[PATCH] drm/amd/display: Don't disable DP PHY when link loss happens

Zhan Liu zhan.liu at amd.com
Mon Dec 23 20:46:17 UTC 2019

There is a use case that link loss happens accidentally,
and we need to recover that link loss as soon as possible.
Under this circumstance, DP PHY will perform link training,
then try to recover the link that's just lost.

However, if link PHY is disabled by code here, then
DP display will never come back again.

Don't disable DP transmitter and its encoder, even if
link loss is detected.

Signed-off-by: Zhan Liu <zhan.liu at amd.com>
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 38b0f4347383..49f48d432923 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -2876,7 +2876,6 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
 			return false;
 		previous_link_settings = link->cur_link_settings;
-		dp_disable_link_phy(link, pipe_ctx->stream->signal);

More information about the amd-gfx mailing list