Re: [PATCH v2] drm/i915: Start tracking PSR state in crtc state

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Oct 12, 2017 at 11:11:45AM -0700, Rodrigo Vivi wrote:
> On Thu, Oct 12, 2017 at 01:28:43PM +0000, Jani Nikula wrote:
> > On Thu, 12 Oct 2017, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> > > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > >
> > > Add the minimal amount of PSR tracking into the crtc state. This allows
> > > precomputing the possibility of using PSR correctly, and it means we can
> > > safely call the psr enable/disable functions for any DP endcoder.
> 
> good idea.
> 
> > >
> > > As a nice bonus we get rid of some more crtc->config usage, which we
> > > want to kill off eventually.
> > >
> > > v2: Fix 'goto unlock' fail in intel_psr_enable() (Jani)
> > >     Check intel_dp_is_edp() in is_edp_psr() (Jani)
> > >
> > > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > > Cc: Jani Nikula <jani.nikula@intel.com>
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > Reviewed-by: Jani Nikula <jani.nikula@intel.com>
> 
> Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Thank you both. Patch pushed to dinq.

> 
> > 
> > But I think an ack from Rodrigo might be in order.
> > 
> > There's also some follow-up to do with untangling
> > dev_priv->psr.psr2_support.
> 
> +Vathsala just in case ;)
> 
> > 
> > > ---
> > >  drivers/gpu/drm/i915/intel_dp.c  |  2 +
> > >  drivers/gpu/drm/i915/intel_drv.h |  5 +++
> > >  drivers/gpu/drm/i915/intel_psr.c | 85 +++++++++++++++++++++-------------------
> > >  3 files changed, 52 insertions(+), 40 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > > index b0f446b68f42..753404280a19 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > @@ -1832,6 +1832,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> > >  	if (!HAS_DDI(dev_priv))
> > >  		intel_dp_set_clock(encoder, pipe_config);
> > >  
> > > +	intel_psr_compute_config(intel_dp, pipe_config);
> > > +
> > >  	return true;
> > >  }
> > >  
> > > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > > index b87946dcc53f..d61985f93d40 100644
> > > --- a/drivers/gpu/drm/i915/intel_drv.h
> > > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > > @@ -718,6 +718,9 @@ struct intel_crtc_state {
> > >  	struct intel_link_m_n dp_m2_n2;
> > >  	bool has_drrs;
> > >  
> > > +	bool has_psr;
> > > +	bool has_psr2;
> > > +
> > >  	/*
> > >  	 * Frequence the dpll for the port should run at. Differs from the
> > >  	 * adjusted dotclock e.g. for DP or 12bpc hdmi mode. This is also
> > > @@ -1764,6 +1767,8 @@ void intel_psr_flush(struct drm_i915_private *dev_priv,
> > >  void intel_psr_init(struct drm_i915_private *dev_priv);
> > >  void intel_psr_single_frame_update(struct drm_i915_private *dev_priv,
> > >  				   unsigned frontbuffer_bits);
> > > +void intel_psr_compute_config(struct intel_dp *intel_dp,
> > > +			      struct intel_crtc_state *crtc_state);
> > >  
> > >  /* intel_runtime_pm.c */
> > >  int intel_power_domains_init(struct drm_i915_private *);
> > > diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> > > index 5419cda83ba8..93b177cc4cbf 100644
> > > --- a/drivers/gpu/drm/i915/intel_psr.c
> > > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > > @@ -58,6 +58,9 @@
> > >  
> > >  static bool is_edp_psr(struct intel_dp *intel_dp)
> > >  {
> > > +	if (!intel_dp_is_edp(intel_dp))
> > > +		return false;
> > > +
> > >  	return intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED;
> > >  }
> > >  
> > > @@ -376,22 +379,25 @@ static void hsw_psr_activate(struct intel_dp *intel_dp)
> > >  		hsw_activate_psr1(intel_dp);
> > >  }
> > >  
> > > -static bool intel_psr_match_conditions(struct intel_dp *intel_dp)
> > > +void intel_psr_compute_config(struct intel_dp *intel_dp,
> > > +			      struct intel_crtc_state *crtc_state)
> > >  {
> > >  	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > > -	struct drm_device *dev = dig_port->base.base.dev;
> > > -	struct drm_i915_private *dev_priv = to_i915(dev);
> > > -	struct drm_crtc *crtc = dig_port->base.base.crtc;
> > > -	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> > > +	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > >  	const struct drm_display_mode *adjusted_mode =
> > > -		&intel_crtc->config->base.adjusted_mode;
> > > +		&crtc_state->base.adjusted_mode;
> > >  	int psr_setup_time;
> > >  
> > > -	lockdep_assert_held(&dev_priv->psr.lock);
> > > -	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
> > > -	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
> > > +	if (!HAS_PSR(dev_priv))
> > > +		return;
> > >  
> > > -	dev_priv->psr.source_ok = false;
> > > +	if (!is_edp_psr(intel_dp))
> > > +		return;
> > > +
> > > +	if (!i915_modparams.enable_psr) {
> > > +		DRM_DEBUG_KMS("PSR disable by flag\n");
> > > +		return;
> > > +	}
> > >  
> > >  	/*
> > >  	 * HSW spec explicitly says PSR is tied to port A.
