From 6c651b13e436030f996bcfb2f76833af94e44531 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Mon, 5 Feb 2018 14:07:57 +0100 Subject: [PATCH] drm/tegra: dp: Read channel coding capability from sink Parse from the sink capabilities whether or not it supports ANSI 8B/10B channel coding as specified in ANSI X3.230-1994, clause 11. Signed-off-by: Thierry Reding --- drivers/gpu/drm/tegra/dp.c | 3 +++ drivers/gpu/drm/tegra/dp.h | 7 +++++++ 2 files changed, 10 insertions(+) diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c index e22ebab677b9..0bd87cff4575 100644 --- a/drivers/gpu/drm/tegra/dp.c +++ b/drivers/gpu/drm/tegra/dp.c @@ -13,6 +13,7 @@ static void drm_dp_link_caps_reset(struct drm_dp_link_caps *caps) caps->enhanced_framing = false; caps->tps3_supported = false; caps->fast_training = false; + caps->channel_coding = false; } void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest, @@ -21,6 +22,7 @@ void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest, dest->enhanced_framing = src->enhanced_framing; dest->tps3_supported = src->tps3_supported; dest->fast_training = src->fast_training; + dest->channel_coding = src->channel_coding; } static void drm_dp_link_reset(struct drm_dp_link *link) @@ -67,6 +69,7 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link) link->caps.enhanced_framing = drm_dp_enhanced_frame_cap(dpcd); link->caps.tps3_supported = drm_dp_tps3_supported(dpcd); link->caps.fast_training = drm_dp_fast_training_cap(dpcd); + link->caps.channel_coding = drm_dp_channel_coding_supported(dpcd); link->rate = link->max_rate; link->lanes = link->max_lanes; diff --git a/drivers/gpu/drm/tegra/dp.h b/drivers/gpu/drm/tegra/dp.h index 999078812943..984dac21568e 100644 --- a/drivers/gpu/drm/tegra/dp.h +++ b/drivers/gpu/drm/tegra/dp.h @@ -35,6 +35,13 @@ struct drm_dp_link_caps { * AUX CH handshake not required for link training */ bool fast_training; + + /** + * @channel_coding: + * + * ANSI 8B/10B channel coding capability + */ + bool channel_coding; }; void drm_dp_link_caps_copy(struct drm_dp_link_caps *dest, -- 2.11.0