linux-kernel - RE: [EXT] Re: [PATCH v6 5/8] drm: bridge: Cadence: Add MHDP8501 HDMI driver

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Message-ID: <5686988.DvuYhMxLoT@steina-w>
Date:   Mon, 19 Jun 2023 07:35:36 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     "andrzej.hajda@...el.com" <andrzej.hajda@...el.com>,
        "neil.armstrong@...aro.org" <neil.armstrong@...aro.org>,
        "robert.foss@...aro.org" <robert.foss@...aro.org>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "jonas@...boo.se" <jonas@...boo.se>,
        "jernej.skrabec@...il.com" <jernej.skrabec@...il.com>,
        "airlied@...il.com" <airlied@...il.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-phy@...ts.infradead .org" <linux-phy@...ts.infradead.org>,
        Sandor Yu <sandor.yu@....com>
Cc:     Oliver Brown <oliver.brown@....com>,
        dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: RE: [EXT] Re: [PATCH v6 5/8] drm: bridge: Cadence: Add MHDP8501 HDMI driver

Hi Sandor,

Am Montag, 19. Juni 2023, 05:11:02 CEST schrieb Sandor Yu:
> Hi Alexander,
> 
> Thanks for your comments,
> 
> 
> > -----Original Message-----
> > From: Alexander Stein <alexander.stein@...tq-group.com>
> > Sent: 2023年6月16日 17:30
> > To: andrzej.hajda@...el.com; neil.armstrong@...aro.org;
> > robert.foss@...aro.org; Laurent.pinchart@...asonboard.com;
> > jonas@...boo.se; jernej.skrabec@...il.com; airlied@...il.com;
> > daniel@...ll.ch; robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> > shawnguo@...nel.org; s.hauer@...gutronix.de; festevam@...il.com;
> > vkoul@...nel.org; dri-devel@...ts.freedesktop.org;
> > devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> > linux-kernel@...r.kernel.org; linux-phy@...ts.infradead.org
> > Cc: Oliver Brown <oliver.brown@....com>; Sandor Yu <sandor.yu@....com>;
> > dl-linux-imx <linux-imx@....com>; kernel@...gutronix.de; Sandor Yu
> > <sandor.yu@....com>
> > Subject: [EXT] Re: [PATCH v6 5/8] drm: bridge: Cadence: Add MHDP8501
> > HDMI driver
> >
> >
> >
> > Caution: This is an external email. Please take care when clicking links
> > or
 opening attachments. When in doubt, report the message using the
> > 'Report this email' button
> >
> >
> >
> >
> > Hi Sandor,
> >
> >
> >
> > thanks for sending a new version.
> >
> >
> >
> > Am Donnerstag, 15. Juni 2023, 03:38:15 CEST schrieb Sandor Yu:
> > 
> > > Add a new DRM HDMI bridge driver for Cadence MHDP8501 that used in
> > > Freescale i.MX8MQ SoC.
> > > MHDP8501 could support HDMI or DisplayPort standards according
> > > embedded Firmware running in the uCPU.
> > >
> > >
> > >
> > > For iMX8MQ SoC, the HDMI FW was loaded and activated by SOC ROM
> > 
> > code.
> > 
> > > Bootload binary included HDMI FW was required for the driver.
> > >
> > >
> > >
> > > Signed-off-by: Sandor Yu <Sandor.yu@....com>
> > > ---
> > > 
> > >  drivers/gpu/drm/bridge/cadence/Kconfig        |   12 +
> > >  drivers/gpu/drm/bridge/cadence/Makefile       |    1 +
> > >  .../drm/bridge/cadence/cdns-mhdp8501-hdmi.c   | 1024
> > 
> > +++++++++++++++++
> > 
> > >  3 files changed, 1037 insertions(+)
> > >  create mode 100644
> > > 
> > > drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> > >
> > >
> > >
> > > diff --git a/drivers/gpu/drm/bridge/cadence/Kconfig
> > > b/drivers/gpu/drm/bridge/cadence/Kconfig index
> > > 5b7ec4e49aa1..bee05e834055
> > > 100644
> > > --- a/drivers/gpu/drm/bridge/cadence/Kconfig
> > > +++ b/drivers/gpu/drm/bridge/cadence/Kconfig
> > > @@ -59,3 +59,15 @@ config DRM_CDNS_MHDP8501_DP
> > > 
> > >         Support Cadence MHDP8501 DisplayPort driver.
> > >         Cadence MHDP8501 Controller support one or more protocols,
