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

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Date:   Fri, 16 Jun 2023 11:29:57 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
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@....com, Sandor.yu@....com, linux-imx@....com,
        kernel@...gutronix.de, Sandor Yu <Sandor.yu@....com>
Subject: Re: [PATCH v6 5/8] drm: bridge: Cadence: Add MHDP8501 HDMI driver

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.

> +			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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