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usb: typec: mux: avoid duplicated mux switches

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Some devices use combo PHYs (i.e. USB3 + DisplayPort), which also
handle the lane muxing. These PHYs are referenced twice from
the USB-C connector (USB super-speed lines and SBU/AUX lines)
resulting in the mux being configured twice. Avoid this by
dropping duplicates.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260223-typec-mux-duplication-fix-v2-2-0402fefc222e@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Reichel
2026-02-23 19:27:39 +01:00
committed by Greg Kroah-Hartman
parent a53b4f9c51
commit b145c3f29d
1 changed files with 12 additions and 1 deletions
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13
drivers/usb/typec/mux.c
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@@ -275,7 +275,9 @@ static int mux_fwnode_match(struct device *dev, const void *fwnode)
static void *typec_mux_match(const struct fwnode_handle *fwnode,
const char *id, void *data)
{
struct typec_mux_dev **mux_devs = data;
struct device *dev;
int i;
/*
* Device graph (OF graph) does not give any means to identify the
@@ -291,6 +293,14 @@ static void *typec_mux_match(const struct fwnode_handle *fwnode,
dev = class_find_device(&typec_mux_class, NULL, fwnode,
mux_fwnode_match);
/* Skip duplicates */
for (i = 0; i < TYPEC_MUX_MAX_DEVS; i++)
if (to_typec_mux_dev(dev) == mux_devs[i]) {
put_device(dev);
return NULL;
}
return dev ? to_typec_mux_dev(dev) : ERR_PTR(-EPROBE_DEFER);
}
@@ -316,7 +326,8 @@ struct typec_mux *fwnode_typec_mux_get(struct fwnode_handle *fwnode)
return ERR_PTR(-ENOMEM);
count = fwnode_connection_find_matches(fwnode, "mode-switch",
NULL, typec_mux_match,
(void **)mux_devs,
typec_mux_match,
(void **)mux_devs,
ARRAY_SIZE(mux_devs));
if (count <= 0) {