mbox series

[v3,0/3] usb: typec: ucsi: Adding support for UCSI 3.0

Message ID 20240126183930.1170845-1-abhishekpandit@chromium.org
Headers
Series usb: typec: ucsi: Adding support for UCSI 3.0 |

Message

Abhishek Pandit-Subedi Jan. 26, 2024, 6:39 p.m. UTC 
  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.

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(-)

Comments

Mario Limonciello Jan. 28, 2024, 4:06 p.m. UTC | #1 
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(-)
>
Abhishek Pandit-Subedi Jan. 30, 2024, 10:30 p.m. UTC | #2 
On Sun, Jan 28, 2024 at 8:06 AM Mario Limonciello
<mario.limonciello@amd.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(-)
> >
>