lad Prabhakar" <prabhakar.csengg@gmail.com>
Subject: [PATCH v4 4/4] media: v4l2-async: Log message in case of heterogeneous fwnode match
Date: Wed,  1 Jul 2020 09:21:40 +0300
Message-ID: <20200701062140.12953-5-laurent.pinchart+renesas@ideasonboard.com> (raw)
In-Reply-To: <20200701062140.12953-1-laurent.pinchart+renesas@ideasonboard.com>

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>
---
Changes since v2:

- Use dev_warn() and dev_notice()
- Fix typo
---
 drivers/media/v4l2-core/v4l2-async.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

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,
 
 	fwnode_handle_put(dev_fwnode);
 
-	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,
-- 
Regards,

Laurent Pinchart


      parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-01  6:21 [PATCH v4 0/4] media: v4l2-async: Accept endpoints and devices for fwnode matching Laurent Pinchart
2020-07-01  6:21 ` [PATCH v4 1/4] device property: Add a function to test is a fwnode is a graph endpoint Laurent Pinchart
2020-07-01  7:34   ` Sakari Ailus
2020-07-01 12:19     ` Rafael J. Wysocki
2020-07-01 17:06   ` Niklas Söderlund
2020-07-01 18:46   ` Lad, Prabhakar
2020-07-01 21:03   ` Kieran Bingham
2020-07-01  6:21 ` [PATCH v4 2/4] media: v4l2-async: Accept endpoints and devices for fwnode matching Laurent Pinchart
2020-07-01  6:21 ` [PATCH v4 3/4] media: v4l2-async: Pass notifier pointer to match functions Laurent Pinchart
2020-07-01  6:21 ` Laurent Pinchart [this message]

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