> -----Original Message----- > From: Hogander, Jouni <[email protected]> > Sent: Friday, March 15, 2024 1:32 PM > To: [email protected] > Cc: Ville Syrjälä <[email protected]>; Manna, Animesh > <[email protected]>; Murthy, Arun R <[email protected]>; > Hogander, Jouni <[email protected]> > Subject: [PATCH v4 4/5] 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 > > v4: > - add comment explaining why AUX less is enabled on eDP panel replay > without any extra checks > 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 <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_psr.c | 47 ++++++++++++++++++++++-- > 1 file changed, 43 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c > b/drivers/gpu/drm/i915/display/intel_psr.c > index 9429c5002986..05b30dc63b3d 100644 > --- a/drivers/gpu/drm/i915/display/intel_psr.c > +++ b/drivers/gpu/drm/i915/display/intel_psr.c > @@ -1721,14 +1721,43 @@ 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)); > + /* > + * Panel Replay on eDP is always using ALPM aux less. I.e. no need to > + * check panel support at this point. > + */ > + 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 | > + 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, @@ -1999,6 > +2028,16 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp) > > intel_snps_phy_update_psr_power_state(dev_priv, phy, false); > > + /* Panel Replay on eDP is always using ALPM aux less. */ > + 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); > + }
This patch only enable source for aux-less alpm. Good to modify the commit title mentioning the same or else a 'TODO:' comment can be added if sink support enabling is planned in a separate patch. Regards, Animesh > + > /* Disable PSR on Sink */ > drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0); > > -- > 2.34.1
