| 1 | // SPDX-License-Identifier: MIT | 
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| 2 | /* | 
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| 3 | * Copyright 2024, Intel Corporation. | 
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| 4 | */ | 
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| 5 |  | 
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| 6 | #include <linux/debugfs.h> | 
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| 7 |  | 
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| 8 | #include <drm/drm_print.h> | 
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| 9 |  | 
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| 10 | #include "intel_alpm.h" | 
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| 11 | #include "intel_crtc.h" | 
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| 12 | #include "intel_de.h" | 
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| 13 | #include "intel_display_types.h" | 
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| 14 | #include "intel_dp.h" | 
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| 15 | #include "intel_dp_aux.h" | 
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| 16 | #include "intel_psr.h" | 
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| 17 | #include "intel_psr_regs.h" | 
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| 18 |  | 
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| 19 | #define SILENCE_PERIOD_MIN_TIME	80 | 
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| 20 | #define SILENCE_PERIOD_MAX_TIME	180 | 
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| 21 | #define SILENCE_PERIOD_TIME	(SILENCE_PERIOD_MIN_TIME +	\ | 
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| 22 | (SILENCE_PERIOD_MAX_TIME -	\ | 
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| 23 | SILENCE_PERIOD_MIN_TIME) / 2) | 
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| 24 |  | 
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| 25 | #define LFPS_CYCLE_COUNT 10 | 
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| 26 |  | 
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| 27 | bool intel_alpm_aux_wake_supported(struct intel_dp *intel_dp) | 
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| 28 | { | 
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| 29 | return intel_dp->alpm_dpcd & DP_ALPM_CAP; | 
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| 30 | } | 
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| 31 |  | 
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| 32 | bool intel_alpm_aux_less_wake_supported(struct intel_dp *intel_dp) | 
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| 33 | { | 
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| 34 | return intel_dp->alpm_dpcd & DP_ALPM_AUX_LESS_CAP; | 
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| 35 | } | 
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| 36 |  | 
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| 37 | bool intel_alpm_is_alpm_aux_less(struct intel_dp *intel_dp, | 
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| 38 | const struct intel_crtc_state *crtc_state) | 
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| 39 | { | 
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| 40 | return intel_psr_needs_alpm_aux_less(intel_dp, crtc_state) || | 
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| 41 | (crtc_state->has_lobf && intel_alpm_aux_less_wake_supported(intel_dp)); | 
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| 42 | } | 
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| 43 |  | 
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| 44 | void intel_alpm_init(struct intel_dp *intel_dp) | 
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| 45 | { | 
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| 46 | u8 dpcd; | 
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| 47 |  | 
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| 48 | if (drm_dp_dpcd_readb(aux: &intel_dp->aux, DP_RECEIVER_ALPM_CAP, valuep: &dpcd) < 0) | 
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| 49 | return; | 
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| 50 |  | 
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| 51 | intel_dp->alpm_dpcd = dpcd; | 
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| 52 | mutex_init(&intel_dp->alpm_parameters.lock); | 
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| 53 | } | 
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| 54 |  | 
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| 55 | static int get_silence_period_symbols(const struct intel_crtc_state *crtc_state) | 
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| 56 | { | 
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| 57 | return SILENCE_PERIOD_TIME * intel_dp_link_symbol_clock(rate: crtc_state->port_clock) / | 
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| 58 | 1000 / 1000; | 
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| 59 | } | 
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| 60 |  | 
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| 61 | static int get_lfps_cycle_min_max_time(const struct intel_crtc_state *crtc_state, | 
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| 62 | int *min, int *max) | 
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| 63 | { | 
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| 64 | if (crtc_state->port_clock < 540000) { | 
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| 65 | *min = 65 * LFPS_CYCLE_COUNT; | 
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| 66 | *max = 75 * LFPS_CYCLE_COUNT; | 
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| 67 | } else if (crtc_state->port_clock <= 810000) { | 
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| 68 | *min = 140; | 
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| 69 | *max = 800; | 
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| 70 | } else { | 
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| 71 | *min = *max = -1; | 
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| 72 | return -1; | 
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| 73 | } | 
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| 74 |  | 
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| 75 | return 0; | 
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| 76 | } | 
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| 77 |  | 
