[PATCH 5/5] drm/bridge: mhdp8564: Support format negotiation

[Swapnil Kashinath Jakhade]

Hi,

> -----Original Message-----
> From: Nikhil Devshatwar <nikhil.nd at ti.com>
> Sent: Friday, October 16, 2020 4:09 PM
> To: dri-devel at lists.freedesktop.org; Tomi Valkeinen
> <tomi.valkeinen at ti.com>
> Cc: Sekhar Nori <nsekhar at ti.com>; Laurent Pinchart
> <laurent.pinchart at ideasonboard.com>; Swapnil Kashinath Jakhade
> <sjakhade at cadence.com>
> Subject: [PATCH 5/5] drm/bridge: mhdp8564: Support format negotiation
> 

s/mhdp8564/mhdp8546

> EXTERNAL MAIL
> 
> 
> With new connector model, mhdp bridge will not create the connector and
> SoC driver will rely on format negotiation to setup the encoder format.
> 
> Support format negotiations hooks in the drm_bridge_funcs.
> Support a single format for input.
> 
> Signed-off-by: Nikhil Devshatwar <nikhil.nd at ti.com>
> ---
>  .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 29 +++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> index d0c65610ebb5..230f6e28f82f 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> @@ -2078,6 +2078,34 @@ cdns_mhdp_bridge_atomic_reset(struct
> drm_bridge *bridge)
>  	return &cdns_mhdp_state->base;
>  }
> 
> +static u32 *cdns_mhdp_get_input_bus_fmts(struct drm_bridge *bridge,
> +				      struct drm_bridge_state *bridge_state,
> +				      struct drm_crtc_state *crtc_state,
> +				      struct drm_connector_state *conn_state,
> +				      u32 output_fmt,
> +				      unsigned int *num_input_fmts) {
> +	u32 *input_fmts;
> +	u32 default_bus_format = MEDIA_BUS_FMT_RGB121212_1X36;
> +
> +	*num_input_fmts = 0;
> +
> +	/*
> +	 * This bridge does not support media_bus_format conversion
> +	 * Propagate only if supported
> +	 */
> +	if (output_fmt != default_bus_format && output_fmt !=
> MEDIA_BUS_FMT_FIXED)
> +		return NULL;
> +
> +	input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
> +	if (!input_fmts)
> +		return NULL;
> +
> +	*num_input_fmts = 1;
> +	input_fmts[0] = default_bus_format;
> +	return input_fmts;
> +}
> +
>  static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
>  				  struct drm_bridge_state *bridge_state,
>  				  struct drm_crtc_state *crtc_state, @@ -
> 2142,6 +2170,7 @@ static const struct drm_bridge_funcs
> cdns_mhdp_bridge_funcs = {
>  	.atomic_duplicate_state =
> cdns_mhdp_bridge_atomic_duplicate_state,
>  	.atomic_destroy_state = cdns_mhdp_bridge_atomic_destroy_state,
>  	.atomic_reset = cdns_mhdp_bridge_atomic_reset,
> +	.atomic_get_input_bus_fmts = cdns_mhdp_get_input_bus_fmts,
>  	.detect = cdns_mhdp_bridge_detect,
>  	.get_edid = cdns_mhdp_bridge_get_edid,
>  	.hpd_enable = cdns_mhdp_bridge_hpd_enable,
> --
> 2.17.1