Calculate aux less switch to active latency and store it into alpm_params
struct.
Bspec: 71477
Signed-off-by: Jouni Högander <jouni.hogander@xxxxxxxxx>
---
.../drm/i915/display/intel_display_types.h | 1 +
drivers/gpu/drm/i915/display/intel_psr.c | 26 ++++++++++++++++---
2 files changed, 24 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index a531c1e5af20..df82551a3f42 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1722,6 +1722,7 @@ struct intel_psr {
/* LNL and beyond */
u8 check_entry_lines;
u8 aux_less_wake_lines;
+ u8 switch_to_active_lines;
} alpm_parameters;
ktime_t last_entry_attempt;
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index b139db67df55..4cefb9ada5db 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1154,24 +1154,44 @@ static int _lnl_compute_aux_less_wake_time(int port_clock)
num_ml_phy_lock * tml_phy_lock, 1000);
}
+/*
+ * 128b/132b Switch to Active = 32 * (ML_PHY_LOCK Length + 3 + 64) / fLink (in MHz)
+ * Switch to Active Latency = CEILING( t128b/132b Switch to Active / tLine )
+ * ML_PHY_LOCK Length = 396
+ * The "+3" term is the trailing zero padding after the POST_LT_SCRAMBLER_RESET
+ * The "+64" term represents the MTP timeslots
+ */
+static int _lnl_compute_switch_to_active_time(int port_clock)
+{
+ return 32 * (396 + 3 + 64) / (port_clock / 1000);
+}
+
static int _lnl_compute_aux_less_alpm_params(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = dp_to_i915(intel_dp);
- int aux_less_wake_time, aux_less_wake_lines;
+ int aux_less_wake_time, aux_less_wake_lines, switch_to_active_lines;
aux_less_wake_time =
_lnl_compute_aux_less_wake_time(crtc_state->port_clock / 1000);
aux_less_wake_lines = intel_usecs_to_scanlines(&crtc_state->hw.adjusted_mode,
aux_less_wake_time);
- if (aux_less_wake_lines > 32)
+ switch_to_active_lines =
+ intel_usecs_to_scanlines(
+ &crtc_state->hw.adjusted_mode,
+ _lnl_compute_switch_to_active_time(crtc_state->port_clock / 1000));
+
+ if (aux_less_wake_lines > 32 || switch_to_active_lines > 32)
return false;
- if (i915->display.params.psr_safest_params)
+ if (i915->display.params.psr_safest_params) {
aux_less_wake_lines = 32;
+ switch_to_active_lines = 32;
+ }
intel_dp->psr.alpm_parameters.aux_less_wake_lines = aux_less_wake_lines;
+ intel_dp->psr.alpm_parameters.switch_to_active_lines = switch_to_active_lines;
return true;
}
--
2.34.1