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| 78 | static int get_lfps_cycle_time(const struct intel_crtc_state *crtc_state) | 
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| 79 | { | 
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| 80 | int tlfps_cycle_min, tlfps_cycle_max, ret; | 
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| 81 |  | 
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| 82 | ret = get_lfps_cycle_min_max_time(crtc_state, min: &tlfps_cycle_min, | 
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| 83 | max: &tlfps_cycle_max); | 
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| 84 | if (ret) | 
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| 85 | return ret; | 
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| 86 |  | 
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| 87 | return tlfps_cycle_min +  (tlfps_cycle_max - tlfps_cycle_min) / 2; | 
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| 88 | } | 
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| 89 |  | 
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| 90 | static int get_lfps_half_cycle_clocks(const struct intel_crtc_state *crtc_state) | 
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| 91 | { | 
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| 92 | int lfps_cycle_time = get_lfps_cycle_time(crtc_state); | 
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| 93 |  | 
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| 94 | if (lfps_cycle_time < 0) | 
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| 95 | return -1; | 
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| 96 |  | 
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| 97 | return lfps_cycle_time * crtc_state->port_clock / 1000 / 1000 / (2 * LFPS_CYCLE_COUNT); | 
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| 98 | } | 
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| 99 |  | 
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| 100 | /* | 
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| 101 | * AUX-Less Wake Time = CEILING( ((PHY P2 to P0) + tLFPS_Period, Max+ | 
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| 102 | * tSilence, Max+ tPHY Establishment + tCDS) / tline) | 
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| 103 | * For the "PHY P2 to P0" latency see the PHY Power Control page | 
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| 104 | * (PHY P2 to P0) : https://gfxspecs.intel.com/Predator/Home/Index/68965 | 
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| 105 | * : 12 us | 
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| 106 | * The tLFPS_Period, Max term is 800ns | 
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| 107 | * The tSilence, Max term is 180ns | 
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| 108 | * The tPHY Establishment (a.k.a. t1) term is 50us | 
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| 109 | * The tCDS term is 1 or 2 times t2 | 
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| 110 | * t2 = Number ML_PHY_LOCK * tML_PHY_LOCK | 
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| 111 | * Number ML_PHY_LOCK = ( 7 + CEILING( 6.5us / tML_PHY_LOCK ) + 1) | 
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| 112 | * Rounding up the 6.5us padding to the next ML_PHY_LOCK boundary and | 
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| 113 | * adding the "+ 1" term ensures all ML_PHY_LOCK sequences that start | 
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| 114 | * within the CDS period complete within the CDS period regardless of | 
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| 115 | * entry into the period | 
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| 116 | * tML_PHY_LOCK = TPS4 Length * ( 10 / (Link Rate in MHz) ) | 
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| 117 | * TPS4 Length = 252 Symbols | 
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| 118 | */ | 
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| 119 | static int _lnl_compute_aux_less_wake_time(const struct intel_crtc_state *crtc_state) | 
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| 120 | { | 
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| 121 | int tphy2_p2_to_p0 = 12 * 1000; | 
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| 122 | int t1 = 50 * 1000; | 
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| 123 | int tps4 = 252; | 
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| 124 | /* port_clock is link rate in 10kbit/s units */ | 
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| 125 | int tml_phy_lock = 1000 * 1000 * tps4 / crtc_state->port_clock; | 
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| 126 | int num_ml_phy_lock = 7 + DIV_ROUND_UP(6500, tml_phy_lock) + 1; | 
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| 127 | int t2 = num_ml_phy_lock * tml_phy_lock; | 
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| 128 | int tcds = 1 * t2; | 
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| 129 |  | 
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| 130 | return DIV_ROUND_UP(tphy2_p2_to_p0 + get_lfps_cycle_time(crtc_state) + | 
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| 131 | SILENCE_PERIOD_TIME + t1 + tcds, 1000); | 
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| 132 | } | 
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| 133 |  | 
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| 134 | static int | 
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| 135 | _lnl_compute_aux_less_alpm_params(struct intel_dp *intel_dp, | 
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| 136 | const struct intel_crtc_state *crtc_state) | 
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| 137 | { | 
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| 138 | struct intel_display *display = to_intel_display(intel_dp); | 
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| 139 | int aux_less_wake_time, aux_less_wake_lines, silence_period, | 
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| 140 | lfps_half_cycle; | 
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| 141 |  | 
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| 142 | aux_less_wake_time = | 
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| 143 | _lnl_compute_aux_less_wake_time(crtc_state); | 
