Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
On Tue, 2019-10-15 at 16:34 +0200, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> Add a helper to check whether the sink supports ANSI 8B/10B channel
> coding capability as specified in ANSI X3.230-1994, clause 11.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> ---
> include/drm/drm_dp_helper.h | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index def3b3a543a2..7ff7bf0e742d 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -137,6 +137,7 @@
> # define DP_DETAILED_CAP_INFO_AVAILABLE (1 << 4) /* DPI */
>
> #define DP_MAIN_LINK_CHANNEL_CODING 0x006
> +# define DP_CAP_ANSI_8B10B (1 << 0)
>
> #define DP_DOWN_STREAM_PORT_COUNT 0x007
> # define DP_PORT_COUNT_MASK 0x0f
> @@ -1283,6 +1284,12 @@ drm_dp_sink_supports_fec(const u8 fec_capable)
> return fec_capable & DP_FEC_CAPABLE;
> }
>
> +static inline bool
> +drm_dp_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> +{
> + return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_8B10B;
> +}
> +
> /*
> * DisplayPort AUX channel
> */
--
Cheers,
Lyude Paul
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