From 9c90da6d6474d37b86042d5c8fbc23a668adc987 Mon Sep 17 00:00:00 2001 From: Dale Zhao Date: Thu, 22 Nov 2018 17:13:46 +0800 Subject: [PATCH 0963/2940] drm/amd/display: Wait edp HPD to high in detect_sink [Why] In 99% user case, edp will be post by vbios. In 1% / current case: Lenovo don't light up edp panel in vbios post stage, vbios won't be lit up. Thus in dal when we init DCN 10 hw, we power up edp, then we start detect_sink, but internal time is too short, when we detect it, HPD is still low, so we don't detect the edp, and edp shows black. [How] When we init hw, we wait edp HPD to high after power up edp. Signed-off-by: Dale Zhao Reviewed-by: Eric Yang Acked-by: Leo Li Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/core/dc_link.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 9d99cdc14b49..1bebb60ac629 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -215,6 +215,9 @@ bool dc_link_detect_sink(struct dc_link *link, enum dc_connection_type *type) return true; } + if (link->connector_signal == SIGNAL_TYPE_EDP) + link->dc->hwss.edp_wait_for_hpd_ready(link, true); + /* todo: may need to lock gpio access */ hpd_pin = get_hpd_gpio(link->ctx->dc_bios, link->link_id, link->ctx->gpio_service); if (hpd_pin == NULL) -- 2.17.1