From: "Patel, Utkarsh H" <utkarsh.h.patel@intel.com>
To: Prashant Malani <pmalani@chromium.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"heikki.krogerus@linux.intel.com"
<heikki.krogerus@linux.intel.com>,
"enric.balletbo@collabora.com" <enric.balletbo@collabora.com>,
"Mani, Rajmohan" <rajmohan.mani@intel.com>,
"Shaikh, Azhar" <azhar.shaikh@intel.com>
Subject: RE: [PATCH v3 2/4] platform/chrome: cros_ec_typec: Use Thunderbolt 3 cable discover mode VDO in USB4 mode
Date: Fri, 20 Nov 2020 02:32:24 +0000 [thread overview]
Message-ID: <MWHPR11MB004898556A4CF622742D3EAAA9FF0@MWHPR11MB0048.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20201119080906.GE3652649@google.com>
Hi Prashant,
> -----Original Message-----
> From: Prashant Malani <pmalani@chromium.org>
> Sent: Thursday, November 19, 2020 12:09 AM
> To: Patel, Utkarsh H <utkarsh.h.patel@intel.com>
> Cc: linux-kernel@vger.kernel.org; linux-usb@vger.kernel.org;
> heikki.krogerus@linux.intel.com; enric.balletbo@collabora.com; Mani,
> Rajmohan <rajmohan.mani@intel.com>; Shaikh, Azhar
> <azhar.shaikh@intel.com>
> Subject: Re: [PATCH v3 2/4] platform/chrome: cros_ec_typec: Use Thunderbolt
> 3 cable discover mode VDO in USB4 mode
>
> Hi Utkarsh,
>
> On Wed, Nov 18, 2020 at 10:32:09PM -0800, Utkarsh Patel wrote:
> > Configure Thunderbolt 3 cable generation value by filling Thunderbolt
> > 3 cable discover mode VDO to support rounded Thunderbolt 3 cables.
> > While we are here use Thunderbolt 3 cable discover mode VDO to fill
> > active cable plug link training value.
> >
> > Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> > Signed-off-by: Utkarsh Patel <utkarsh.h.patel@intel.com>
> >
> > --
> > Changes in v3:
> > - Added a check for cable's TBT support before filling TBT3 discover mode
> > VDO.
> >
> > Changes in v2:
> > - No change.
> > --
> > ---
> > drivers/platform/chrome/cros_ec_typec.c | 14 ++++++++++++--
> > 1 file changed, 12 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/platform/chrome/cros_ec_typec.c
> > b/drivers/platform/chrome/cros_ec_typec.c
> > index 8111ed1fc574..68b17ee1d1ae 100644
> > --- a/drivers/platform/chrome/cros_ec_typec.c
> > +++ b/drivers/platform/chrome/cros_ec_typec.c
> > @@ -514,8 +514,18 @@ static int cros_typec_enable_usb4(struct
> cros_typec_data *typec,
> > else if (pd_ctrl->control_flags & USB_PD_CTRL_ACTIVE_CABLE)
> > data.eudo |= EUDO_CABLE_TYPE_RE_TIMER <<
> EUDO_CABLE_TYPE_SHIFT;
> >
> > - data.active_link_training = !!(pd_ctrl->control_flags &
> > - USB_PD_CTRL_ACTIVE_LINK_UNIDIR);
> > + /*
> > + * Filling TBT3 Cable VDO when TBT3 cable is being used to establish
> > + * USB4 connection.
> > + */
> > + if (pd_ctrl->cable_gen) {
> > + data.tbt_cable_vdo = TBT_MODE;
> > +
> > + if (pd_ctrl->control_flags &
> USB_PD_CTRL_ACTIVE_LINK_UNIDIR)
> > + data.tbt_cable_vdo |= TBT_CABLE_LINK_TRAINING;
> > +
> > + data.tbt_cable_vdo |= TBT_SET_CABLE_ROUNDED(pd_ctrl-
> >cable_gen);
> > + }
>
> I think the following would decouple Rounded Support and Active Cable Link
> Training?:
Any reason you would want to decouple them?
As for the TBT3 active cable to create USB4 connection, it needs have rounded data rates.
>
> struct typec_thunderbolt_data data = {}; ...
> if (pd_ctrl->control_flags & USB_PD_CTRL_ACTIVE_LINK_UNIDIR)
> data.tbt_cable_vdo |= TBT_CABLE_LINK_TRAINING;
>
> data.tbt_cable_vdo |= TBT_SET_CABLE_ROUNDED(pd_ctrl-
> >cable_gen);
>
> if (data.tbt_cable_vdo)
> data.tbt_cable_vdo |= TBT_MODE;
>
>
> Best regards,
>
> -Prashant
Sincerely,
Utkarsh Patel.
next prev parent reply other threads:[~2020-11-20 2:32 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-19 6:32 [PATCH v3 0/4] Thunderbolt3/USB4 cable rounded and active cable plug link training support Utkarsh Patel
2020-11-19 6:32 ` [PATCH v3 1/4] usb: typec: Use Thunderbolt 3 cable discover mode VDO in Enter_USB message Utkarsh Patel
2020-11-20 8:05 ` Heikki Krogerus
2020-11-20 8:36 ` Prashant Malani
2020-11-20 8:52 ` Heikki Krogerus
2020-11-20 17:04 ` Patel, Utkarsh H
2020-11-19 6:32 ` [PATCH v3 2/4] platform/chrome: cros_ec_typec: Use Thunderbolt 3 cable discover mode VDO in USB4 mode Utkarsh Patel
2020-11-19 8:09 ` Prashant Malani
2020-11-20 2:32 ` Patel, Utkarsh H [this message]
2020-11-20 3:13 ` Prashant Malani
2020-11-20 11:22 ` Heikki Krogerus
2020-11-20 12:07 ` Prashant Malani
2020-11-20 13:36 ` Prashant Malani
2020-11-20 13:41 ` Heikki Krogerus
2020-11-19 6:32 ` [PATCH v3 3/4] usb: typec: intel_pmc_mux: Configure active cable properties for USB4 Utkarsh Patel
2020-11-19 6:32 ` [PATCH v3 4/4] usb: typec: Remove active_link_training variable from Enter_USB message Utkarsh Patel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=MWHPR11MB004898556A4CF622742D3EAAA9FF0@MWHPR11MB0048.namprd11.prod.outlook.com \
--to=utkarsh.h.patel@intel.com \
--cc=azhar.shaikh@intel.com \
--cc=enric.balletbo@collabora.com \
--cc=heikki.krogerus@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=pmalani@chromium.org \
--cc=rajmohan.mani@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).