[PATCH 24/24] drm/amd/display: Extend AUX timeout for DP initial reads

[Anson Jacob]

From: Wesley Chalmers <Wesley.Chalmers at amd.com>

[WHY]
DP LL Compliance tests require that the first DPCD transactions after a
hotplug have a timeout interval of 3.2 ms.  In cases where LTTPR is
disabled, this means that the first reads from DP_SET_POWER and DP_DPCD_REV must have an extended
timeout.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers at amd.com>
Reviewed-by: Jun Lei <Jun.Lei at amd.com>
Acked-by: Anson Jacob <Anson.Jacob at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 7 +++----
 1 file changed, 3 insertions(+), 4 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 1b28b4a40f62..5ecbe525b676 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
@@ -3750,9 +3750,6 @@ static bool retrieve_link_cap(struct dc_link *link)
 			LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD);
 
 	is_lttpr_present = dp_retrieve_lttpr_cap(link);
-	if (!is_lttpr_present)
-		dc_link_aux_try_to_configure_timeout(link->ddc, LINK_AUX_DEFAULT_TIMEOUT_PERIOD);
-
 
 	status = core_link_read_dpcd(link, DP_SET_POWER,
 			&dpcd_power_state, sizeof(dpcd_power_state));
@@ -3781,12 +3778,14 @@ static bool retrieve_link_cap(struct dc_link *link)
 			break;
 	}
 
-
 	if (status != DC_OK) {
 		dm_error("%s: Read receiver caps dpcd data failed.\n", __func__);
 		return false;
 	}
 
+	if (!is_lttpr_present)
+		dc_link_aux_try_to_configure_timeout(link->ddc, LINK_AUX_DEFAULT_TIMEOUT_PERIOD);
+
 	{
 		union training_aux_rd_interval aux_rd_interval;
 
-- 
2.25.1