From 553769ff8d8c452cc81a5fe5b0a68cc456c31db3 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Wed, 10 Jun 2015 16:35:44 +0200 Subject: [PATCH] drm/tegra: dp: Set channel coding on link configuration Make use of ANSI 8B/10B channel coding if the DisplayPort sink supports it. Signed-off-by: Thierry Reding --- drivers/gpu/drm/tegra/dp.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c index 757a0256592f..ca287b50fad8 100644 --- a/drivers/gpu/drm/tegra/dp.c +++ b/drivers/gpu/drm/tegra/dp.c @@ -203,7 +203,7 @@ int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link) */ int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link) { - u8 values[2]; + u8 values[2], value; int err; values[0] = drm_dp_link_rate_to_bw_code(link->rate); @@ -216,5 +216,14 @@ int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link) if (err < 0) return err; + if (link->caps.channel_coding) + value = DP_SET_ANSI_8B10B; + else + value = 0; + + err = drm_dp_dpcd_writeb(aux, DP_MAIN_LINK_CHANNEL_CODING_SET, value); + if (err < 0) + return err; + return 0; } -- 2.45.2