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| 144 | aux_less_wake_lines = intel_usecs_to_scanlines(adjusted_mode: &crtc_state->hw.adjusted_mode, | 
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| 145 | usecs: aux_less_wake_time); | 
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| 146 | silence_period = get_silence_period_symbols(crtc_state); | 
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| 147 |  | 
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| 148 | lfps_half_cycle = get_lfps_half_cycle_clocks(crtc_state); | 
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| 149 | if (lfps_half_cycle < 0) | 
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| 150 | return false; | 
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| 151 |  | 
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| 152 | if (aux_less_wake_lines > ALPM_CTL_AUX_LESS_WAKE_TIME_MASK || | 
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| 153 | silence_period > PORT_ALPM_CTL_SILENCE_PERIOD_MASK || | 
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| 154 | lfps_half_cycle > PORT_ALPM_LFPS_CTL_LAST_LFPS_HALF_CYCLE_DURATION_MASK) | 
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| 155 | return false; | 
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| 156 |  | 
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| 157 | if (display->params.psr_safest_params) | 
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| 158 | aux_less_wake_lines = ALPM_CTL_AUX_LESS_WAKE_TIME_MASK; | 
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| 159 |  | 
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| 160 | intel_dp->alpm_parameters.aux_less_wake_lines = aux_less_wake_lines; | 
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| 161 | intel_dp->alpm_parameters.silence_period_sym_clocks = silence_period; | 
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| 162 | intel_dp->alpm_parameters.lfps_half_cycle_num_of_syms = lfps_half_cycle; | 
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| 163 |  | 
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| 164 | return true; | 
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| 165 | } | 
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| 166 |  | 
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| 167 | static bool _lnl_compute_alpm_params(struct intel_dp *intel_dp, | 
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| 168 | const struct intel_crtc_state *crtc_state) | 
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| 169 | { | 
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| 170 | struct intel_display *display = to_intel_display(intel_dp); | 
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| 171 | int check_entry_lines; | 
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| 172 |  | 
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| 173 | if (DISPLAY_VER(display) < 20) | 
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| 174 | return true; | 
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| 175 |  | 
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| 176 | /* ALPM Entry Check = 2 + CEILING( 5us /tline ) */ | 
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| 177 | check_entry_lines = 2 + | 
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| 178 | intel_usecs_to_scanlines(adjusted_mode: &crtc_state->hw.adjusted_mode, usecs: 5); | 
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| 179 |  | 
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| 180 | if (check_entry_lines > 15) | 
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| 181 | return false; | 
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| 182 |  | 
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| 183 | if (!_lnl_compute_aux_less_alpm_params(intel_dp, crtc_state)) | 
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| 184 | return false; | 
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| 185 |  | 
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| 186 | if (display->params.psr_safest_params) | 
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| 187 | check_entry_lines = 15; | 
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| 188 |  | 
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| 189 | intel_dp->alpm_parameters.check_entry_lines = check_entry_lines; | 
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| 190 |  | 
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| 191 | return true; | 
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| 192 | } | 
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| 193 |  | 
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| 194 | /* | 
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| 195 | * IO wake time for DISPLAY_VER < 12 is not directly mentioned in Bspec. There | 
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| 196 | * are 50 us io wake time and 32 us fast wake time. Clearly preharge pulses are | 
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| 197 | * not (improperly) included in 32 us fast wake time. 50 us - 32 us = 18 us. | 
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| 198 | */ | 
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| 199 | static int skl_io_buffer_wake_time(void) | 
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| 200 | { | 
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| 201 | return 18; | 
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| 202 | } | 
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| 203 |  | 
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| 204 | static int tgl_io_buffer_wake_time(void) | 
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| 205 | { | 
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| 206 | return 10; | 
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| 207 | } | 
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| 208 |  | 
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| 209 | static int io_buffer_wake_time(const struct intel_crtc_state *crtc_state) | 
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| 210 | { | 
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| 211 | struct intel_display *display = to_intel_display(crtc_state); | 
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| 212 |  | 
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| 213 | if (DISPLAY_VER(display) >= 12) | 
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| 214 | return tgl_io_buffer_wake_time(); | 
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| 215 | else | 
