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

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Date: Wed, 26 Jun 2024 17:24:22 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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 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,

-- 
heikki