linux-kernel - Re: [PATCH 1/2] staging: typec: tcpm: Validate source and sink caps

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Date:   Sat, 9 Sep 2017 07:03:10 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Badhri Jagan Sridharan <badhri@...gle.com>,
        devel@...verdev.osuosl.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] staging: typec: tcpm: Validate source and sink caps

On Fri, Sep 08, 2017 at 09:13:25PM +0200, Greg Kroah-Hartman wrote:
> On Fri, Sep 08, 2017 at 10:29:52AM -0700, Badhri Jagan Sridharan wrote:
> > On Fri, Sep 8, 2017 at 2:45 AM, Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > > On Thu, Sep 07, 2017 at 06:22:13PM -0700, Badhri Jagan Sridharan wrote:
> > >> The source and sink caps should follow the following rules.
> > >> This patch validates whether the src_caps/snk_caps adheres
> > >> to it.
> > >>
> > >> 6.4.1 Capabilities Message
> > >> A Capabilities message (Source Capabilities message or Sink
> > >> Capabilities message) shall have at least one Power
> > >> Data Object for vSafe5V. The Capabilities message shall also
> > >> contain the sending Port’s information followed by up to
> > >> 6 additional Power Data Objects. Power Data Objects in a
> > >> Capabilities message shall be sent in the following order:
> > >>
> > >> 1. The vSafe5V Fixed Supply Object shall always be the first object.
> > >> 2. The remaining Fixed Supply Objects, if present, shall be sent
> > >>    in voltage order; lowest to highest.
> > >> 3. The Battery Supply Objects, if present shall be sent in Minimum
> > >>    Voltage order; lowest to highest.
> > >> 4. The Variable Supply (non-battery) Objects, if present, shall be
> > >>    sent in Minimum Voltage order; lowest to highest.
> > >>
> > >> Errors in source/sink_caps of the local port will prevent
> > >> the port registration. Whereas, errors in source caps of partner
> > >> device would only log them.
> > >>
> > >> Signed-off-by: Badhri Jagan Sridharan <Badhri@...gle.com>
> > >> ---
> > >>  drivers/staging/typec/pd.h   |   2 +
> > >>  drivers/staging/typec/tcpm.c | 107 +++++++++++++++++++++++++++++++++++++++----
> > >>  drivers/staging/typec/tcpm.h |  16 +++----
> > >>  3 files changed, 108 insertions(+), 17 deletions(-)
> > >
> > > Before you add more stuff to this driver, what is needed to get it out
> > > of staging?  That would be more useful to do now, right?
> > 
> > Actually not adding more features here. There was a bug where
> > the phone wasnt charging at the highest possible power output,
> > came up with the these patches while debugging that issue.
> 
> Ok, but again, when is this going to get out of staging?

Code wise nothing. Add documentation to data structures, eliminate dead code,
drop and left over FIXME / TODO (those are not substantial enough to retain).

Guenter