[PATCH v2 0/6] Fixes to Tegra USB role switching and phy handling

[Diogo Ivo]

Hello,

Ping on this series as it has been quite a while since this was sent out
originally.

Best regards,

Diogo

On 1/27/26 15:11, Diogo Ivo wrote:
> Hello,
> 
> This patch series contains fixes/improvements for USB role switching on the
> Tegra210 and Tegra186 SoCs.
> 
> The first patch addresses a wrong check on the logic that disables the
> VBUS regulator.
> 
> The second patch removes a redundant mutex lock when setting the PHY
> mode.
> 
> The third patch guarantees proper ordering of events when switching PHY
> roles.
> 
> The remaining patches are included to standardize the PHY .set_mode()
> callback between Tegra186 and Tegra210.
> 
> With this patch series this feature can only be controlled from userspace,
> by writing the desired role to sysfs as
> 
> echo "role" > /sys/class/usb_role/usb2-0-role-switch/role
> 
> with role being one of {device, host, none}.
> 
> Further patches will enable automatic role switching via the 'cros_ec_typec'
> driver which is currently broken on Smaug.
> 
> Signed-off-by: Diogo Ivo <diogo.ivo at tecnico.ulisboa.pt>
> ---
> Changes in v2:
> - Remove DT patches already taken to be upstreamed
> - Add standardization between Tegra210 and Tegra186
> - Address review comments from v1, detailed descriptions in each patch
> - Link to v1: https://lore.kernel.org/r/20251204-diogo-tegra_phy-v1-0-51a2016d0be8@tecnico.ulisboa.pt
> 
> ---
> Diogo Ivo (6):
>        phy: tegra: xusb: Fix USB2 port regulator disable logic
>        usb: xhci: tegra: Remove redundant mutex when setting phy mode
>        phy: tegra: xusb: Fix ordering issue when switching roles on USB2 ports
>        phy: tegra: xusb: Add ID override support to padctl
>        phy: tegra: xusb: Move .set_mode() to a shared location
>        phy: tegra: xusb: Move T186 .set_mode() to common implementation
> 
>   drivers/phy/tegra/xusb-tegra186.c   | 73 +++++----------------------------
>   drivers/phy/tegra/xusb-tegra210.c   | 42 +------------------
>   drivers/phy/tegra/xusb.c            | 80 +++++++++++++++++++++++++++++++++++++
>   drivers/phy/tegra/xusb.h            |  4 ++
>   drivers/usb/gadget/udc/tegra-xudc.c |  4 ++
>   drivers/usb/host/xhci-tegra.c       | 14 ++++---
>   include/linux/phy/tegra/xusb.h      |  3 ++
>   7 files changed, 111 insertions(+), 109 deletions(-)
> ---
> base-commit: b02a5530af8abe0d3cd4852ba48990716e962934
> change-id: 20251201-diogo-tegra_phy-86c89cab7377
> 
> Best regards,