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Message-ID: <CAMty3ZC=cLNbJAeDBGCyYrknB5LWriL-pisk7j=jXQ54bse7XQ@mail.gmail.com>
Date: Wed, 22 May 2019 17:31:10 +0530
From: Jagan Teki <jagan@...rulasolutions.com>
To: Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
Maxime Ripard <maxime.ripard@...tlin.com>
Cc: Andrzej Hajda <a.hajda@...sung.com>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Chen-Yu Tsai <wens@...e.org>, David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Michael Trimarchi <michael@...rulasolutions.com>,
dri-devel <dri-devel@...ts.freedesktop.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-sunxi <linux-sunxi@...glegroups.com>,
linux-amarula <linux-amarula@...rulasolutions.com>
Subject: Re: [linux-sunxi] [PATCH 3/6] drm/sun4i: dsi: Add bridge support
Hi Paul and Maxime,
On Fri, Mar 15, 2019 at 7:03 PM Paul Kocialkowski
<paul.kocialkowski@...tlin.com> wrote:
>
> Hi,
>
> On Fri, 2019-03-15 at 18:38 +0530, Jagan Teki wrote:
> > Some display panels would come up with a non-DSI output which
> > can have an option to connect DSI interface by means of bridge
> > convertor.
> >
> > This DSI to non-DSI bridge convertor would require a bridge
> > driver that would communicate the DSI controller for bridge
> > functionalities.
> >
> > So, add support for bridge functionalities in Allwinner DSI
> > controller.
>
> See a few comments below.
>
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 65 +++++++++++++++++++-------
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 1 +
> > 2 files changed, 49 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index 0960b96b62cc..64d74313b842 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -781,6 +781,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> > if (!IS_ERR(dsi->panel))
> > drm_panel_prepare(dsi->panel);
> >
> > + if (!IS_ERR(dsi->bridge))
> > + drm_bridge_pre_enable(dsi->bridge);
> > +
> > /*
> > * FIXME: This should be moved after the switch to HS mode.
> > *
> > @@ -796,6 +799,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> > if (!IS_ERR(dsi->panel))
> > drm_panel_enable(dsi->panel);
> >
> > + if (!IS_ERR(dsi->bridge))
> > + drm_bridge_enable(dsi->bridge);
> > +
> > sun6i_dsi_start(dsi, DSI_START_HSC);
> >
> > udelay(1000);
> > @@ -812,6 +818,9 @@ static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
> > if (!IS_ERR(dsi->panel)) {
> > drm_panel_disable(dsi->panel);
> > drm_panel_unprepare(dsi->panel);
> > + } else if (!IS_ERR(dsi->bridge)) {
> > + drm_bridge_disable(dsi->bridge);
> > + drm_bridge_post_disable(dsi->bridge);
> > }
> >
> > phy_power_off(dsi->dphy);
> > @@ -973,11 +982,16 @@ static int sun6i_dsi_attach(struct mipi_dsi_host *host,
> > struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
> >
> > dsi->device = device;
> > - dsi->panel = of_drm_find_panel(device->dev.of_node);
> > - if (IS_ERR(dsi->panel))
> > - return PTR_ERR(dsi->panel);
> >
> > - dev_info(host->dev, "Attached device %s\n", device->name);
> > + dsi->bridge = of_drm_find_bridge(device->dev.of_node);
> > + if (!dsi->bridge) {
>
> You are using IS_ERR to check that the bridge is alive in the changes
> above, but switch to checking that it's non-NULL at this point.
>
> Are both guaranteed to be interchangeable?
>
> > + dsi->panel = of_drm_find_panel(device->dev.of_node);
> > + if (IS_ERR(dsi->panel))
> > + return PTR_ERR(dsi->panel);
> > + }
>
> You should probably use drm_of_find_panel_or_bridge instead of
> duplicating the logic here.
True, In-fact I did try this API. but pipeline were unable to bound.
Usually the panel and bridge were attached first and then the pipeline
bound would start from front-end (in A33) But in my below cases I have
seen only panel or bridge attached but no pipeline bound at all.
And I'm using drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0,
&dsi->panel, &dsi->bridge); in dsi attach API.
Case-1, panel:
&dsi {
vcc-dsi-supply = <®_dcdc1>; /* VCC3V3-DSI */
status = "okay";
ports {
dsi_out: port@1 {
reg = <1>;
dsi_out_panel: endpoint {
remote-endpoint = <&panel_out_dsi>;
};
};
};
panel@0 {
compatible = "bananapi,s070wv20-ct16-icn6211";
reg = <0>;
enable-gpios = <&pio 1 7 GPIO_ACTIVE_HIGH>; /* LCD-PWR-EN: PB7 */
reset-gpios = <&r_pio 0 5 GPIO_ACTIVE_HIGH>; /* LCD-RST: PL5 */
backlight = <&backlight>;
port {
panel_out_dsi: endpoint {
remote-endpoint = <&dsi_out_panel>;
};
};
};
};
Case-2, bridge:
panel {
compatible = "bananapi,s070wv20-ct16", "simple-panel";
enable-gpios = <&pio 1 7 GPIO_ACTIVE_HIGH>; /* LCD-PWR-EN: PB7 */
backlight = <&backlight>;
port {
panel_out_bridge: endpoint {
remote-endpoint = <&bridge_out_panel>;
};
};
};
&dsi {
vcc-dsi-supply = <®_dcdc1>; /* VCC-DSI */
status = "okay";
ports {
dsi_out: port@1 {
reg = <1>;
dsi_out_bridge: endpoint {
remote-endpoint = <&bridge_out_dsi>;
};
};
};
bridge@0 {
reg = <0>;
compatible = "bananapi,icn6211", "chipone,icn6211";
reset-gpios = <&r_pio 0 5 GPIO_ACTIVE_HIGH>; /* LCD-RST: PL5 */
#address-cells = <1>;
#size-cells = <0>;
ports {
#address-cells = <1>;
#size-cells = <0>;
bridge_in: port@0 {
reg = <0>;
bridge_out_dsi: endpoint {
remote-endpoint = <&dsi_out_bridge>;
};
};
bridge_out: port@1 {
reg = <1>;
bridge_out_panel: endpoint {
remote-endpoint = <&panel_out_bridge>;
};
};
};
};
};
I think, I'm sure about the pipeline connections as per my
understanding. but something loosely missed here or in the code.
Please do let me know for any suggestions.
Jagan.
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