On Tue, Dec 24, 2024 at 02:46:14AM +0100, Marek Vasut wrote:
> The dw-hdmi output_port is set to 1 in order to look for a connector
> next bridge in order to get DRM_BRIDGE_ATTACH_NO_CONNECTOR working.
> The output_port set to 1 makes the DW HDMI driver core look up the
> next bridge in DT, where the next bridge is often the hdmi-connector .
>
> Similar to 0af5e0b41110 ("drm/meson: encoder_hdmi: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR")
>
> Signed-off-by: Marek Vasut <marex@xxxxxxx>
> ---
> Cc: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxxx>
> Cc: Fabio Estevam <festevam@xxxxxxxxx>
> Cc: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
> Cc: Jonas Karlman <jonas@xxxxxxxxx>
> Cc: Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Liu Ying <victor.liu@xxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Maxime Ripard <mripard@xxxxxxxxxx>
> Cc: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
> Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
> Cc: Robert Foss <rfoss@xxxxxxxxxx>
> Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
> Cc: Simona Vetter <simona@xxxxxxxx>
> Cc: Stefan Agner <stefan@xxxxxxxx>
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: imx@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> ---
> V2: No change
> ---
> drivers/gpu/drm/bridge/imx/Kconfig | 1 +
> drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig
> index 9a480c6abb856..d8e9fbf75edbb 100644
> --- a/drivers/gpu/drm/bridge/imx/Kconfig
> +++ b/drivers/gpu/drm/bridge/imx/Kconfig
> @@ -27,6 +27,7 @@ config DRM_IMX8MP_DW_HDMI_BRIDGE
> config DRM_IMX8MP_HDMI_PVI
> tristate "Freescale i.MX8MP HDMI PVI bridge support"
> depends on OF
> + select DRM_DISPLAY_CONNECTOR
> help
> Choose this to enable support for the internal HDMI TX Parallel
> Video Interface found on the Freescale i.MX8MP SoC.
> diff --git a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
> index 1e7a789ec2890..4ebae5ad072ad 100644
> --- a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
> +++ b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-tx.c
> @@ -101,6 +101,7 @@ static int imx8mp_dw_hdmi_probe(struct platform_device *pdev)
> plat_data->phy_name = "SAMSUNG HDMI TX PHY";
> plat_data->priv_data = hdmi;
> plat_data->phy_force_vendor = true;
> + plat_data->output_port = 1;
Quoting my feedback to a similar Liu's patch:
This will break compatibility with older DT files, which don't have
output port. I think you need to add output_port_optional flag to
dw_hdmi_plat_data and still return 0 from dw_hdmi_parse_dt() if the flag
is set, but there is no remote node.
>
> hdmi->dw_hdmi = dw_hdmi_probe(pdev, plat_data);
> if (IS_ERR(hdmi->dw_hdmi))
> --
> 2.45.2
>
--
With best wishes
Dmitry
