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 that checks for the fast training capability given the DPCD
> receiver capabilities blob.
>
> 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 52ff1f24a24d..def3b3a543a2 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1211,6 +1211,13 @@ drm_dp_enhanced_frame_cap(const u8
> dpcd[DP_RECEIVER_CAP_SIZE])
> (dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP);
> }
>
> +static inline bool
> +drm_dp_fast_training_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> +{
> + return dpcd[DP_DPCD_REV] >= 0x11 &&
> + (dpcd[DP_MAX_DOWNSPREAD] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING);
> +}
> +
> static inline bool
> drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> {
--
Cheers,
Lyude Paul
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