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drm/i915/lttpr: Enable Extended Wake Timeout

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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@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250122053358.1545039-4-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal 2025-01-22 11:03:58 +05:30
parent eaf53ac490
commit 242d9bf59a
3 changed files with 6 additions and 1 deletions
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4
drivers/gpu/drm/i915/display/intel_ddi.c
View File

@ -2546,6 +2546,7 @@ 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;
intel_dp_set_link_params(intel_dp,
crtc_state->port_clock,
@ -2600,6 +2601,9 @@ 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,

2
drivers/gpu/drm/i915/display/intel_dp_link_training.c
View File

@ -127,7 +127,7 @@ 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] ==

1
drivers/gpu/drm/i915/display/intel_dp_link_training.h
View File

@ -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);