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| 216 | return skl_io_buffer_wake_time(); | 
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| 217 | } | 
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| 218 |  | 
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| 219 | bool intel_alpm_compute_params(struct intel_dp *intel_dp, | 
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| 220 | const struct intel_crtc_state *crtc_state) | 
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| 221 | { | 
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| 222 | struct intel_display *display = to_intel_display(intel_dp); | 
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| 223 | int io_wake_lines, io_wake_time, fast_wake_lines, fast_wake_time; | 
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| 224 | int tfw_exit_latency = 20; /* eDP spec */ | 
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| 225 | int phy_wake = 4;	   /* eDP spec */ | 
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| 226 | int preamble = 8;	   /* eDP spec */ | 
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| 227 | int precharge = intel_dp_aux_fw_sync_len(intel_dp) - preamble; | 
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| 228 | u8 max_wake_lines; | 
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| 229 |  | 
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| 230 | io_wake_time = max(precharge, io_buffer_wake_time(crtc_state)) + | 
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| 231 | preamble + phy_wake + tfw_exit_latency; | 
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| 232 | fast_wake_time = precharge + preamble + phy_wake + | 
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| 233 | tfw_exit_latency; | 
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| 234 |  | 
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| 235 | if (DISPLAY_VER(display) >= 20) | 
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| 236 | max_wake_lines = 68; | 
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| 237 | else if (DISPLAY_VER(display) >= 12) | 
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| 238 | max_wake_lines = 12; | 
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| 239 | else | 
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| 240 | max_wake_lines = 8; | 
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| 241 |  | 
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| 242 | io_wake_lines = intel_usecs_to_scanlines( | 
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| 243 | adjusted_mode: &crtc_state->hw.adjusted_mode, usecs: io_wake_time); | 
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| 244 | fast_wake_lines = intel_usecs_to_scanlines( | 
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| 245 | adjusted_mode: &crtc_state->hw.adjusted_mode, usecs: fast_wake_time); | 
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| 246 |  | 
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| 247 | if (io_wake_lines > max_wake_lines || | 
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| 248 | fast_wake_lines > max_wake_lines) | 
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| 249 | return false; | 
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| 250 |  | 
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| 251 | if (!_lnl_compute_alpm_params(intel_dp, crtc_state)) | 
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| 252 | return false; | 
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| 253 |  | 
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| 254 | if (display->params.psr_safest_params) | 
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| 255 | io_wake_lines = fast_wake_lines = max_wake_lines; | 
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| 256 |  | 
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| 257 | /* According to Bspec lower limit should be set as 7 lines. */ | 
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| 258 | intel_dp->alpm_parameters.io_wake_lines = max(io_wake_lines, 7); | 
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| 259 | intel_dp->alpm_parameters.fast_wake_lines = max(fast_wake_lines, 7); | 
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| 260 |  | 
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| 261 | return true; | 
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| 262 | } | 
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| 263 |  | 
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| 264 | void intel_alpm_lobf_compute_config(struct intel_dp *intel_dp, | 
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| 265 | struct intel_crtc_state *crtc_state, | 
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| 266 | struct drm_connector_state *conn_state) | 
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| 267 | { | 
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| 268 | struct intel_display *display = to_intel_display(intel_dp); | 
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| 269 | struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode; | 
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| 270 | int waketime_in_lines, first_sdp_position; | 
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| 271 | int context_latency, guardband; | 
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| 272 |  | 
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| 273 | if (intel_dp->alpm_parameters.lobf_disable_debug) { | 
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| 274 | drm_dbg_kms(display->drm, "LOBF is disabled by debug flag\n"); | 
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| 275 | return; | 
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| 276 | } | 
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| 277 |  | 
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| 278 | if (intel_dp->alpm_parameters.sink_alpm_error) | 
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| 279 | return; | 
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| 280 |  | 
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| 281 | if (!intel_dp_is_edp(intel_dp)) | 
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| 282 | return; | 
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| 283 |  | 
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| 284 | if (DISPLAY_VER(display) < 20) | 
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| 285 | return; | 
