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Date: Wed, 11 Jan 2023 11:31:12 +0800
From: Pin-yen Lin <treapking@...omium.org>
To: Chen-Yu Tsai <wenst@...omium.org>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <robert.foss@...aro.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Daniel Scally <djrscally@...il.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Prashant Malani <pmalani@...omium.org>,
Benson Leung <bleung@...omium.org>,
Guenter Roeck <groeck@...omium.org>,
Marek Vasut <marex@...x.de>, devicetree@...r.kernel.org,
Nícolas F . R . A . Prado
<nfraprado@...labora.com>, linux-acpi@...r.kernel.org,
Allen Chen <allen.chen@....com.tw>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
Javier Martinez Canillas <javierm@...hat.com>,
dri-devel@...ts.freedesktop.org,
Stephen Boyd <swboyd@...omium.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Hsin-Yi Wang <hsinyi@...omium.org>,
chrome-platform@...ts.linux.dev, Xin Ji <xji@...logixsemi.com>,
linux-kernel@...r.kernel.org,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v9 6/9] drm/bridge: anx7625: Register Type C mode switches
Hi Chen-Yu,
Thanks for the review.
On Mon, Jan 9, 2023 at 7:26 PM Chen-Yu Tsai <wenst@...omium.org> wrote:
>
> On Mon, Jan 9, 2023 at 4:41 PM Pin-yen Lin <treapking@...omium.org> wrote:
> >
> > Register USB Type-C mode switches when the "mode-switch" property and
> > relevant port are available in Device Tree. Configure the crosspoint
> ^ ports
>
Thanks for catching this. I'll fix in v10.
> > switch based on the entered alternate mode for a specific Type-C
> > connector.
>
> You should also mention that the "one mode switch" scenario is not
> covered in this implementation, due to lack of actual hardware.
If I understand correctly, we should use "orientation-switch"[1]
instead when the crosspoint switch on anx7625 is used to support
different orientations of the Type-C connector.
I'll add some explanations around this in the commit message in v10.
[1]: https://docs.kernel.org/driver-api/usb/typec.html#multiplexer-demultiplexer-switches
>
> > Signed-off-by: Pin-yen Lin <treapking@...omium.org>
> >
> > ---
> >
> > (no changes since v7)
> >
> > Changes in v7:
> > - Fixed style issues in anx7625 driver
> > - Removed DT property validation in anx7625 driver.
> > - Extracted common codes to another commit.
> >
> > Changes in v6:
> > - Squashed to a single patch
> >
> > drivers/gpu/drm/bridge/analogix/Kconfig | 1 +
> > drivers/gpu/drm/bridge/analogix/anx7625.c | 88 +++++++++++++++++++++++
> > drivers/gpu/drm/bridge/analogix/anx7625.h | 13 ++++
> > 3 files changed, 102 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig
> > index 173dada218ec..992b43ed1dd7 100644
> > --- a/drivers/gpu/drm/bridge/analogix/Kconfig
> > +++ b/drivers/gpu/drm/bridge/analogix/Kconfig
> > @@ -34,6 +34,7 @@ config DRM_ANALOGIX_ANX7625
> > tristate "Analogix Anx7625 MIPI to DP interface support"
> > depends on DRM
> > depends on OF
> > + depends on TYPEC || TYPEC=n
> > select DRM_DISPLAY_DP_HELPER
> > select DRM_DISPLAY_HDCP_HELPER
> > select DRM_DISPLAY_HELPER
> > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > index 1cf242130b91..2bb504a8d789 100644
> > --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > @@ -15,6 +15,8 @@
> > #include <linux/regulator/consumer.h>
> > #include <linux/slab.h>
> > #include <linux/types.h>
> > +#include <linux/usb/typec_dp.h>
> > +#include <linux/usb/typec_mux.h>
> > #include <linux/workqueue.h>
> >
> > #include <linux/of_gpio.h>
> > @@ -2572,6 +2574,86 @@ static void anx7625_runtime_disable(void *data)
> > pm_runtime_disable(data);
> > }
> >
> > +static void anx7625_set_crosspoint_switch(struct anx7625_data *ctx,
> > + enum typec_orientation orientation)
> > +{
> > + if (orientation == TYPEC_ORIENTATION_NORMAL) {
> > + anx7625_reg_write(ctx, ctx->i2c.tcpc_client, TCPC_SWITCH_0,
> > + SW_SEL1_SSRX_RX1 | SW_SEL1_DPTX0_RX2);
> > + anx7625_reg_write(ctx, ctx->i2c.tcpc_client, TCPC_SWITCH_1,
> > + SW_SEL2_SSTX_TX1 | SW_SEL2_DPTX1_TX2);
> > + } else if (orientation == TYPEC_ORIENTATION_REVERSE) {
> > + anx7625_reg_write(ctx, ctx->i2c.tcpc_client, TCPC_SWITCH_0,
> > + SW_SEL1_SSRX_RX2 | SW_SEL1_DPTX0_RX1);
> > + anx7625_reg_write(ctx, ctx->i2c.tcpc_client, TCPC_SWITCH_1,
> > + SW_SEL2_SSTX_TX2 | SW_SEL2_DPTX1_TX1);
> > + }
> > +}
> > +
> > +static void anx7625_typec_two_ports_update(struct anx7625_data *ctx)
> > +{
> > + struct drm_dp_typec_switch_desc switch_desc = ctx->switch_desc;
> > + /* Check if both ports available and do nothing to retain the current one */
> > + if (switch_desc.typec_ports[0].dp_connected && switch_desc.typec_ports[1].dp_connected)
> > + return;
> > +
> > + if (switch_desc.typec_ports[0].dp_connected)
> > + anx7625_set_crosspoint_switch(ctx, TYPEC_ORIENTATION_NORMAL);
> > + else if (switch_desc.typec_ports[1].dp_connected)
> > + anx7625_set_crosspoint_switch(ctx, TYPEC_ORIENTATION_REVERSE);
> > +}
> > +
> > +static int anx7625_typec_mux_set(struct typec_mux_dev *mux,
> > + struct typec_mux_state *state)
> > +{
> > + struct drm_dp_typec_port_data *port_data = typec_mux_get_drvdata(mux);
> > + struct anx7625_data *ctx = (struct anx7625_data *) port_data->data;
> > + struct device *dev = &ctx->client->dev;
> > + struct drm_dp_typec_switch_desc switch_desc = ctx->switch_desc;
> > + bool new_dp_connected, old_dp_connected;
> > +
>
> And place a TODO note here.
I'll add it in v10.
>
> Otherwise this looks OK.
>
> Also,
>
> Tested-by: Chen-Yu Tsai <wenst@...omium.org>
> on MT8192 based Hayato (ASUS Chromebook Flip CM3200).
>
> And this also uncovered a deadlock in the unplug & disable path.
> I'll send a fix for that later once I figure out all the details.
Thank you so much for this!
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