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

[Sandor Yu]

Hi Alexander,

Thanks for your comments,

> -----Original Message-----
> From: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
> Sent: 2023年6月16日 17:30
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> Cc: Oliver Brown <oliver.brown@xxxxxxx>; Sandor Yu <sandor.yu@xxxxxxx>;
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> <sandor.yu@xxxxxxx>
> Subject: [EXT] Re: [PATCH v6 5/8] drm: bridge: Cadence: Add MHDP8501
> HDMI driver
>
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>
> 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@xxxxxxx>
> > ---
> >  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.
And those connector init functions will be remove in the next version according Sam's comments, because they are not really needed.

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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