linux-kernel - Re: [PATCH v3 0/3] usb: typec: ucsi: Adding support for UCSI 3.0

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Date: Tue, 30 Jan 2024 14:30:47 -0800
From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, linux-usb@...r.kernel.org, 
	pmalani@...omium.org, jthies@...gle.com, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Bjorn Andersson <andersson@...nel.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Fabrice Gasnier <fabrice.gasnier@...s.st.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Hans de Goede <hdegoede@...hat.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Prashanth K <quic_prashk@...cinc.com>, 
	Rajaram Regupathy <rajaram.regupathy@...el.com>, Saranya Gopal <saranya.gopal@...el.com>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/3] usb: typec: ucsi: Adding support for UCSI 3.0

On Sun, Jan 28, 2024 at 8:06 AM Mario Limonciello
<mario.limonciello@....com> wrote:
>
> On 1/26/2024 12:39, Abhishek Pandit-Subedi wrote:
> >
> > Hi Heikki,
> >
> > This series starts the work adding UCSI 3.0 support to the UCSI driver.
> >
> > There's a couple of pieces to start here:
> > * Add version checks and limit read size on 1.2.
> > * Update Connector Status and Connector Capability structures.
> > * Expose Partner PD revision from Capability data.
> >
> > These were tested against on a 6.6 kernel running a usermode PPM against
> > a Realtek Evaluation board.
> >
> > One additional note: there are a lot more unaligned fields in UCSI now
> > and the struct definitions are getting a bit out of hand. We can discuss
> > alternate mechanisms for defining these structs in the patch that
> > changes these structures.
>
> On the Windows side I notice that Microsoft explicitly checks the UCSI
> version to decide what data structures to use.
>
> https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/ucsi#ucm-ucsi-acpi-device-for-ucsi-20-and-greater
>
> Perhaps doing something similar makes sense in Linux?

That probably belongs in `ucsi_acpi` and would be good to add there. I
don't have a Windows device reporting a UCSI version 2.0 but wanting
1.2 so I can't add or test this patch.

>
> >
> > Thanks,
> > Abhishek
> >
> > Changes in v3:
> >    - Change include to asm/unaligned.h and reorder include.
> >
> > Changes in v2:
> >    - Changed log message to DEBUG
> >    - Formatting changes and update macro to use brackets.
> >    - Fix incorrect guard condition when checking connector capability.
> >
> > Abhishek Pandit-Subedi (3):
> >    usb: typec: ucsi: Limit read size on v1.2
> >    usb: typec: ucsi: Update connector cap and status
> >    usb: typec: ucsi: Get PD revision for partner
> >
> >   drivers/usb/typec/ucsi/ucsi.c | 49 +++++++++++++++++++++++++--
> >   drivers/usb/typec/ucsi/ucsi.h | 64 ++++++++++++++++++++++++++++++++---
> >   2 files changed, 107 insertions(+), 6 deletions(-)
> >
>