From: Prashant Malani <pmalani@chromium.org>
To: Stephen Boyd <swboyd@chromium.org>
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
bleung@chromium.org, heikki.krogerus@linux.intel.com,
"Pin-Yen Lin" <treapking@chromium.org>,
"AngeloGioacchino Del Regno"
<angelogioacchino.delregno@collabora.com>,
"Nícolas F . R . A . Prado" <nfraprado@collabora.com>,
"Allen Chen" <allen.chen@ite.com.tw>,
"Andrzej Hajda" <andrzej.hajda@intel.com>,
"Daniel Vetter" <daniel@ffwll.ch>,
"David Airlie" <airlied@linux.ie>,
devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Hsin-Yi Wang" <hsinyi@chromium.org>,
"Jernej Skrabec" <jernej.skrabec@gmail.com>,
"Jonas Karlman" <jonas@kwiboo.se>,
"José Expósito" <jose.exposito89@gmail.com>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Laurent Pinchart" <Laurent.pinchart@ideasonboard.com>,
"Maxime Ripard" <maxime@cerno.tech>,
"Neil Armstrong" <narmstrong@baylibre.com>,
"Robert Foss" <robert.foss@linaro.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Sam Ravnborg" <sam@ravnborg.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Xin Ji" <xji@analogixsemi.com>
Subject: Re: [PATCH v5 5/9] drm/bridge: anx7625: Add typec_mux_set callback function
Date: Wed, 6 Jul 2022 11:26:19 -0700 [thread overview]
Message-ID: <CACeCKafya_XA+C3eJUvT4vjQSgsjdewVkCb+Jr2tA1605jjfjg@mail.gmail.com> (raw)
In-Reply-To: <CACeCKafQT_RBrkHJNE2ezahSsHLPrbnS69QbfnjxBoUhi6hjwQ@mail.gmail.com>
On Thu, Jun 30, 2022 at 4:38 PM Prashant Malani <pmalani@chromium.org> wrote:
>
> On Thu, Jun 30, 2022 at 4:21 PM Stephen Boyd <swboyd@chromium.org> wrote:
> >
> > Quoting Prashant Malani (2022-06-28 13:56:22)
> > > On Tue, Jun 28, 2022 at 1:40 PM Stephen Boyd <swboyd@chromium.org> wrote:
> > > >
> > > > I suppose none of those things matter though as long as there is some
> > > > typec switch registered here so that the driver can be informed of the
> > > > pin assignment. Is it right that the "mode-switch" property is only
> > > > required in DT if this device is going to control the mode of the
> > > > connector, i.e. USB+DP, or just DP? Where this device can't do that
> > > > because it doesn't support only DP.
> > >
> > > If the anx7625 is used just to route all lanes from 1 usb-c-connector (i.e
> > > the USB+DP case), a mode-switch wouldn't be of much use, since one
> > > would also route the CC lines to the built-in PD controller; so it will
> > > already have knowledge of what mode the switch is in.
> > >
> > > The mode-switch is likely only relevant for this hardware configuration(
> > > it's "DP only" in the sense that the USB pins to the SoC never go anywhere).
> > > One only has 2 SS lanes each (from each usb-c-connector).
> > >
> > > Since there is no CC-line, the anx7625 needs to know which one has DP
> > > enabled on it.
> >
> > Can the CC line be "captured" and not actually sent to the anx7625?
>
> That's what happens on Chrome OS. The cc line goes to the EC (and is "consumed"
> by the TCPM (Type C Port Manager)) and signals are then sent to the AP
> over the Host command interface to `cros-ec-typec`. The signals here being all
> the PD messages communicated between the peripheral and the port.
>
> > I imagine if that is possible, maybe the CC lines would go to some
> > micro-controller or something that did more typec management things and
> > then the anx7625 driver would need to do software control of the mode
> > and orientation control.
>
> I _guess_ that is possible (though it would seem odd to not use all the PD
> control hardware in that configuration)? If an system implements it in
> such a way
> then:
> 1. mode-switch: Can be updated to do something when num_typec_switches == 1 (
> in the mux_set function imp.l I haven't looked into what registers
> need to be configured, since we
> don't have this hardware implementation.
