linux-kernel - RE: [PATCH v2 4/5] platform/chrome: cros_ec_typec: Add Displayport Alternatemode 2.1 Support

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Date:   Thu, 31 Aug 2023 15:24:34 +0000
From:   "Patel, Utkarsh H" <utkarsh.h.patel@...el.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "pmalani@...omium.org" <pmalani@...omium.org>,
        "chrome-platform@...ts.linux.dev" <chrome-platform@...ts.linux.dev>
CC:     "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "bleung@...omium.org" <bleung@...omium.org>
Subject: RE: [PATCH v2 4/5] platform/chrome: cros_ec_typec: Add Displayport
 Alternatemode 2.1 Support

Hello,

>  drivers/platform/chrome/cros_ec_typec.c | 31
> +++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/drivers/platform/chrome/cros_ec_typec.c
> b/drivers/platform/chrome/cros_ec_typec.c
> index d0b4d3fc40ed..8372f13052a8 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -492,6 +492,8 @@ static int cros_typec_enable_dp(struct
> cros_typec_data *typec,  {
>  	struct cros_typec_port *port = typec->ports[port_num];
>  	struct typec_displayport_data dp_data;
> +	u32 cable_tbt_vdo;
> +	u32 cable_dp_vdo;
>  	int ret;
> 
>  	if (typec->pd_ctrl_ver < 2) {
> @@ -524,6 +526,35 @@ static int cros_typec_enable_dp(struct
> cros_typec_data *typec,
>  	port->state.data = &dp_data;
>  	port->state.mode = TYPEC_MODAL_STATE(ffs(pd_ctrl->dp_mode));
> 
> +	/* Get cable VDO for cables with DPSID to check DPAM2.1 is
> supported */
> +	cable_dp_vdo = cros_typec_get_cable_vdo(port,
> USB_TYPEC_DP_SID);
> +
> +	/**
> +	 * Get cable VDO for thunderbolt cables and cables with DPSID but
> does not
> +	 * support DPAM2.1.
> +	 */
> +	cable_tbt_vdo = cros_typec_get_cable_vdo(port,
> USB_TYPEC_TBT_SID);
> +
> +	if (cable_dp_vdo & DP_CAP_DPAM_VERSION) {
> +		dp_data.conf |= cable_dp_vdo;
> +	} else if (cable_tbt_vdo) {
> +		u8 cable_speed = TBT_CABLE_SPEED(cable_tbt_vdo);
> +
> +		dp_data.conf |= cable_speed <<
> DP_CONF_SIGNALLING_SHIFT;
> +
> +		/* Cable Type */
> +		if (cable_tbt_vdo & TBT_CABLE_OPTICAL)
> +			dp_data.conf |= DP_CONF_CABLE_TYPE_OPTICAL <<
> DP_CONF_CABLE_TYPE_SHIFT;
> +		else if (cable_tbt_vdo & TBT_CABLE_RETIMER)
> +			dp_data.conf |= DP_CONF_CABLE_TYPE_RE_TIMER <<
> DP_CONF_CABLE_TYPE_SHIFT;
> +		else if (cable_tbt_vdo & TBT_CABLE_ACTIVE_PASSIVE)
> +			dp_data.conf |= DP_CONF_CABLE_TYPE_RE_DRIVER
> << DP_CONF_CABLE_TYPE_SHIFT;
> +	} else if (PD_IDH_PTYPE(port->c_identity.id_header) ==
> IDH_PTYPE_PCABLE) {
> +		u8 cable_speed = VDO_CABLE_SPEED(port-
> >c_identity.vdo[0]);

I have wrong macro name here, will correct it in next version.
It should be VDO_TYPEC_CABLE_SPEED. 

Sincerely,
Utkarsh Patel.