linux-kernel - Re: [PATCH 08/32] usb: typec: tcpm: tcpm: Remove dangling unused 'struct tcpm_altmode

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Message-ID: <f2fdead0-9fac-dad3-5d76-41308d5c689d@redhat.com>
Date:   Thu, 9 Jul 2020 14:50:47 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     gregkh@...uxfoundation.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH 08/32] usb: typec: tcpm: tcpm: Remove dangling unused
 'struct tcpm_altmode_ops'

Hi,

On 7/6/20 4:20 PM, Lee Jones wrote:
> On Mon, 06 Jul 2020, Hans de Goede wrote:
> 
>> Hi,
>>
>> On 7/6/20 3:33 PM, Lee Jones wrote:
>>> Looks as though a079973f462a3 ("usb: typec: tcpm: Remove tcpc_config
>>> configuration mechanism") pulled out the only use of 'tcpm_altmode_ops'
>>> last year.  No need to keep it around.
>>>
>>> Fixes the following W=1 kernel build warning(s):
>>>
>>>    drivers/usb/typec/tcpm/tcpm.c:1551:39: warning: ‘tcpm_altmode_ops’ defined but not used [-Wunused-const-variable=]
>>>    1551 | static const struct typec_altmode_ops tcpm_altmode_ops = {
>>>    | ^~~~~~~~~~~~~~~~
>>>
>>> Cc: Guenter Roeck <linux@...ck-us.net>
>>> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>>> Cc: Hans de Goede <hdegoede@...hat.com>
>>> Signed-off-by: Lee Jones <lee.jones@...aro.org>
>>
>> This is necessary for adding Display port over Type-C support
>> on devices using the tcpm code, rather then firmware, to do
>> the Type-C alt-mode negotiation.
>>
>> I have a local patch in my tree which adds support for this.
>>
>> But Heikki did not like my approach, so that patch
>> (which needs the bits you are removing) never landed
>> upstream:
>>
>> https://patchwork.kernel.org/patch/11199517/
>>
>> Which is somewhat old now.
> 
> Yes, that's a just a little old now.
> 
> If it drags on for much longer, perhaps consider taking it out for the
> time being and adding it back when you start to make use of it again?
> 
>> Heikki said he would look into an approach to this more to
>> his liking. Heikki an progress on this area?

Just a little headsup that I'm making some time now to take a look
at solving this in the previously discussed better way, with the hope
of that we can get that upstream. So hopefully I will have some
patches for this ready during the upcoming weekend.

Regards,

Hans