[PATCH 1/4] drm: Add I2C connector type

[Sam Ravnborg]

On Mon, Jan 31, 2022 at 09:12:21PM +0100, Javier Martinez Canillas wrote:
> There isn't a connector type for display controllers accesed through I2C,
> most drivers use DRM_MODE_CONNECTOR_Unknown or DRM_MODE_CONNECTOR_VIRTUAL.
> 
> Add an I2C connector type to match the actual connector.
> 
> As Noralf Trønnes mentions in commit fc06bf1d76d6 ("drm: Add SPI connector
> type"), user-space should be able to cope with a connector type that does
> not yet understand.
> 
> Tested with `modetest -M ssd1307 -c` and shows the connector as unknown-1.
I had expected unknown-21??

> 
> Signed-off-by: Javier Martinez Canillas <javierm at redhat.com>
Reviewed-by: Sam Ravnborg <sam at ravnborg.org>
> ---
> 
>  drivers/gpu/drm/drm_connector.c | 1 +
>  include/uapi/drm/drm_mode.h     | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index a50c82bc2b2f..975a7525a508 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -105,6 +105,7 @@ static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
>  	{ DRM_MODE_CONNECTOR_WRITEBACK, "Writeback" },
>  	{ DRM_MODE_CONNECTOR_SPI, "SPI" },
>  	{ DRM_MODE_CONNECTOR_USB, "USB" },
> +	{ DRM_MODE_CONNECTOR_I2C, "I2C" },
>  };
>  
>  void drm_connector_ida_init(void)
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index e1e351682872..d6d6288242db 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -421,6 +421,7 @@ enum drm_mode_subconnector {
>  #define DRM_MODE_CONNECTOR_WRITEBACK	18
>  #define DRM_MODE_CONNECTOR_SPI		19
>  #define DRM_MODE_CONNECTOR_USB		20
> +#define DRM_MODE_CONNECTOR_I2C		21
>  
>  /**
>   * struct drm_mode_get_connector - Get connector metadata.
> -- 
> 2.34.1