> > >         DisplayPort firmware is required for this driver.
> > > 
> > > +
> > > +config DRM_CDNS_MHDP8501_HDMI
> > > +     tristate "Cadence MHDP8501 HDMI DRM driver"
> > > +     select DRM_KMS_HELPER
> > > +     select DRM_PANEL_BRIDGE
> > > +     select DRM_DISPLAY_HELPER
> > > +     select DRM_CDNS_AUDIO
> > > +     depends on OF
> > > +     help
> > > +       Support Cadence MHDP8501 HDMI driver.
> > > +       Cadence MHDP8501 Controller support one or more protocols,
> > > +       HDMI firmware is required for this driver.
> > > diff --git a/drivers/gpu/drm/bridge/cadence/Makefile
> > > b/drivers/gpu/drm/bridge/cadence/Makefile index
> > > 5842e4540c62..8a129c14ac14
> > > 100644
> > > --- a/drivers/gpu/drm/bridge/cadence/Makefile
> > > +++ b/drivers/gpu/drm/bridge/cadence/Makefile
> > > @@ -7,3 +7,4 @@ cdns-mhdp8546-y := cdns-mhdp8546-core.o
> > > cdns-mhdp8546-hdcp.o
> > > cdns-mhdp8546-$(CONFIG_DRM_CDNS_MHDP8546_J721E) +=
> > > cdns-mhdp8546-j721e.o
> > >
> > >
> > >
> > >  obj-$(CONFIG_DRM_CDNS_MHDP8501_DP) += cdns-mhdp8501-dp.o
> > > 
> > > +obj-$(CONFIG_DRM_CDNS_MHDP8501_HDMI) += cdns-mhdp8501-hdmi.o
> > > diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> > > b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c new file mode
> > > 100644 index 000000000000..43673f1b50f6
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> > 
> > [...]
> > 
> > > +static int cdns_hdmi_bridge_attach(struct drm_bridge *bridge,
> > > +                              enum drm_bridge_attach_flags flags)
> > 
> > {
> > 
> > > +     struct cdns_mhdp_device *mhdp = bridge->driver_private;
> > > +     struct drm_mode_config *config = &bridge->dev->mode_config;
> > > +     struct drm_encoder *encoder = bridge->encoder;
> > > +     struct drm_connector *connector = &mhdp->connector;
> > > +
> > > +     if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> > > +             connector->interlace_allowed = 0;
> > > +             connector->polled = DRM_CONNECTOR_POLL_HPD;
> > > +
> > > +             drm_connector_helper_add(connector,
> > 
> > &cdns_hdmi_connector_helper_funcs);
> > 
> > > +
> > > +             drm_connector_init(bridge->dev, connector,
> > 
> > &cdns_hdmi_connector_funcs,
> > 
> > > +
> > 
> > DRM_MODE_CONNECTOR_HDMIA);
> > 
> > > +
> > > +             drm_object_attach_property(&connector->base,
> > > +                                        config-
> > >
> > >hdr_output_metadata_property, 0);
> > >
> > > +
> > > +             if
> > > + (!drm_mode_create_hdmi_colorspace_property(connector))
> >
> >
> >
> > This is missing a 2nd parameter.
> 
> I have not found function drm_mode_create_hdmi_colorspace_property need 2nd
> parameter in L6.1.

Ah, I see. The new parameter is/will be part of v6.3.

> And those connector init functions will be remove in
> the next version according Sam's comments, because they are not really
> needed. 

Okay, nice. Please put me on cc as well. Thanks.

Best regards,
Alexander

> B.R
> Sandor
> 
> >
> >
> > > +
> > 
> > drm_object_attach_property(&connector->base,
> > 
> > > +                                             connector-
> > >
> > >colorspace_property, 0);
> > >
> > > +
> > > +             drm_connector_attach_encoder(connector, encoder);
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > 
> > [...]
> >
> >
> >
> > Best regards,
> > Alexander
> > --
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> >
> >
> 
> 


-- 
TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
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Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
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