[PATCH v5 08/19] drm/i915/psr: Unify panel replay enable/disable sink

Manna, Animesh animesh.manna at intel.com
Fri Apr 5 11:06:05 UTC 2024



> -----Original Message-----
> From: Hogander, Jouni <jouni.hogander at intel.com>
> Sent: Wednesday, April 3, 2024 2:30 PM
> To: intel-gfx at lists.freedesktop.org
> Cc: Manna, Animesh <animesh.manna at intel.com>; Hogander, Jouni
> <jouni.hogander at intel.com>
> Subject: [PATCH v5 08/19] drm/i915/psr: Unify panel replay enable/disable
> sink
> 
> Unify enabling and disabling of psr/panel replay for a sink. Modify
> intel_psr_enable_sink accordingly and use it for both cases.
> 
> v3:
>   - move psr2_su_region_et_valid to be check for PSR2 only
> v2:
>   - enable panel replay for sink before link training
>   - write ALPM_CONFIG only for PSR
>   - add DP_PSR_CRC_VERIFICATION only for PSR
>   - take care of disable sink as well
> 
> Signed-off-by: Jouni Högander <jouni.hogander at intel.com>

Reviewed-by: Animesh Manna <animesh.manna at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c | 11 ++---
> drivers/gpu/drm/i915/display/intel_psr.c | 60 +++++++++++++++++-------
> drivers/gpu/drm/i915/display/intel_psr.h |  2 +
>  3 files changed, 50 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index a3d3d4942eb1..4cdc218653b1 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -2809,15 +2809,14 @@ static void intel_ddi_pre_enable_dp(struct
> intel_atomic_state *state,
>  				    const struct drm_connector_state
> *conn_state)  {
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> -	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> 
> -	if (HAS_DP20(dev_priv)) {
> +	if (HAS_DP20(dev_priv))
>  		intel_dp_128b132b_sdp_crc16(enc_to_intel_dp(encoder),
>  					    crtc_state);
> -		if (crtc_state->has_panel_replay)
> -			drm_dp_dpcd_writeb(&intel_dp->aux,
> PANEL_REPLAY_CONFIG,
> -					   DP_PANEL_REPLAY_ENABLE);
> -	}
> +
> +	/* Panel replay has to be enabled in sink dpcd before link training. */
> +	if (crtc_state->has_panel_replay)
> +		intel_psr_enable_sink(enc_to_intel_dp(encoder), crtc_state);
> 
>  	if (DISPLAY_VER(dev_priv) >= 14)
>  		mtl_ddi_pre_enable_dp(state, encoder, crtc_state,
> conn_state); diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index b7538a4405b8..4355fb02d8fd 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -638,40 +638,59 @@ static bool psr2_su_region_et_valid(struct intel_dp
> *intel_dp)
>  	return false;
>  }
> 
> -static void intel_psr_enable_sink(struct intel_dp *intel_dp)
> +static unsigned int intel_psr_get_enable_sink_offset(struct intel_dp
> +*intel_dp) {
> +	return intel_dp->psr.panel_replay_enabled ?
> +		PANEL_REPLAY_CONFIG : DP_PSR_EN_CFG;
> +}
> +
> +/*
> + * Note: Most of the bits are same in PANEL_REPLAY_CONFIG and
> +DP_PSR_EN_CFG. We
> + * are relying on PSR definitions on these "common" bits.
> + */
> +void intel_psr_enable_sink(struct intel_dp *intel_dp,
> +			   const struct intel_crtc_state *crtc_state)
>  {
>  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
>  	u8 dpcd_val = DP_PSR_ENABLE;
> 
> -	if (intel_dp->psr.panel_replay_enabled)
> -		return;
> -
> -	if (intel_dp->psr.psr2_enabled) {
> +	if (crtc_state->has_psr2) {
>  		/* Enable ALPM at sink for psr2 */
> -		drm_dp_dpcd_writeb(&intel_dp->aux,
> DP_RECEIVER_ALPM_CONFIG,
> -				   DP_ALPM_ENABLE |
> -
> DP_ALPM_LOCK_ERROR_IRQ_HPD_ENABLE);
> +		if (!crtc_state->has_panel_replay) {