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| 286 |  | 
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| 287 | if (!intel_dp->as_sdp_supported) | 
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| 288 | return; | 
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| 289 |  | 
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| 290 | if (crtc_state->has_psr) | 
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| 291 | return; | 
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| 292 |  | 
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| 293 | if (crtc_state->vrr.vmin != crtc_state->vrr.vmax || | 
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| 294 | crtc_state->vrr.vmin != crtc_state->vrr.flipline) | 
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| 295 | return; | 
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| 296 |  | 
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| 297 | if (!(intel_alpm_aux_wake_supported(intel_dp) || | 
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| 298 | intel_alpm_aux_less_wake_supported(intel_dp))) | 
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| 299 | return; | 
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| 300 |  | 
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| 301 | if (!intel_alpm_compute_params(intel_dp, crtc_state)) | 
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| 302 | return; | 
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| 303 |  | 
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| 304 | context_latency = adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay; | 
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| 305 | guardband = adjusted_mode->crtc_vtotal - | 
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| 306 | adjusted_mode->crtc_vdisplay - context_latency; | 
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| 307 | first_sdp_position = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vsync_start; | 
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| 308 | if (intel_alpm_aux_less_wake_supported(intel_dp)) | 
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| 309 | waketime_in_lines = intel_dp->alpm_parameters.io_wake_lines; | 
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| 310 | else | 
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| 311 | waketime_in_lines = intel_dp->alpm_parameters.aux_less_wake_lines; | 
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| 312 |  | 
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| 313 | crtc_state->has_lobf = (context_latency + guardband) > | 
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| 314 | (first_sdp_position + waketime_in_lines); | 
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| 315 | } | 
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| 316 |  | 
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| 317 | static void lnl_alpm_configure(struct intel_dp *intel_dp, | 
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| 318 | const struct intel_crtc_state *crtc_state) | 
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| 319 | { | 
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| 320 | struct intel_display *display = to_intel_display(intel_dp); | 
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| 321 | enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; | 
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| 322 | u32 alpm_ctl; | 
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| 323 |  | 
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| 324 | if (DISPLAY_VER(display) < 20 || (!intel_psr_needs_alpm(intel_dp, crtc_state) && | 
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| 325 | !crtc_state->has_lobf)) | 
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| 326 | return; | 
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| 327 |  | 
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| 328 | mutex_lock(lock: &intel_dp->alpm_parameters.lock); | 
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| 329 | /* | 
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| 330 | * Panel Replay on eDP is always using ALPM aux less. I.e. no need to | 
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| 331 | * check panel support at this point. | 
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| 332 | */ | 
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| 333 | if (intel_alpm_is_alpm_aux_less(intel_dp, crtc_state)) { | 
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| 334 | alpm_ctl = ALPM_CTL_ALPM_ENABLE | | 
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| 335 | ALPM_CTL_ALPM_AUX_LESS_ENABLE | | 
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| 336 | ALPM_CTL_AUX_LESS_SLEEP_HOLD_TIME_50_SYMBOLS | | 
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| 337 | ALPM_CTL_AUX_LESS_WAKE_TIME(intel_dp->alpm_parameters.aux_less_wake_lines); | 
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| 338 |  | 
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| 339 | if (intel_dp->as_sdp_supported) { | 
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| 340 | u32 pr_alpm_ctl = PR_ALPM_CTL_ADAPTIVE_SYNC_SDP_POSITION_T1; | 
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| 341 |  | 
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| 342 | if (intel_dp->pr_dpcd[INTEL_PR_DPCD_INDEX(DP_PANEL_REPLAY_CAP_CAPABILITY)] & | 
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| 343 | DP_PANEL_REPLAY_LINK_OFF_SUPPORTED_IN_PR_AFTER_ADAPTIVE_SYNC_SDP) | 
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| 344 | pr_alpm_ctl |= PR_ALPM_CTL_ALLOW_LINK_OFF_BETWEEN_AS_SDP_AND_SU; | 
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| 345 | if (!(intel_dp->pr_dpcd[INTEL_PR_DPCD_INDEX(DP_PANEL_REPLAY_CAP_CAPABILITY)] & | 
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| 346 | DP_PANEL_REPLAY_ASYNC_VIDEO_TIMING_NOT_SUPPORTED_IN_PR)) | 
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| 347 | pr_alpm_ctl |= PR_ALPM_CTL_AS_SDP_TRANSMISSION_IN_ACTIVE_DISABLE; | 
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| 348 |  | 
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| 349 | intel_de_write(display, PR_ALPM_CTL(display, cpu_transcoder), | 
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| 350 | val: pr_alpm_ctl); | 
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| 351 | } | 
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| 352 |  | 
