linux-kernel - Re: [PATCH v4 5/5] usb: typec: intel_pmc_mux: Configure Displayport Alternate mode 2.1

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Message-ID: <086a35c5-6402-3e3e-1ac4-fade2797b63a@gmail.com>
Date:   Wed, 20 Sep 2023 12:10:21 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Utkarsh Patel <utkarsh.h.patel@...el.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     heikki.krogerus@...ux.intel.com, pmalani@...omium.org,
        chrome-platform@...ts.linux.dev, andriy.shevchenko@...ux.intel.com,
        bleung@...omium.org
Subject: Re: [PATCH v4 5/5] usb: typec: intel_pmc_mux: Configure Displayport
 Alternate mode 2.1

On 9/20/23 5:32 AM, Utkarsh Patel wrote:

> Mux agent driver can configure cable details such as cable type and
> cable speed received as a part of displayport configuration to support
> Displayport Alternate mode 2.1.
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Signed-off-by: Utkarsh Patel <utkarsh.h.patel@...el.com>
> ---
> Changes in v4:
> - No change.
> 
> Changes in v3:
> - No change.
> 
> Changes in v2:
> - No change.
> 
>  drivers/usb/typec/mux/intel_pmc_mux.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c
> index 60ed1f809130..233958084b43 100644
> --- a/drivers/usb/typec/mux/intel_pmc_mux.c
> +++ b/drivers/usb/typec/mux/intel_pmc_mux.c
[...]
> @@ -293,6 +299,24 @@ pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state)
>  	req.mode_data |= (state->mode - TYPEC_STATE_MODAL) <<
>  			 PMC_USB_ALTMODE_DP_MODE_SHIFT;
>  
> +	if (!is_pmc_mux_tbt(port->pmc->iom_adev)) {
> +		u8 cable_speed = (data->conf & DP_CONF_SIGNALLING_MASK) >>
> +				  DP_CONF_SIGNALLING_SHIFT;
> +
> +		u8 cable_type = (data->conf & DP_CONF_CABLE_TYPE_MASK) >>
> +				 DP_CONF_CABLE_TYPE_SHIFT;
> +
> +		req.mode_data |= PMC_USB_ALTMODE_CABLE_SPD(cable_speed);
> +
> +		if (cable_type == DP_CONF_CABLE_TYPE_OPTICAL)
> +			req.mode_data |= PMC_USB_ALTMODE_CABLE_TYPE;
> +		else if (cable_type == DP_CONF_CABLE_TYPE_RE_TIMER)
> +			req.mode_data |= PMC_USB_ALTMODE_ACTIVE_CABLE |
> +					 PMC_USB_ALTMODE_RETIMER_CABLE;
> +		else if (cable_type == DP_CONF_CABLE_TYPE_RE_DRIVER)
> +			req.mode_data |= PMC_USB_ALTMODE_ACTIVE_CABLE;

   Why not *switch* instead of string of *if*s?

> +	}
> +
>  	ret = pmc_usb_command(port, (void *)&req, sizeof(req));
>  	if (ret)
>  		return ret;

MBR, Sergey