[PATCH 3/3] drm/i915/lttpr: Enable Extended Wake Timeout

[Suraj Kandpal]

Usually retimers take around 30 to 40ms to exit all devices from
sleep state. Extended wake timeout mechanism helps to give
that additional time.

--v2
-Grant the requested time only if greater than 1ms [Arun/Jani]
-Reframe commit message [Arun]

--v3
-Move the function to drm_core [Dmitry/Jani]

Spec: DP v2.1 Section 3.6.12.3
Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c              | 4 ++++
 drivers/gpu/drm/i915/display/intel_dp_link_training.c | 2 +-
 drivers/gpu/drm/i915/display/intel_dp_link_training.h | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index acb986bc1f33..0aec4b958af6 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2594,6 +2594,7 @@ static void mtl_ddi_pre_enable_dp(struct intel_atomic_state *state,
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 	bool is_mst = intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST);
+	bool transparent_mode;
 	int ret;
 
 	intel_dp_set_link_params(intel_dp,
@@ -2645,6 +2646,9 @@ static void mtl_ddi_pre_enable_dp(struct intel_atomic_state *state,
 	if (!is_mst)
 		intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
 
+	transparent_mode = intel_dp_lttpr_transparent_mode_enabled(intel_dp);
+	drm_dp_lttpr_wake_timeout_setup(&intel_dp->aux, transparent_mode);
+
 	intel_dp_configure_protocol_converter(intel_dp, crtc_state);
 	if (!is_mst)
 		intel_dp_sink_enable_decompression(state,
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index 8b1977cfec50..c0f8473e7223 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -128,7 +128,7 @@ intel_dp_set_lttpr_transparent_mode(struct intel_dp *intel_dp, bool enable)
 	return true;
 }
 
-static bool intel_dp_lttpr_transparent_mode_enabled(struct intel_dp *intel_dp)
+bool intel_dp_lttpr_transparent_mode_enabled(struct intel_dp *intel_dp)
 {
 	return intel_dp->lttpr_common_caps[DP_PHY_REPEATER_MODE -
 					   DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV] ==
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.h b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
index 2066b9146762..46614124569f 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
@@ -15,6 +15,7 @@ struct intel_dp;
 
 int intel_dp_read_dprx_caps(struct intel_dp *intel_dp, u8 dpcd[DP_RECEIVER_CAP_SIZE]);
 int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp);
+bool intel_dp_lttpr_transparent_mode_enabled(struct intel_dp *intel_dp);
 
 void intel_dp_link_training_set_mode(struct intel_dp *intel_dp,
 				     int link_rate, bool is_vrr);
-- 
2.34.1