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| 353 | } else { | 
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| 354 | alpm_ctl = ALPM_CTL_EXTENDED_FAST_WAKE_ENABLE | | 
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| 355 | ALPM_CTL_EXTENDED_FAST_WAKE_TIME(intel_dp->alpm_parameters.fast_wake_lines); | 
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| 356 | } | 
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| 357 |  | 
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| 358 | if (crtc_state->has_lobf) { | 
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| 359 | alpm_ctl |= ALPM_CTL_LOBF_ENABLE; | 
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| 360 | drm_dbg_kms(display->drm, "Link off between frames (LOBF) enabled\n"); | 
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| 361 | } | 
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| 362 |  | 
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| 363 | alpm_ctl |= ALPM_CTL_ALPM_ENTRY_CHECK(intel_dp->alpm_parameters.check_entry_lines); | 
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| 364 |  | 
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| 365 | intel_de_write(display, ALPM_CTL(display, cpu_transcoder), val: alpm_ctl); | 
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| 366 | mutex_unlock(lock: &intel_dp->alpm_parameters.lock); | 
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| 367 | } | 
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| 368 |  | 
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| 369 | void intel_alpm_configure(struct intel_dp *intel_dp, | 
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| 370 | const struct intel_crtc_state *crtc_state) | 
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| 371 | { | 
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| 372 | lnl_alpm_configure(intel_dp, crtc_state); | 
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| 373 | intel_dp->alpm_parameters.transcoder = crtc_state->cpu_transcoder; | 
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| 374 | } | 
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| 375 |  | 
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| 376 | void intel_alpm_port_configure(struct intel_dp *intel_dp, | 
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| 377 | const struct intel_crtc_state *crtc_state) | 
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| 378 | { | 
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| 379 | struct intel_display *display = to_intel_display(intel_dp); | 
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| 380 | enum port port = dp_to_dig_port(intel_dp)->base.port; | 
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| 381 | u32 alpm_ctl_val = 0, lfps_ctl_val = 0; | 
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| 382 |  | 
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| 383 | if (DISPLAY_VER(display) < 20) | 
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| 384 | return; | 
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| 385 |  | 
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| 386 | if (intel_alpm_is_alpm_aux_less(intel_dp, crtc_state)) { | 
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| 387 | alpm_ctl_val = PORT_ALPM_CTL_ALPM_AUX_LESS_ENABLE | | 
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| 388 | PORT_ALPM_CTL_MAX_PHY_SWING_SETUP(15) | | 
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| 389 | PORT_ALPM_CTL_MAX_PHY_SWING_HOLD(0) | | 
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| 390 | PORT_ALPM_CTL_SILENCE_PERIOD( | 
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| 391 | intel_dp->alpm_parameters.silence_period_sym_clocks); | 
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| 392 | lfps_ctl_val = PORT_ALPM_LFPS_CTL_LFPS_CYCLE_COUNT(LFPS_CYCLE_COUNT) | | 
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| 393 | PORT_ALPM_LFPS_CTL_LFPS_HALF_CYCLE_DURATION( | 
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| 394 | intel_dp->alpm_parameters.lfps_half_cycle_num_of_syms) | | 
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| 395 | PORT_ALPM_LFPS_CTL_FIRST_LFPS_HALF_CYCLE_DURATION( | 
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| 396 | intel_dp->alpm_parameters.lfps_half_cycle_num_of_syms) | | 
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| 397 | PORT_ALPM_LFPS_CTL_LAST_LFPS_HALF_CYCLE_DURATION( | 
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| 398 | intel_dp->alpm_parameters.lfps_half_cycle_num_of_syms); | 
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| 399 | } | 
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| 400 |  | 
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| 401 | intel_de_write(display, PORT_ALPM_CTL(port), val: alpm_ctl_val); | 
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| 402 |  | 
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| 403 | intel_de_write(display, PORT_ALPM_LFPS_CTL(port), val: lfps_ctl_val); | 
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| 404 | } | 
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| 405 |  | 
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| 406 | void intel_alpm_pre_plane_update(struct intel_atomic_state *state, | 
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| 407 | struct intel_crtc *crtc) | 
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| 408 | { | 
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| 409 | struct intel_display *display = to_intel_display(state); | 
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| 410 | const struct intel_crtc_state *crtc_state = | 
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| 411 | intel_atomic_get_new_crtc_state(state, crtc); | 
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| 412 | const struct intel_crtc_state *old_crtc_state = | 
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| 413 | intel_atomic_get_old_crtc_state(state, crtc); | 
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| 414 | enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; | 
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| 415 | struct intel_encoder *encoder; | 
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| 416 |  | 
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| 417 | if (DISPLAY_VER(display) < 20) | 
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| 418 | return; | 
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| 419 |  | 
