> -----Original Message-----
> From: Hogander, Jouni <jouni.hogan...@intel.com>
> Sent: Wednesday, March 6, 2024 4:15 PM
> To: intel-gfx@lists.freedesktop.org
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>; Manna, Animesh
> <animesh.ma...@intel.com>; Murthy, Arun R <arun.r.mur...@intel.com>;
> Hogander, Jouni <jouni.hogan...@intel.com>
> Subject: [PATCH v3 5/6] drm/i915/psr: Enable ALPM for eDP Panel replay
>
> Enable ALPM AUX-Less for Panel Replay eDP. Also write all calculated AUX-
> Less configuration values accordingly.
>
> Bspec: 71477
>
> v3:
> - do not use alpm_ctl as uninitialized variable
> v2:
> - do not set AUX-Wake related bits for AUX-Less case
> - drop switch to active latency
> - add SLEEP_HOLD_TIME_50_SYMBOLS
> - add PORT_ALPM_CTL_MAX_PHY_SWING_HOLD
>
> Signed-off-by: Jouni Högander <jouni.hogan...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_psr.c | 42 +++++++++++++++++++++---
> 1 file changed, 38 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index 738ea623a395..4cd2bad5241f 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1697,14 +1697,39 @@ static void lnl_alpm_configure(struct intel_dp
> *intel_dp)
> struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> enum transcoder cpu_transcoder = intel_dp->psr.transcoder;
> struct intel_psr *psr = &intel_dp->psr;
> + u32 alpm_ctl;
>
> if (DISPLAY_VER(dev_priv) < 20)
> return;
>
> - intel_de_write(dev_priv, ALPM_CTL(cpu_transcoder),
> - ALPM_CTL_EXTENDED_FAST_WAKE_ENABLE |
> - ALPM_CTL_ALPM_ENTRY_CHECK(psr-
> >alpm_parameters.check_entry_lines) |
> - ALPM_CTL_EXTENDED_FAST_WAKE_TIME(psr-
> >alpm_parameters.fast_wake_lines));
> + if (intel_dp->psr.panel_replay_enabled &&
> intel_dp_is_edp(intel_dp)) {
> + alpm_ctl = ALPM_CTL_ALPM_ENABLE |
> + ALPM_CTL_ALPM_AUX_LESS_ENABLE |
> +
> ALPM_CTL_AUX_LESS_SLEEP_HOLD_TIME_50_SYMBOLS;
> +
> + intel_de_write(dev_priv, PORT_ALPM_CTL(cpu_transcoder),
> + PORT_ALPM_CTL_ALPM_AUX_LESS_ENABLE |
Good to add code-comments why aux-less alpm is enabled without checking panel
capability.
Same for below wherever we are setting bit for aux-less alpm.
Regards,
Animesh
> + PORT_ALPM_CTL_MAX_PHY_SWING_SETUP(15) |
> + PORT_ALPM_CTL_MAX_PHY_SWING_HOLD(0) |
> + PORT_ALPM_CTL_SILENCE_PERIOD(
> + psr-
> >alpm_parameters.silence_period_sym_clocks));
> +
> + intel_de_write(dev_priv,
> PORT_ALPM_LFPS_CTL(cpu_transcoder),
> + PORT_ALPM_LFPS_CTL_LFPS_CYCLE_COUNT(10) |
> +
> PORT_ALPM_LFPS_CTL_LFPS_HALF_CYCLE_DURATION(
> + psr-
> >alpm_parameters.lfps_half_cycle_num_of_syms) |
> +
> PORT_ALPM_LFPS_CTL_FIRST_LFPS_HALF_CYCLE_DURATION(
> + psr-
> >alpm_parameters.lfps_half_cycle_num_of_syms) |
> +
> PORT_ALPM_LFPS_CTL_LAST_LFPS_HALF_CYCLE_DURATION(
> + psr-
> >alpm_parameters.lfps_half_cycle_num_of_syms));
> + } else {
> + alpm_ctl = ALPM_CTL_EXTENDED_FAST_WAKE_ENABLE |
> + ALPM_CTL_EXTENDED_FAST_WAKE_TIME(psr-
> >alpm_parameters.fast_wake_lines);
> + }
> +
> + alpm_ctl |=
> +ALPM_CTL_ALPM_ENTRY_CHECK(psr-
> >alpm_parameters.check_entry_lines);
> +
> + intel_de_write(dev_priv, ALPM_CTL(cpu_transcoder), alpm_ctl);
> }
>
> static void intel_psr_enable_source(struct intel_dp *intel_dp, @@ -1975,6
> +2000,15 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
>
> intel_snps_phy_update_psr_power_state(dev_priv, phy, false);
>
> + if (intel_dp->psr.panel_replay_enabled &&
> intel_dp_is_edp(intel_dp)) {
> + intel_de_rmw(dev_priv, ALPM_CTL(cpu_transcoder),
> + ALPM_CTL_ALPM_ENABLE |
> + ALPM_CTL_ALPM_AUX_LESS_ENABLE, 0);
> +
> + intel_de_rmw(dev_priv, PORT_ALPM_CTL(cpu_transcoder),
> + PORT_ALPM_CTL_ALPM_AUX_LESS_ENABLE, 0);
> + }
> +
> /* Disable PSR on Sink */
> drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
>
> --
> 2.34.1
