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 <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>

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 4dc5846de5c4b24f8d7f71d2f2c2bbe2b821d661..564f140d4e60f3c5a287851f44098f5e9e2dedfe 100644 (file)
--- 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)