[Intel-gfx] [PATCH 1/2] A Helper function that returns available link bandwidth

[Pandiyan, Dhinakaran]

On Thu, 2016-08-11 at 16:41 -0700, Anusha Srivatsa wrote:
> drm/dp/mst
> 
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
> 
> Add a function that returns the available link bandwidth for
> MST port so that we can accurately determine whether a new
> mode is valid for the link or not.
> 

The Signed-off line should follow the explanation body.

> Cc: dri-devel at lists.freedesktop.org
> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 12 ++++++++++++
>  include/drm/drm_dp_mst_helper.h       |  1 +
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 04e4571..7a239f6 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -43,6 +43,8 @@ static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
>  				  char *buf);
>  static int test_calc_pbn_mode(void);
>  
> +int drm_dp_mst_get_avail_pbn(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
> +
>  static void drm_dp_put_port(struct drm_dp_mst_port *port);
>  
>  static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
> @@ -2730,6 +2732,16 @@ static int test_calc_pbn_mode(void)
>  	return 0;
>  }
>  
> +int drm_dp_mst_get_avail_pbn(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
> +{
> +        port = drm_dp_get_validated_port_ref(mgr,port);
> +        if (port)
> +                return port->available_pbn;
> +
> +        return -EINVAL;
> +}
> +EXPORT_SYMBOL(drm_dp_mst_get_avail_pbn);
> +
>  /* we want to kick the TX after we've ack the up/down IRQs. */
>  static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
>  {
> diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
> index 0032076..74dc4ab 100644
> --- a/include/drm/drm_dp_mst_helper.h
> +++ b/include/drm/drm_dp_mst_helper.h
> @@ -576,6 +576,7 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_
>  
>  int drm_dp_calc_pbn_mode(int clock, int bpp);
>  
> +int drm_dp_mst_get_avail_pbn(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
>  
>  bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
>