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

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Date: Tue, 18 Jun 2024 21:59:07 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Maxime Coquelin <mcoquelin.stm32@...il.com>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc: 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 RFC 0/7] usb: typec: ucsi: rework glue driver interface

On Mon, Jun 03, 2024 at 02:24:53AM GMT, 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.

Gracious ping for the reviews / comments. My endgoal is to simplify the
command submission interface, allowing us to handle odd commands in a
single function rather than having the code split between sync_write()
and notification handling.

> 
> Depends: [1], [2]
> 
> [1] https://lore.kernel.org/linux-usb/20240521151109.3078775-1-fabrice.gasnier@foss.st.com/
> 
> [2] https://lore.kernel.org/linux-usb/20240531104653.1303519-1-heikki.krogerus@linux.intel.com/
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> Dmitry Baryshkov (7):
>       usb: typec: ucsi: move ucsi_acknowledge() from ucsi_read_error()
>       usb: typec: ucsi: simplify command sending API
>       usb: typec: ucsi: split read operation
>       usb: typec: ucsi: rework command execution functions
>       usb: typec: ucsi: inline ucsi_read_message_in
>       usb: typec: ucsi: extract common code for command handling
>       usb: typec: ucsi: reorder operations in ucsi_run_command()

-- 
With best wishes
Dmitry