From c1e3cdf8eed071563f0d036212f4ebc0f2cc1b31 Mon Sep 17 00:00:00 2001 From: Meenakshikumar Somasundaram Date: Mon, 30 Aug 2021 14:01:10 -0400 Subject: [PATCH] drm/amd/display: Link training retry fix for abort case [Why] If link training is aborted, it shall be retried if sink is present. [How] Check hpd status to find out whether sink is present or not. If sink is present, then link training shall be tried again with same settings. Otherwise, link training shall be aborted. Reviewed-by: Jimmy Kizito Acked-by: Mikita Lipski Signed-off-by: Meenakshikumar Somasundaram Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) 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 330edd666b7d8..ceda98a63ff32 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 @@ -1840,9 +1840,13 @@ bool perform_link_training_with_retries( dp_disable_link_phy(link, signal); /* Abort link training if failure due to sink being unplugged. */ - if (status == LINK_TRAINING_ABORT) - break; - else if (do_fallback) { + if (status == LINK_TRAINING_ABORT) { + enum dc_connection_type type = dc_connection_none; + + dc_link_detect_sink(link, &type); + if (type == dc_connection_none) + break; + } else if (do_fallback) { decide_fallback_link_setting(*link_setting, ¤t_setting, status); /* Fail link training if reduced link bandwidth no longer meets * stream requirements. -- 2.39.5