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[84.106.84.65]) by smtp.gmail.com with ESMTPSA id l18sm16411220edc.17.2019.04.17.04.15.34 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Wed, 17 Apr 2019 04:15:35 -0700 (PDT) Subject: Re: [PATCH v3 13/13] platform/x86: intel_cht_int33fe: Replacing the old connections with references To: Heikki Krogerus Cc: "Rafael J. Wysocki" , Greg Kroah-Hartman , Darren Hart , Andy Shevchenko , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, Andy Shevchenko References: <20190412134122.82903-1-heikki.krogerus@linux.intel.com> <20190412134122.82903-14-heikki.krogerus@linux.intel.com> <20190417063918.GI1747@kuha.fi.intel.com> <76d9ab79-a1d0-f3cd-ba5d-2325740c72ff@redhat.com> <20190417093252.GO1747@kuha.fi.intel.com> <9304d771-df1f-aea4-43d2-7db540953cdd@redhat.com> <20190417110413.GR1747@kuha.fi.intel.com> From: Hans de Goede Message-ID: <733600c0-c216-5159-5f7c-b1114593f5de@redhat.com> Date: Wed, 17 Apr 2019 13:15:34 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190417110413.GR1747@kuha.fi.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 17-04-19 13:04, Heikki Krogerus wrote: > On Wed, Apr 17, 2019 at 11:52:15AM +0200, Hans de Goede wrote: >> Hi, >> >> On 17-04-19 11:32, Heikki Krogerus wrote: >>> On Wed, Apr 17, 2019 at 11:19:28AM +0200, Hans de Goede wrote: >>>> Hi, >>>> >>>> On 17-04-19 08:39, Heikki Krogerus wrote: >>>>> On Tue, Apr 16, 2019 at 11:35:36PM +0200, Hans de Goede wrote: >>>>>> Hi, >>>>>> >>>>>> On 12-04-19 15:41, Heikki Krogerus wrote: >>>>>>> Now that the software nodes support references, and the >>>>>>> device connection API support parsing fwnode references, >>>>>>> replacing the old connection descriptions with software node >>>>>>> references. Relying on device names when matching the >>>>>>> connection would not have been possible to link the USB >>>>>>> Type-C connector and the DisplayPort connector together, but >>>>>>> with real references it's not problem. >>>>>>> >>>>>>> The DisplayPort ACPI node is dag up, and the drivers own >>>>>>> software node for the DisplayPort is set as the secondary >>>>>>> node for it. The USB Type-C connector refers the software >>>>>>> node, but it is now tied to the ACPI node, and therefore any >>>>>>> device entry (struct drm_connector in practice) that the >>>>>>> node combo is assigned to. >>>>>>> >>>>>>> The USB role switch device does not have ACPI node, so we >>>>>>> have to wait for the device to appear. Then we can simply >>>>>>> assign our software node for the to the device. >>>>>>> >>>>>>> Reviewed-by: Andy Shevchenko >>>>>>> Signed-off-by: Heikki Krogerus >>>>>> >>>>>> So as promised I've been testing this series and this commit >>>>>> breaks type-c functionality on devices using this driver. >>>>>> >>>>>> The problem is that typec_switch_get() and typec_mux_get() >>>>>> after this both return the same pointer, which is pointing >>>>>> to the switch, so typec_mux_get() is returning the wrong >>>>>> pointer. >>>>>> >>>>>> This is not surprising since the references for both are >>>>>> both pointing to the fwnode attached to the piusb30532 devices: >>>>>> >>>>>> args[0].fwnode = data->node[INT33FE_NODE_PI3USB30532]; >>>>>> >>>>>> So the class_find_device here: >>>>>> >>>>>> static void *typec_switch_match(struct device_connection *con, int ep, >>>>>> void *data) >>>>>> { >>>>>> struct device *dev; >>>>>> >>>>>> if (con->fwnode) { >>>>>> if (con->id && !fwnode_property_present(con->fwnode, con->id)) >>>>>> return NULL; >>>>>> >>>>>> dev = class_find_device(&typec_mux_class, NULL, con->fwnode, >>>>>> fwnode_match); >>>>>> } else { >>>>>> dev = class_find_device(&typec_mux_class, NULL, >>>>>> con->endpoint[ep], name_match); >>>>>> } >>>>>> >>>>>> return dev ? to_typec_switch(dev) : ERR_PTR(-EPROBE_DEFER); >>>>>> } >>>>>> >>>>>> Simply returns the first typec_mux_class device registered. >>>>>> >>>>>> I see 2 possible solutions to this problem: >>>>>> >>>>>> 1) Use separate typec_mux_class and typec_orientation_switch_class-es >>>>>> >>>>>> 2) Merge struct typec_switch and struct typec_mux into a single struct, >>>>>> so that all typec_mux_class devices have the same memory layout, add >>>>>> a subclass enum to this new merged struct and use that to identify >>>>>> which of the typec_mux_class devices with the same fwnode pointer we >>>>>> want. >>>>>> >>>>>> Any other suggestions? >>>>> >>>>> I think the correct fix is that we supply separate nodes for both >>>>> device entries. >>>> >>>> That is not going to work since the (virtual) mux / orientation-switch >>>> devices are only registered once the driver binds to the piusb30532 i2c >>>> device, so when creating the nodes we only have the piusb30532 i2c device. >>> >>> It's not a problem, that's why we have the software nodes. The nodes >>> can be created before the device entires. The node for pi3usb30532 >>> will just be the parent node for the new nodes we add for the mux and >>> switch. >>> >>>> I've been thinking some more about this and an easy fix is to have separate >>>> fwnode_match functions for typec_switch_match and typec_mux_match and have >>>> them check that the dev_name ends in "-mux" resp. "-switch" that requires >>>> only a very minimal change to "usb: typec: Registering real device entries for the muxes" >>>> and then everything should be fine. >>> >>> I don't want to do anymore device name matching unless we have to, and >>> here we don't have to. We can name the nodes for those virtual mux and >>> switch, and then just do fwnode_find_named_child_node() in >>> pi3usb30532.c for both of them. >> >> Ok. >> >>>> 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'll wait for you results on that. >> >> I understand that you want to wait with doing a v4 until this is resolved, >> but can you (privately) send me a v3.5 fixing the mux/switch issue so that >> I can test that (and get the problem out of the way for debugging the other >> stuff) ? >> >> I've also just replied to the following patch with a review remark: >> [PATCH v3 11/13] platform/x86: intel_cht_int33fe: Provide fwnode for the USB connector >> >> Since you need to respin the series anyways, it would be good if you can >> address that too. > > Sure thing. I don't have time today to prepare the patches for you to > test today, nor tomorrow depending I'm a travelling or not, so this may > have wait for next week (Friday's off) :-( Note I'm on vacation myself next week, Monday I'm still reading email and I can run some tests, next week Tuesday - Friday I'm off. Regards, Hans