From: Thierry Reding <thierry.reding@gmail.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH 16/21] drm/dp: Set channel coding on link configuration
Date: Mon, 5 Aug 2019 14:23:45 +0200 [thread overview]
Message-ID: <20190805122350.8838-16-thierry.reding@gmail.com> (raw)
In-Reply-To: <20190805122350.8838-1-thierry.reding@gmail.com>
From: Thierry Reding <treding@nvidia.com>
Make use of ANSI 8B/10B channel coding if the DisplayPort sink supports
it.
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
drivers/gpu/drm/drm_dp_helper.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index f1f3705fade9..f51a5595ebc0 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -519,7 +519,7 @@ EXPORT_SYMBOL(drm_dp_link_power_down);
*/
int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link)
{
- u8 values[2];
+ u8 values[2], value = 0;
int err;
values[0] = drm_dp_link_rate_to_bw_code(link->rate);
@@ -532,6 +532,13 @@ 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;
+
+ err = drm_dp_dpcd_writeb(aux, DP_MAIN_LINK_CHANNEL_CODING_SET, value);
+ if (err < 0)
+ return err;
+
return 0;
}
EXPORT_SYMBOL(drm_dp_link_configure);
--
2.22.0
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next prev parent reply other threads:[~2019-08-05 12:24 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-05 12:23 [PATCH 01/21] drm/dp: Sort includes alphabetically Thierry Reding
2019-08-05 12:23 ` [PATCH 02/21] drm/dp: Add missing kerneldoc for struct drm_dp_link Thierry Reding
2019-08-05 12:23 ` [PATCH 03/21] drm/dp: Add drm_dp_link_reset() implementation Thierry Reding
2019-08-05 12:23 ` [PATCH 04/21] drm/dp: Track link capabilities alongside settings Thierry Reding
2019-08-08 11:39 ` Andrzej Hajda
2019-08-05 12:23 ` [PATCH 05/21] drm/dp: Turn link capabilities into booleans Thierry Reding
2019-08-08 11:52 ` Andrzej Hajda
2019-08-05 12:23 ` [PATCH 06/21] drm/dp: Probe link using existing parsing helpers Thierry Reding
2019-08-08 13:22 ` Philipp Zabel
2019-08-05 12:23 ` [PATCH 07/21] drm/dp: Read fast training capability from link Thierry Reding
2019-08-08 13:26 ` Philipp Zabel
2019-08-05 12:23 ` [PATCH 08/21] drm/dp: Read TPS3 capability from sink Thierry Reding
2019-08-05 12:23 ` [PATCH 09/21] drm/dp: Read channel coding " Thierry Reding
2019-08-05 12:23 ` [PATCH 10/21] drm/dp: Read alternate scrambler reset " Thierry Reding
2019-08-05 12:23 ` [PATCH 11/21] drm/dp: Read eDP version from DPCD Thierry Reding
2019-08-05 12:23 ` [PATCH 12/21] drm/dp: Read AUX read interval " Thierry Reding
2019-08-05 12:23 ` [PATCH 13/21] drm/dp: Do not busy-loop during link training Thierry Reding
2019-08-08 13:33 ` Philipp Zabel
2019-09-02 10:57 ` Thierry Reding
2019-08-05 12:23 ` [PATCH 14/21] drm/dp: Use drm_dp_aux_rd_interval() Thierry Reding
2019-08-08 13:17 ` Philipp Zabel
2019-09-02 11:06 ` Thierry Reding
2019-08-05 12:23 ` [PATCH 15/21] drm/dp: Add helper to get post-cursor adjustments Thierry Reding
2019-08-08 13:36 ` Philipp Zabel
2019-08-05 12:23 ` Thierry Reding [this message]
2019-08-05 12:23 ` [PATCH 17/21] drm/dp: Enable alternate scrambler reset when supported Thierry Reding
2019-08-05 12:23 ` [PATCH 18/21] drm/dp: Add drm_dp_link_choose() helper Thierry Reding
2019-08-05 12:23 ` [PATCH 19/21] drm/dp: Add support for eDP link rates Thierry Reding
2019-08-05 12:23 ` [PATCH 20/21] drm/dp: Fix a couple of whitespace issues Thierry Reding
2019-08-08 13:18 ` Philipp Zabel
2019-09-02 11:10 ` Thierry Reding
2019-08-05 12:23 ` [PATCH 21/21] drm/bridge: tc358767: Use DP nomenclature Thierry Reding
2019-08-08 11:54 ` Andrzej Hajda
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