linux-kernel - Re: [PATCH v4 0/7] usb: typec: ucsi: rework glue driver interface

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Date: Thu, 27 Jun 2024 17:02:43 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Nikita Travkin <nikita@...n.ru>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 0/7] usb: typec: ucsi: rework glue driver interface

On Thu, Jun 27, 2024 at 05:57:30PM +0300, Dmitry Baryshkov wrote:
> On Thu, 27 Jun 2024 at 17:54, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Thu, Jun 27, 2024 at 05:44:39PM +0300, Dmitry Baryshkov wrote:
> > > The interface between UCSI and the glue driver is very low-level. It
> > > allows reading the UCSI data from any offset (but in reality the UCSI
> > > driver reads only VERSION, CCI an MESSAGE_IN data). All event handling
> > > is to be done by the glue driver (which already resulted in several
> > > similar-but-slightly different implementations). It leaves no place to
> > > optimize the write-read-read sequence for the command execution (which
> > > might be beneficial for some of the drivers), etc.
> > >
> > > The patchseries attempts to restructure the UCSI glue driver interface
> > > in order to provide sensible operations instead of a low-level read /
> > > write calls.
> > >
> > > If this approach is found to be acceptable, I plan to further rework the
> > > command interface, moving reading CCI and MESSAGE_IN to the common
> > > control code, which should simplify driver's implementation and remove
> > > necessity to split quirks between sync_control and read_message_in e.g.
> > > as implemented in the ucsi_ccg.c.
> > >
> > > Note, the series was tested only on the ucsi_glink platforms. Further
> > > testing is appreciated.
> > >
> > > Depends: [1], [2]
> > >
> > > [1] https://lore.kernel.org/linux-usb/20240612124656.2305603-1-fabrice.gasnier@foss.st.com/
> > >
> > > [2] https://lore.kernel.org/linux-usb/20240621-ucsi-yoga-ec-driver-v8-1-e03f3536b8c6@linaro.org/
> > >
> > > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > > ---
> > > Changes in v4:
> > > - Rebased on top of Greg's tree to resolve conflicts.
> >
> > Nope, still got conflicts, are you sure you updated properly?  Patch 1
> > applied, but #2 did not.
> 
> I feel stupid enough now. I rebased on top of usb-next instead of
> usb-testing. Let me spam it once again

Both branches should be identical right now, perhaps you missed when I
synced them up.