linux-kernel - Re: [PATCH v3 0/7] usb: typec: ucsi: rework glue driver interface

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Date: Wed, 26 Jun 2024 21:28:52 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	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 v3 0/7] usb: typec: ucsi: rework glue driver interface

On Wed, Jun 26, 2024 at 05:24:22PM GMT, Heikki Krogerus wrote:
> On Tue, Jun 25, 2024 at 05:54:25PM +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.
> 
> I tested these on couple of systems that use the acpi mailbox, and
> didn't see any problems. I'll be away for most of July, so if there's
> nothing else, for the series:
> 
> Tested-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> 

Thanks!

-- 
With best wishes
Dmitry