From: Thierry Reding <tred...@nvidia.com>
Make use of ANSI 8B/10B channel coding if the DisplayPort sink supports
it.
Signed-off-by: Thierry Reding <tred...@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 f1a7f18ab795..828dc091b015 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -526,7 +526,7 @@ 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);
@@ -539,6 +539,13 @@ 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);
--
2.15.1
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