linux-kernel - Re: [PATCH 2/3] usb: typec: ps883x: Rework ps883x

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Message-ID: <aPYFpzD6sklAvywa@kuha.fi.intel.com>
Date: Mon, 20 Oct 2025 12:49:27 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Konrad Dybcio <konradybcio@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
	Wesley Cheng <wesley.cheng@....qualcomm.com>,
	Jack Pham <jack.pham@....qualcomm.com>,
	Raghavendra Thoorpu <rthoorpu@....qualcomm.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH 2/3] usb: typec: ps883x: Rework ps883x_set()

On Tue, Oct 14, 2025 at 06:06:46PM +0200, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> In preparation to extend it with new alt/USB modes, rework the code a
> bit by changing the flow into a pair of switch statements.
> 
> Reviewed-by: Jack Pham <jack.pham@....qualcomm.com>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

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

> ---
>  drivers/usb/typec/mux/ps883x.c | 71 ++++++++++++++++++++++--------------------
>  1 file changed, 37 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/usb/typec/mux/ps883x.c b/drivers/usb/typec/mux/ps883x.c
> index 68f172df7be3..72f1e737ca4b 100644
> --- a/drivers/usb/typec/mux/ps883x.c
> +++ b/drivers/usb/typec/mux/ps883x.c
> @@ -99,44 +99,47 @@ static int ps883x_set(struct ps883x_retimer *retimer, struct typec_retimer_state
>  	int cfg1 = 0x00;
>  	int cfg2 = 0x00;
>  
> -	if (retimer->orientation == TYPEC_ORIENTATION_NONE ||
> -	    state->mode == TYPEC_STATE_SAFE) {
> -		return ps883x_configure(retimer, cfg0, cfg1, cfg2);
> -	}
> -
> -	if (state->alt && state->alt->svid != USB_TYPEC_DP_SID)
> -		return -EINVAL;
> -
>  	if (retimer->orientation == TYPEC_ORIENTATION_REVERSE)
>  		cfg0 |= CONN_STATUS_0_ORIENTATION_REVERSED;
>  
> -	switch (state->mode) {
> -	case TYPEC_STATE_USB:
> -		cfg0 |= CONN_STATUS_0_USB_3_1_CONNECTED;
> -		break;
> +	if (state->alt) {
> +		switch (state->alt->svid) {
> +		case USB_TYPEC_DP_SID:
> +			cfg1 |= CONN_STATUS_1_DP_CONNECTED |
> +				CONN_STATUS_1_DP_HPD_LEVEL;
>  
> -	case TYPEC_DP_STATE_C:
> -		cfg1 = CONN_STATUS_1_DP_CONNECTED |
> -		       CONN_STATUS_1_DP_SINK_REQUESTED |
> -		       CONN_STATUS_1_DP_PIN_ASSIGNMENT_C_D |
> -		       CONN_STATUS_1_DP_HPD_LEVEL;
> -		break;
> -
> -	case TYPEC_DP_STATE_D:
> -		cfg0 |= CONN_STATUS_0_USB_3_1_CONNECTED;
> -		cfg1 = CONN_STATUS_1_DP_CONNECTED |
> -		       CONN_STATUS_1_DP_SINK_REQUESTED |
> -		       CONN_STATUS_1_DP_PIN_ASSIGNMENT_C_D |
> -		       CONN_STATUS_1_DP_HPD_LEVEL;
> -		break;
> -
> -	case TYPEC_DP_STATE_E:
> -		cfg1 = CONN_STATUS_1_DP_CONNECTED |
> -		       CONN_STATUS_1_DP_HPD_LEVEL;
> -		break;
> -
> -	default:
> -		return -EOPNOTSUPP;
> +			switch (state->mode)  {
> +			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;
> +			}
> +			break;
> +		default:
> +			dev_err(&retimer->client->dev, "Got unsupported SID: 0x%x\n",
> +				state->alt->svid);
> +			return -EOPNOTSUPP;
> +		}
> +	} else {
> +		switch (state->mode) {
> +		case TYPEC_STATE_SAFE:
> +		/* USB2 pins don't even go through this chip */
> +		case TYPEC_MODE_USB2:
> +			break;
> +		case TYPEC_STATE_USB:
> +		case TYPEC_MODE_USB3:
> +			cfg0 |= CONN_STATUS_0_USB_3_1_CONNECTED;
> +			break;
> +		default:
> +			dev_err(&retimer->client->dev, "Got unsupported mode: %lu\n",
> +				state->mode);
> +			return -EOPNOTSUPP;
> +		}
>  	}
>  
>  	return ps883x_configure(retimer, cfg0, cfg1, cfg2);
> 
> -- 
> 2.51.0

-- 
heikki