> 2. orientation-switch: This should be registered, and then flip the
> lanes when the port
> driver tells it the orientation is one way or another.
>
> So, if someone uses it that way, I think the driver needs only minor
> updates to support it.
Stephen, any pending concerns?
If not,I will post a v6 series with the suggested changes:
- Drop typec-switch binding; instead add a new top-level port with
end-points for each Type-C connector's switch.
- Drop it6505 patches.
- Squash anx7625 driver patches into one patch.
- Add a comment mentioning that we aren't registering the orientation-switch.
next prev parent reply other threads:[~2022-07-06 18:26 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-22 17:34 [PATCH v5 0/9] usb: typec: Introduce typec-switch binding Prashant Malani
2022-06-22 17:34 ` [PATCH v5 1/9] dt-bindings: usb: Add Type-C switch binding Prashant Malani
2022-06-23 18:30 ` Stephen Boyd
2022-06-23 19:08 ` Prashant Malani
2022-06-23 23:14 ` Stephen Boyd
2022-06-24 0:35 ` Prashant Malani
2022-06-24 1:24 ` Prashant Malani
2022-06-24 2:13 ` Stephen Boyd
2022-06-24 2:48 ` Prashant Malani
2022-06-24 19:50 ` Stephen Boyd
2022-06-24 21:41 ` Prashant Malani
2022-06-25 1:21 ` Stephen Boyd
2022-06-25 20:13 ` Krzysztof Kozlowski
2022-06-27 21:04 ` Rob Herring
2022-06-27 21:43 ` Prashant Malani
2022-06-28 18:23 ` Rob Herring
2022-06-29 14:33 ` Pin-yen Lin
2022-06-29 15:00 ` Pin-yen Lin
2022-06-29 17:58 ` Rob Herring
2022-06-29 21:58 ` Stephen Boyd
2022-06-29 22:55 ` Prashant Malani
2022-06-29 23:55 ` Stephen Boyd
2022-06-30 17:10 ` Prashant Malani
2022-07-12 17:45 ` Rob Herring
2022-07-13 21:58 ` Prashant Malani
2022-09-02 7:41 ` Prashant Malani
2022-09-16 18:21 ` Prashant Malani
2022-10-03 3:42 ` Pin-yen Lin
2022-06-22 17:34 ` [PATCH v5 2/9] dt-bindings: drm/bridge: anx7625: Add mode-switch support Prashant Malani
2022-06-22 17:34 ` [PATCH v5 3/9] drm/bridge: anx7625: Register number of Type C switches Prashant Malani
2022-06-22 17:34 ` [PATCH v5 4/9] drm/bridge: anx7625: Register Type-C mode switches Prashant Malani
2022-06-22 17:34 ` [PATCH v5 5/9] drm/bridge: anx7625: Add typec_mux_set callback function Prashant Malani
2022-06-28 19:25 ` Stephen Boyd
2022-06-28 19:48 ` Prashant Malani
2022-06-28 20:40 ` Stephen Boyd
2022-06-28 20:56 ` Prashant Malani
2022-06-30 23:21 ` Stephen Boyd
2022-06-30 23:38 ` Prashant Malani
2022-07-06 18:26 ` Prashant Malani [this message]
2022-07-07 0:17 ` Stephen Boyd
2022-07-12 10:22 ` Pin-yen Lin
2022-06-22 17:34 ` [PATCH v5 6/9] dt/bindings: drm/bridge: it6505: Add mode-switch support Prashant Malani
2022-06-23 18:24 ` Stephen Boyd
2022-06-23 18:37 ` Prashant Malani
2022-06-23 19:08 ` Stephen Boyd
2022-06-23 19:15 ` Prashant Malani
2022-06-22 17:34 ` [PATCH v5 7/9] drm/bridge: it6505: Register number of Type C switches Prashant Malani
2022-06-27 21:05 ` Rob Herring
2022-06-22 17:34 ` [PATCH v5 8/9] drm/bridge: it6505: Register Type-C mode switches Prashant Malani
2022-06-22 17:34 ` [PATCH v5 9/9] drm/bridge: it6505: Add typec_mux_set callback function Prashant Malani
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