> +			drm_dp_dpcd_writeb(&intel_dp->aux,
> +					   DP_RECEIVER_ALPM_CONFIG,
> +					   DP_ALPM_ENABLE |
> +
> DP_ALPM_LOCK_ERROR_IRQ_HPD_ENABLE);
> +
> +			if (psr2_su_region_et_valid(intel_dp))
> +				dpcd_val |=
> DP_PSR_ENABLE_SU_REGION_ET;
> +		}
> 
>  		dpcd_val |= DP_PSR_ENABLE_PSR2 |
> DP_PSR_IRQ_HPD_WITH_CRC_ERRORS;
> -		if (psr2_su_region_et_valid(intel_dp))
> -			dpcd_val |= DP_PSR_ENABLE_SU_REGION_ET;
>  	} else {
>  		if (intel_dp->psr.link_standby)
>  			dpcd_val |= DP_PSR_MAIN_LINK_ACTIVE;
> 
> -		if (DISPLAY_VER(dev_priv) >= 8)
> +		if (!crtc_state->has_panel_replay && DISPLAY_VER(dev_priv)
> >= 8)
>  			dpcd_val |= DP_PSR_CRC_VERIFICATION;
>  	}
> 
> -	if (intel_dp->psr.req_psr2_sdp_prior_scanline)
> +	if (crtc_state->has_panel_replay)
> +		dpcd_val |=
> DP_PANEL_REPLAY_UNRECOVERABLE_ERROR_EN |
> +			DP_PANEL_REPLAY_RFB_STORAGE_ERROR_EN;
> +
> +	if (crtc_state->req_psr2_sdp_prior_scanline)
>  		dpcd_val |= DP_PSR_SU_REGION_SCANLINE_CAPTURE;
> 
>  	if (intel_dp->psr.entry_setup_frames > 0)
>  		dpcd_val |= DP_PSR_FRAME_CAPTURE;
> 
> -	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, dpcd_val);
> +	drm_dp_dpcd_writeb(&intel_dp->aux,
> +			   intel_psr_get_enable_sink_offset(intel_dp),
> +			   dpcd_val);
> 
> -	drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> +	if (intel_dp_is_edp(intel_dp))
> +		drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
>  }
> 
>  static u32 intel_psr1_get_tp_time(struct intel_dp *intel_dp) @@ -1955,12
> +1974,17 @@ static void intel_psr_enable_locked(struct intel_dp *intel_dp,
>  	} else {
>  		drm_dbg_kms(&dev_priv->drm, "Enabling PSR%s\n",
>  			    intel_dp->psr.psr2_enabled ? "2" : "1");
> +
> +		/*
> +		 * Panel replay has to be enabled before link training: doing it
> +		 * only for PSR here.
> +		 */
> +		intel_psr_enable_sink(intel_dp, crtc_state);
>  	}
> 
>  	if (intel_dp_is_edp(intel_dp))
>  		intel_snps_phy_update_psr_power_state(&dig_port->base,
> true);
> 
> -	intel_psr_enable_sink(intel_dp);
>  	intel_psr_enable_source(intel_dp, crtc_state);
>  	intel_dp->psr.enabled = true;
>  	intel_dp->psr.paused = false;
> @@ -2078,9 +2102,11 @@ static void intel_psr_disable_locked(struct
> intel_dp *intel_dp)
>  	}
> 
>  	/* Disable PSR on Sink */
> -	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
> +	drm_dp_dpcd_writeb(&intel_dp->aux,
> +			   intel_psr_get_enable_sink_offset(intel_dp), 0);
> 
> -	if (intel_dp->psr.psr2_enabled)
> +	if (!intel_dp->psr.panel_replay_enabled &&
> +	    intel_dp->psr.psr2_enabled)
>  		drm_dp_dpcd_writeb(&intel_dp->aux,
> DP_RECEIVER_ALPM_CONFIG, 0);
> 
>  	intel_dp->psr.enabled = false;
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.h
> b/drivers/gpu/drm/i915/display/intel_psr.h
> index cde781df84d5..2537dcb8765c 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.h
> +++ b/drivers/gpu/drm/i915/display/intel_psr.h
> @@ -23,6 +23,8 @@ struct intel_plane_state;
> 
>  bool intel_encoder_can_psr(struct intel_encoder *encoder);  void
> intel_psr_init_dpcd(struct intel_dp *intel_dp);
> +void intel_psr_enable_sink(struct intel_dp *intel_dp,
> +			   const struct intel_crtc_state *crtc_state);
>  void intel_psr_pre_plane_update(struct intel_atomic_state *state,
>  				struct intel_crtc *crtc);
>  void intel_psr_post_plane_update(struct intel_atomic_state *state,
> --
> 2.34.1



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