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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://lore.kernel.org/r/20250829053929.3585636-5-jouni.hogander@intel.com
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-7
+5
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drivers/gpu/drm/i915/display/intel_alpm.c
+5
-7
drivers/gpu/drm/i915/display/intel_alpm.c
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* tML_PHY_LOCK = TPS4 Length * ( 10 / (Link Rate in MHz) )
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* TPS4 Length = 252 Symbols
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*/
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static int _lnl_compute_aux_less_wake_time(int port_clock)
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static int _lnl_compute_aux_less_wake_time(const struct intel_crtc_state *crtc_state)
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{
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int tphy2_p2_to_p0 = 12 * 1000;
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int tlfps_period_max = 800;
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int tsilence_max = 180;
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int t1 = 50 * 1000;
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int tps4 = 252;
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/* port_clock is link rate in 10kbit/s units */
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int tml_phy_lock = 1000 * 1000 * tps4 / port_clock;
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int tml_phy_lock = 1000 * 1000 * tps4 / crtc_state->port_clock;
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int num_ml_phy_lock = 7 + DIV_ROUND_UP(6500, tml_phy_lock) + 1;
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int t2 = num_ml_phy_lock * tml_phy_lock;
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int tcds = 1 * t2;
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return DIV_ROUND_UP(tphy2_p2_to_p0 + tlfps_period_max + tsilence_max +
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t1 + tcds, 1000);
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return DIV_ROUND_UP(tphy2_p2_to_p0 + get_lfps_cycle_time(crtc_state) +
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SILENCE_PERIOD_TIME + t1 + tcds, 1000);
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}
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static int
···
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lfps_half_cycle;
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aux_less_wake_time =
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_lnl_compute_aux_less_wake_time(crtc_state->port_clock);
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_lnl_compute_aux_less_wake_time(crtc_state);
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aux_less_wake_lines = intel_usecs_to_scanlines(&crtc_state->hw.adjusted_mode,
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aux_less_wake_time);
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silence_period = get_silence_period_symbols(crtc_state);