Re: [PATCH] usb: typec: ps883x: Fix DP+USB3 configuration

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Mon, Jun 01, 2026 at 03:55:02PM +0200, Stephan Gerhold wrote:
> Commit 6bebd9b77726 ("usb: typec: ps883x: Rework ps883x_set()") introduced
> two regressions:
> 
>  1. The CONN_STATUS_0_USB_3_1_CONNECTED bit is mistakenly written to the
>     wrong configuration register (cfg1 instead of cfg0). This breaks USB3
>     when using USB3+DP adapters.
> 
>  2. The switch-case fallthrough block is inverted: Currently,
>     TYPEC_DP_STATE_C (DP-only) inherits the USB3 configuration, while
>     TYPEC_DP_STATE_D (DP+USB3) is missing the necessary DP sink flags.
> 
> Fix these by writing the USB3 bit to the correct register and swapping the
> case statement order so both states get their correct bits assigned.
> 
> Cc: stable@vger.kernel.org
> Fixes: 6bebd9b77726 ("usb: typec: ps883x: Rework ps883x_set()")
> Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
>  drivers/usb/typec/mux/ps883x.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/mux/ps883x.c b/drivers/usb/typec/mux/ps883x.c
> index 1256252eceed..c9bf4b4c2ba1 100644
> --- a/drivers/usb/typec/mux/ps883x.c
> +++ b/drivers/usb/typec/mux/ps883x.c
> @@ -118,12 +118,12 @@ static int ps883x_set(struct ps883x_retimer *retimer, struct typec_retimer_state
>  				CONN_STATUS_1_DP_HPD_LEVEL;
>  
>  			switch (state->mode)  {
> +			case TYPEC_DP_STATE_D:
> +				cfg0 |= CONN_STATUS_0_USB_3_1_CONNECTED;
> +				fallthrough;
>  			case TYPEC_DP_STATE_C:
>  				cfg1 |= CONN_STATUS_1_DP_SINK_REQUESTED |
>  					CONN_STATUS_1_DP_PIN_ASSIGNMENT_C_D;
> -				fallthrough;
> -			case TYPEC_DP_STATE_D:
> -				cfg1 |= CONN_STATUS_0_USB_3_1_CONNECTED;
>  				break;
>  			default: /* MODE_E */
>  				break;
> 
> ---
> base-commit: 645d4eda1d0db0202ed8e4a2c3abb2ebce6b86ef
> change-id: 20260601-ps883x-usb3dp-fixes-32c09e9bd6f6
> 
> Best regards,
> --  
> Stephan Gerhold <stephan.gerhold@linaro.org>

-- 
heikki