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

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Date: Sun, 28 Jan 2024 10:06:18 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>, linux-usb@...r.kernel.org
Cc: 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 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?

> 
> 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(-)
>