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| 420 | if (crtc_state->has_lobf || crtc_state->has_lobf == old_crtc_state->has_lobf) | 
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| 421 | return; | 
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| 422 |  | 
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| 423 | for_each_intel_encoder_mask(display->drm, encoder, | 
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| 424 | crtc_state->uapi.encoder_mask) { | 
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| 425 | struct intel_dp *intel_dp; | 
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| 426 |  | 
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| 427 | if (!intel_encoder_is_dp(encoder)) | 
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| 428 | continue; | 
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| 429 |  | 
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| 430 | intel_dp = enc_to_intel_dp(encoder); | 
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| 431 |  | 
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| 432 | if (!intel_dp_is_edp(intel_dp)) | 
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| 433 | continue; | 
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| 434 |  | 
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| 435 | if (old_crtc_state->has_lobf) { | 
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| 436 | mutex_lock(lock: &intel_dp->alpm_parameters.lock); | 
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| 437 | intel_de_write(display, ALPM_CTL(display, cpu_transcoder), val: 0); | 
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| 438 | drm_dbg_kms(display->drm, "Link off between frames (LOBF) disabled\n"); | 
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| 439 | mutex_unlock(lock: &intel_dp->alpm_parameters.lock); | 
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| 440 | } | 
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| 441 | } | 
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| 442 | } | 
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| 443 |  | 
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| 444 | void intel_alpm_enable_sink(struct intel_dp *intel_dp, | 
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| 445 | const struct intel_crtc_state *crtc_state) | 
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| 446 | { | 
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| 447 | u8 val; | 
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| 448 |  | 
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| 449 | if (!intel_psr_needs_alpm(intel_dp, crtc_state) && !crtc_state->has_lobf) | 
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| 450 | return; | 
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| 451 |  | 
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| 452 | val = DP_ALPM_ENABLE | DP_ALPM_LOCK_ERROR_IRQ_HPD_ENABLE; | 
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| 453 |  | 
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| 454 | if (crtc_state->has_panel_replay || (crtc_state->has_lobf && | 
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| 455 | intel_alpm_aux_less_wake_supported(intel_dp))) | 
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| 456 | val |= DP_ALPM_MODE_AUX_LESS; | 
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| 457 |  | 
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| 458 | drm_dp_dpcd_writeb(aux: &intel_dp->aux, DP_RECEIVER_ALPM_CONFIG, value: val); | 
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| 459 | } | 
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| 460 |  | 
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| 461 | void intel_alpm_post_plane_update(struct intel_atomic_state *state, | 
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| 462 | struct intel_crtc *crtc) | 
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| 463 | { | 
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| 464 | struct intel_display *display = to_intel_display(state); | 
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| 465 | const struct intel_crtc_state *crtc_state = | 
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| 466 | intel_atomic_get_new_crtc_state(state, crtc); | 
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| 467 | const struct intel_crtc_state *old_crtc_state = | 
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| 468 | intel_atomic_get_old_crtc_state(state, crtc); | 
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| 469 | struct intel_encoder *encoder; | 
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| 470 |  | 
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| 471 | if (crtc_state->has_psr || !crtc_state->has_lobf || | 
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| 472 | crtc_state->has_lobf == old_crtc_state->has_lobf) | 
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| 473 | return; | 
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| 474 |  | 
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| 475 | for_each_intel_encoder_mask(display->drm, encoder, | 
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| 476 | crtc_state->uapi.encoder_mask) { | 
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| 477 | struct intel_dp *intel_dp; | 
|---|
| 478 |  | 
|---|
| 479 | if (!intel_encoder_is_dp(encoder)) | 
|---|
| 480 | continue; | 
|---|
| 481 |  | 
|---|
| 482 | intel_dp = enc_to_intel_dp(encoder); | 
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| 483 |  | 
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| 484 | if (intel_dp_is_edp(intel_dp)) { | 
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| 485 | intel_alpm_enable_sink(intel_dp, crtc_state); | 
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| 486 | intel_alpm_configure(intel_dp, crtc_state); | 
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| 487 | } | 
|---|
| 488 | } | 
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| 489 | } | 
|---|
| 490 |  | 
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| 491 | static int i915_edp_lobf_info_show(struct seq_file *m, void *data) | 
|---|
| 492 | { | 
|---|
| 493 | struct intel_connector *connector = m->private; | 
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| 494 | struct intel_display *display = to_intel_display(connector); | 
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| 495 | struct drm_crtc *crtc; | 
