On 2019-12-13 3:08 p.m., mikita.lipski@xxxxxxx wrote:
> From: Mikita Lipski <mikita.lipski@xxxxxxx>
>
> [why]
> Need to calculate VCPI slots differently for DSC
> to take in account current link rate, link count
> and FEC.
> [how]
> Add helper to get pbn_div from dc_link
>
> Cc: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: Lyude Paul <lyude@xxxxxxxxxx>
> Signed-off-by: Mikita Lipski <mikita.lipski@xxxxxxx>
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 8 ++++++++
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h | 2 ++
> 2 files changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 7557edee7db0..c376c8ccd391 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -491,3 +491,11 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
> aconnector->connector_id);
> }
>
> +int dm_mst_get_pbn_divider(struct dc_link *link)
> +{
> + if (!link)
> + return 0;
> +
> + return dc_link_bandwidth_kbps(link,
> + dc_link_get_link_cap(link)) / (8 * 1000 * 54);
Had to take a look at the DP spec to understand this conversion here, section 2.6.4.1.
LGTM,
Reviewed-by: Leo Li <sunpeng.li@xxxxxxx>
> +}
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> index 2da851b40042..a553ea046185 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> @@ -29,6 +29,8 @@
> struct amdgpu_display_manager;
> struct amdgpu_dm_connector;
>
> +int dm_mst_get_pbn_divider(struct dc_link *link);
> +
> void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
> struct amdgpu_dm_connector *aconnector);
>
>
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