Commit d074a40b authored by Jouni Högander's avatar Jouni Högander
Browse files

drm/i915/alpm: Use actual lfps cycle and silence periods in wake time 



Currently we are using maximum lfps cycle and silence period times when
calculating AUXLess wake time. Use actual values instead.

Signed-off-by: default avatarJouni Högander <jouni.hogander@intel.com>
Reviewed-by: default avatarAnimesh Manna <animesh.manna@intel.com>
Link: https://lore.kernel.org/r/20250829053929.3585636-5-jouni.hogander@intel.com
parent cc2189a9

drivers/gpu/drm/i915/display/intel_alpm.c

+5 −7
Original line number Diff line number Diff line
@@ -116,21 +116,19 @@ static int get_lfps_half_cycle_clocks(const struct intel_crtc_state *crtc_state) 
 * tML_PHY_LOCK = TPS4 Length * ( 10 / (Link Rate in MHz) )

 * TPS4 Length = 252 Symbols

 */

static int _lnl_compute_aux_less_wake_time(int port_clock)

static int _lnl_compute_aux_less_wake_time(const struct intel_crtc_state *crtc_state)

{

	int tphy2_p2_to_p0 = 12 * 1000;

	int tlfps_period_max = 800;

	int tsilence_max = 180;

	int t1 = 50 * 1000;

	int tps4 = 252;

	/* port_clock is link rate in 10kbit/s units */

	int tml_phy_lock = 1000 * 1000 * tps4 / port_clock;

	int tml_phy_lock = 1000 * 1000 * tps4 / crtc_state->port_clock;

	int num_ml_phy_lock = 7 + DIV_ROUND_UP(6500, tml_phy_lock) + 1;

	int t2 = num_ml_phy_lock * tml_phy_lock;

	int tcds = 1 * t2;



	return DIV_ROUND_UP(tphy2_p2_to_p0 + tlfps_period_max + tsilence_max +

			    t1 + tcds, 1000);

	return DIV_ROUND_UP(tphy2_p2_to_p0 + get_lfps_cycle_time(crtc_state) +

			    SILENCE_PERIOD_TIME + t1 + tcds, 1000);

}



static int
@@ -142,7 +140,7 @@ _lnl_compute_aux_less_alpm_params(struct intel_dp *intel_dp, 
		lfps_half_cycle;



	aux_less_wake_time =

		_lnl_compute_aux_less_wake_time(crtc_state->port_clock);

		_lnl_compute_aux_less_wake_time(crtc_state);

	aux_less_wake_lines = intel_usecs_to_scanlines(&crtc_state->hw.adjusted_mode,

						       aux_less_wake_time);

	silence_period = get_silence_period_symbols(crtc_state);