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| 496 | struct intel_crtc_state *crtc_state; | 
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| 497 | enum transcoder cpu_transcoder; | 
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| 498 | u32 alpm_ctl; | 
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| 499 | int ret; | 
|---|
| 500 |  | 
|---|
| 501 | ret = drm_modeset_lock_single_interruptible(lock: &display->drm->mode_config.connection_mutex); | 
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| 502 | if (ret) | 
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| 503 | return ret; | 
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| 504 |  | 
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| 505 | crtc = connector->base.state->crtc; | 
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| 506 | if (connector->base.status != connector_status_connected || !crtc) { | 
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| 507 | ret = -ENODEV; | 
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| 508 | goto out; | 
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| 509 | } | 
|---|
| 510 |  | 
|---|
| 511 | crtc_state = to_intel_crtc_state(crtc->state); | 
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| 512 | cpu_transcoder = crtc_state->cpu_transcoder; | 
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| 513 | alpm_ctl = intel_de_read(display, ALPM_CTL(display, cpu_transcoder)); | 
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| 514 | seq_printf(m, fmt: "LOBF status: %s\n", str_enabled_disabled(v: alpm_ctl & ALPM_CTL_LOBF_ENABLE)); | 
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| 515 | seq_printf(m, fmt: "Aux-wake alpm status: %s\n", | 
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| 516 | str_enabled_disabled(v: !(alpm_ctl & ALPM_CTL_ALPM_AUX_LESS_ENABLE))); | 
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| 517 | seq_printf(m, fmt: "Aux-less alpm status: %s\n", | 
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| 518 | str_enabled_disabled(v: alpm_ctl & ALPM_CTL_ALPM_AUX_LESS_ENABLE)); | 
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| 519 | out: | 
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| 520 | drm_modeset_unlock(lock: &display->drm->mode_config.connection_mutex); | 
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| 521 |  | 
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| 522 | return ret; | 
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| 523 | } | 
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| 524 |  | 
|---|
| 525 | DEFINE_SHOW_ATTRIBUTE(i915_edp_lobf_info); | 
|---|
| 526 |  | 
|---|
| 527 | static int | 
|---|
| 528 | i915_edp_lobf_debug_get(void *data, u64 *val) | 
|---|
| 529 | { | 
|---|
| 530 | struct intel_connector *connector = data; | 
|---|
| 531 | struct intel_dp *intel_dp = enc_to_intel_dp(encoder: connector->encoder); | 
|---|
| 532 |  | 
|---|
| 533 | *val = intel_dp->alpm_parameters.lobf_disable_debug; | 
|---|
| 534 |  | 
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| 535 | return 0; | 
|---|
| 536 | } | 
|---|
| 537 |  | 
|---|
| 538 | static int | 
|---|
| 539 | i915_edp_lobf_debug_set(void *data, u64 val) | 
|---|
| 540 | { | 
|---|
| 541 | struct intel_connector *connector = data; | 
|---|
| 542 | struct intel_dp *intel_dp = enc_to_intel_dp(encoder: connector->encoder); | 
|---|
| 543 |  | 
|---|
| 544 | intel_dp->alpm_parameters.lobf_disable_debug = val; | 
|---|
| 545 |  | 
|---|
| 546 | return 0; | 
|---|
| 547 | } | 
|---|
| 548 |  | 
|---|
| 549 | DEFINE_SIMPLE_ATTRIBUTE(i915_edp_lobf_debug_fops, | 
|---|
| 550 | i915_edp_lobf_debug_get, i915_edp_lobf_debug_set, | 
|---|
| 551 | "%llu\n"); | 
|---|
| 552 |  | 
|---|
| 553 | void intel_alpm_lobf_debugfs_add(struct intel_connector *connector) | 
|---|
| 554 | { | 
|---|
| 555 | struct intel_display *display = to_intel_display(connector); | 
|---|
| 556 | struct dentry *root = connector->base.debugfs_entry; | 
|---|
| 557 |  | 
|---|
| 558 | if (DISPLAY_VER(display) < 20 || | 
|---|
| 559 | connector->base.connector_type != DRM_MODE_CONNECTOR_eDP) | 
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| 560 | return; | 
|---|
| 561 |  | 
|---|
| 562 | debugfs_create_file( "i915_edp_lobf_debug", 0644, root, | 
|---|
| 563 | connector, &i915_edp_lobf_debug_fops); | 
|---|
| 564 |  | 
|---|
| 565 | debugfs_create_file( "i915_edp_lobf_info", 0444, root, | 
|---|
| 566 | connector, &i915_edp_lobf_info_fops); | 
|---|
| 567 | } | 
|---|
| 568 |  | 
|---|
| 569 | void intel_alpm_disable(struct intel_dp *intel_dp) | 
|---|
| 570 | { | 
|---|
| 571 | struct intel_display *display = to_intel_display(intel_dp); | 
|---|
| 572 | enum transcoder cpu_transcoder = intel_dp->alpm_parameters.transcoder; | 
|---|
| 573 |  | 
|---|
| 574 | if (DISPLAY_VER(display) < 20 || !intel_dp->alpm_dpcd) | 
|---|
| 575 | return; | 
|---|
| 576 |  | 
|---|
| 577 | mutex_lock(lock: &intel_dp->alpm_parameters.lock); | 
|---|
| 578 |  | 
|---|
| 579 | intel_de_rmw(display, ALPM_CTL(display, cpu_transcoder), | 
|---|
| 580 | ALPM_CTL_ALPM_ENABLE | ALPM_CTL_LOBF_ENABLE | | 
|---|
| 581 | ALPM_CTL_ALPM_AUX_LESS_ENABLE, set: 0); | 
|---|
| 582 |  | 
|---|
| 583 | intel_de_rmw(display, | 
|---|
| 584 | PORT_ALPM_CTL(cpu_transcoder), | 
|---|
| 585 | PORT_ALPM_CTL_ALPM_AUX_LESS_ENABLE, set: 0); | 
|---|
| 586 |  | 
|---|
| 587 | drm_dbg_kms(display->drm, "Disabling ALPM\n"); | 
|---|
| 588 | mutex_unlock(lock: &intel_dp->alpm_parameters.lock); | 
|---|
| 589 | } | 
|---|
| 590 |  | 
|---|
| 591 | bool intel_alpm_get_error(struct intel_dp *intel_dp) | 
|---|
| 592 | { | 
|---|
| 593 | struct intel_display *display = to_intel_display(intel_dp); | 
|---|
| 594 | struct drm_dp_aux *aux = &intel_dp->aux; | 
|---|
| 595 | u8 val; | 
|---|
| 596 | int r; | 
|---|
| 597 |  | 
|---|
| 598 | r = drm_dp_dpcd_readb(aux, DP_RECEIVER_ALPM_STATUS, valuep: &val); | 
|---|
| 599 | if (r != 1) { | 
|---|
| 600 | drm_err(display->drm, "Error reading ALPM status\n"); | 
|---|
| 601 | return true; | 
|---|
| 602 | } | 
|---|
| 603 |  | 
|---|
| 604 | if (val & DP_ALPM_LOCK_TIMEOUT_ERROR) { | 
|---|
| 605 | drm_dbg_kms(display->drm, "ALPM lock timeout error\n"); | 
|---|
| 606 |  | 
|---|
| 607 | /* Clearing error */ | 
|---|
| 608 | drm_dp_dpcd_writeb(aux, DP_RECEIVER_ALPM_STATUS, value: val); | 
|---|
| 609 | return true; | 
|---|
| 610 | } | 
|---|
| 611 |  | 
|---|
| 612 | return false; | 
|---|
| 613 | } | 
|---|
| 614 |  | 
|---|