drm/amd/display: Wait edp HPD to high in detect_sink

[ Upstream commit 0a6414e75d231ee1bb7ffb2f5eb246b682a884cd ]

[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 <dale.zhao@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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 ef1b350a45e028cdb0a84a6c3428c308b441f6c6..8b69913b6943a5b421a7a8f94f4c3157df61c0ef 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -208,6 +208,9 @@ 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)