Re: [PATCH v3 13/13] platform/x86: intel_cht_int33fe: Replacing the old connections with references

[Hans de Goede <hdegoede@redhat.com>]

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Hi,

On 17-04-19 11:19, Hans de Goede wrote:
> Note that another problem with this series which I noticed while testing
> is that the usb-role-switch is not being found at all anymore after
> this ("Replacing the old connections with references") patch. I still need
> start debugging that.

Ok, I've just finished debugging this and I'm attaching 2 FIXUP
patches (to be squased) and a new patch, which those 3 small fixes
added the problem of tcpm.c being unable to get the role-switch
goes away.

The second FIXUP patch might be a bit controversial; and we may
need another solution for the problem it fixes. I've tried to
explain it in more detail in the commit msg.

Regards,

Hans

[-- Attachment #2: 0001-FIXUP-platform-x86-intel_cht_int33fe-Link-with-exter.patch --]
[-- Type: text/x-patch, Size: 1139 bytes --]

From 3a2e047608a53caaefe8364eceb7e315ec413698 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 17 Apr 2019 22:54:47 +0200
Subject: [PATCH v2 1/3] FIXUP: "platform/x86: intel_cht_int33fe: Link with
 external dependencies using fwnodes"

In the else path of: if (dev->fwnode) ... else ..., we should set
dev->fwnode to our own fwnode not to dev->fwnode, which is NULL as we
just tested.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/intel_cht_int33fe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe.c
index e6a1ea7f33af..07bf92ece6cd 100644
--- a/drivers/platform/x86/intel_cht_int33fe.c
+++ b/drivers/platform/x86/intel_cht_int33fe.c
@@ -189,7 +189,7 @@ static int cht_int33fe_setup_mux(struct cht_int33fe_data *data)
 		data->node[INT33FE_NODE_ROLE_SWITCH] = dev->fwnode;
 	} else {
 		/* The node can be tied to the lifetime of the device. */
-		dev->fwnode = fwnode_handle_get(dev->fwnode);
+		dev->fwnode = fwnode_handle_get(fwnode);
 	}
 
 	put_device(dev);
-- 
2.21.0


[-- Attachment #3: 0002-FIXUP-device-connection-Find-connections-also-by-che.patch --]
[-- Type: text/x-patch, Size: 1923 bytes --]

From 5133467f116dff6e111d4bc0610ccbcedb397f1d Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 17 Apr 2019 23:00:59 +0200
Subject: [PATCH v2 2/3] FIXUP: "device connection: Find connections also by
 checking the references"

The reference we are looking for might be in a child node, rather then
directly in the device's own fwnode. A typical example of this is a
usb connector node with references to various muxes / switches.

Note that we do not hit this problem for the device_connection_find_match
calls in typec_switch_get and typec_mux_get because these get called
from typec_register_port and typec_register_port creates a new device
with its fwnode pointing to the usb-connector fwnode and that new
device (rather then the parent) is passed to typec_switch/mux_get and
thus to device_connection_find_match.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/base/devcon.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index 4cdf95532b63..6f6f870c21eb 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -76,7 +76,7 @@ fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
 void *device_connection_find_match(struct device *dev, const char *con_id,
 				   void *data, devcon_match_fn_t match)
 {
-	struct fwnode_handle *fwnode = dev_fwnode(dev);
+	struct fwnode_handle *child, *fwnode = dev_fwnode(dev);
 	const char *devname = dev_name(dev);
 	struct device_connection *con;
 	void *ret = NULL;
@@ -93,6 +93,12 @@ void *device_connection_find_match(struct device *dev, const char *con_id,
 		ret = fwnode_devcon_match(fwnode, con_id, data, match);
 		if (ret)
 			return ret;
+
+		fwnode_for_each_child_node(fwnode, child) {
+			ret = fwnode_devcon_match(child, con_id, data, match);
+			if (ret)
+				return ret;
+		}
 	}
 
 	mutex_lock(&devcon_lock);
-- 
2.21.0


[-- Attachment #4: 0003-usb-roles-Check-for-NULL-con_id.patch --]
[-- Type: text/x-patch, Size: 1140 bytes --]

From a69f76993dfe5f43d3e6c4b2bcfbaacf2c247d6e Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 17 Apr 2019 22:57:00 +0200
Subject: [PATCH v2 3/3] usb: roles: Check for NULL con_id

When usb_role_switch_match gets called by device_connection_find_match
because of a fwnode_reference matching the con_id passed to
device_connection_find_match, then con->id will be NULL and in this
case we do not need to check it since our caller has already checked it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/usb/roles/class.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index f45d8df5cfb8..86defca6623e 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -101,7 +101,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
 	struct device *dev;
 
 	if (con->fwnode) {
-		if (!fwnode_property_present(con->fwnode, con->id))
+		if (con->id && !fwnode_property_present(con->fwnode, con->id))
 			return NULL;
 
 		dev = class_find_device(role_class, NULL, con->fwnode,
-- 
2.21.0