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drm/i915/alpm: Calculate silence period

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Calculate silence period instead of hardcoding it in switch case.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://lore.kernel.org/r/20250829053929.3585636-2-jouni.hogander@intel.com
This commit is contained in:
Jouni Högander 2025-08-29 08:39:25 +03:00
parent f7e60f1570
commit 3b5b2567f8
1 changed files with 17 additions and 20 deletions
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37
drivers/gpu/drm/i915/display/intel_alpm.c
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@ -16,6 +16,12 @@
#include "intel_psr.h"
#include "intel_psr_regs.h"
#define SILENCE_PERIOD_MIN_TIME 80
#define SILENCE_PERIOD_MAX_TIME 180
#define SILENCE_PERIOD_TIME (SILENCE_PERIOD_MIN_TIME + \
(SILENCE_PERIOD_MAX_TIME - \
SILENCE_PERIOD_MIN_TIME) / 2)
bool intel_alpm_aux_wake_supported(struct intel_dp *intel_dp)
{
return intel_dp->alpm_dpcd & DP_ALPM_CAP;
@ -44,11 +50,15 @@ void intel_alpm_init(struct intel_dp *intel_dp)
mutex_init(&intel_dp->alpm_parameters.lock);
}
static int get_silence_period_symbols(const struct intel_crtc_state *crtc_state)
{
return SILENCE_PERIOD_TIME * intel_dp_link_symbol_clock(crtc_state->port_clock) /
1000 / 1000;
}
/*
* See Bspec: 71632 for the table
*
* Silence_period = tSilence,Min + ((tSilence,Max - tSilence,Min) / 2)
*
* Half cycle duration:
*
* Link rates 1.62 - 4.32 and tLFPS_Cycle = 70 ns
@ -60,53 +70,41 @@ void intel_alpm_init(struct intel_dp *intel_dp)
* FLOOR( LFPS Period in Symbol clocks /
* (2 * PORT_ALPM_LFPS_CTL[ LFPS Cycle Count ]) )
*/
static bool _lnl_get_silence_period_and_lfps_half_cycle(int link_rate,
int *silence_period,
int *lfps_half_cycle)
static bool _lnl_get_lfps_half_cycle(int link_rate, int *lfps_half_cycle)
{
switch (link_rate) {
case 162000:
*silence_period = 20;
*lfps_half_cycle = 5;
break;
case 216000:
*silence_period = 27;
*lfps_half_cycle = 7;
break;
case 243000:
*silence_period = 31;
*lfps_half_cycle = 8;
break;
case 270000:
*silence_period = 34;
*lfps_half_cycle = 9;
break;
case 324000:
*silence_period = 41;
*lfps_half_cycle = 11;
break;
case 432000:
*silence_period = 56;
*lfps_half_cycle = 15;
break;
case 540000:
*silence_period = 69;
*lfps_half_cycle = 12;
break;
case 648000:
*silence_period = 84;
*lfps_half_cycle = 15;
break;
case 675000:
*silence_period = 87;
*lfps_half_cycle = 15;
break;
case 810000:
*silence_period = 104;
*lfps_half_cycle = 19;
break;
default:
*silence_period = *lfps_half_cycle = -1;
*lfps_half_cycle = -1;
return false;
}
return true;
@ -160,10 +158,9 @@ _lnl_compute_aux_less_alpm_params(struct intel_dp *intel_dp,
_lnl_compute_aux_less_wake_time(crtc_state->port_clock);
aux_less_wake_lines = intel_usecs_to_scanlines(&crtc_state->hw.adjusted_mode,
aux_less_wake_time);
if (!_lnl_get_silence_period_and_lfps_half_cycle(crtc_state->port_clock,
&silence_period,
&lfps_half_cycle))
silence_period = get_silence_period_symbols(crtc_state);
if (!_lnl_get_lfps_half_cycle(crtc_state->port_clock,
&lfps_half_cycle))
return false;
if (aux_less_wake_lines > ALPM_CTL_AUX_LESS_WAKE_TIME_MASK ||