> > > @@ -402,66 +408,70 @@ static bool intel_psr_match_conditions(struct intel_dp *intel_dp)
> > >  	 */
> > >  	if (HAS_DDI(dev_priv) && dig_port->port != PORT_A) {
> > >  		DRM_DEBUG_KMS("PSR condition failed: Port not supported\n");
> > > -		return false;
> > > -	}
> > > -
> > > -	if (!i915_modparams.enable_psr) {
> > > -		DRM_DEBUG_KMS("PSR disable by flag\n");
> > > -		return false;
> > > +		return;
> > >  	}
> > >  
> > >  	if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
> > >  	    !dev_priv->psr.link_standby) {
> > >  		DRM_ERROR("PSR condition failed: Link off requested but not supported on this platform\n");
> > > -		return false;
> > > +		return;
> > >  	}
> > >  
> > >  	if (IS_HASWELL(dev_priv) &&
> > > -	    I915_READ(HSW_STEREO_3D_CTL(intel_crtc->config->cpu_transcoder)) &
> > > +	    I915_READ(HSW_STEREO_3D_CTL(crtc_state->cpu_transcoder)) &
> > >  		      S3D_ENABLE) {
> > >  		DRM_DEBUG_KMS("PSR condition failed: Stereo 3D is Enabled\n");
> > > -		return false;
> > > +		return;
> > >  	}
> > >  
> > >  	if (IS_HASWELL(dev_priv) &&
> > >  	    adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
> > >  		DRM_DEBUG_KMS("PSR condition failed: Interlaced is Enabled\n");
> > > -		return false;
> > > +		return;
> > >  	}
> > >  
> > >  	psr_setup_time = drm_dp_psr_setup_time(intel_dp->psr_dpcd);
> > >  	if (psr_setup_time < 0) {
> > >  		DRM_DEBUG_KMS("PSR condition failed: Invalid PSR setup time (0x%02x)\n",
> > >  			      intel_dp->psr_dpcd[1]);
> > > -		return false;
> > > +		return;
> > >  	}
> > >  
> > >  	if (intel_usecs_to_scanlines(adjusted_mode, psr_setup_time) >
> > >  	    adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vdisplay - 1) {
> > >  		DRM_DEBUG_KMS("PSR condition failed: PSR setup time (%d us) too long\n",
> > >  			      psr_setup_time);
> > > -		return false;
> > > +		return;
> > > +	}
> > > +
> > > +	/*
> > > +	 * FIXME psr2_support is messed up. It's both computed
> > > +	 * dynamically during PSR enable, and extracted from sink
> > > +	 * caps during eDP detection.
> > > +	 */
> 
> +Vathsala
> 
> > > +	if (!dev_priv->psr.psr2_support) {
> > > +		crtc_state->has_psr = true;
> > > +		return;
> > >  	}
> > >  
> > >  	/* PSR2 is restricted to work with panel resolutions upto 3200x2000 */
> > > -	if (dev_priv->psr.psr2_support &&
> > > -	    (intel_crtc->config->pipe_src_w > 3200 ||
> > > -	     intel_crtc->config->pipe_src_h > 2000)) {
> > > -		dev_priv->psr.psr2_support = false;
> > > -		return false;
> > > +	if (adjusted_mode->crtc_hdisplay > 3200 ||
> > > +	    adjusted_mode->crtc_vdisplay > 2000) {
> > > +		DRM_DEBUG_KMS("PSR2 disabled, panel resolution too big\n");
> > > +		return;
> > >  	}
> > >  
> > >  	/*
> > >  	 * FIXME:enable psr2 only for y-cordinate psr2 panels
> > >  	 * After gtc implementation , remove this restriction.
> > >  	 */
> > > -	if (!dev_priv->psr.y_cord_support &&  dev_priv->psr.psr2_support) {
> > > +	if (!dev_priv->psr.y_cord_support) {
> > >  		DRM_DEBUG_KMS("PSR2 disabled, panel does not support Y coordinate\n");
> > > -		return false;
> > > +		return;
> > >  	}
> > >  
> > > -	dev_priv->psr.source_ok = true;
> > > -	return true;
> > > +	crtc_state->has_psr = true;
> > > +	crtc_state->has_psr2 = true;
> > >  }
> > >  
> > >  static void intel_psr_activate(struct intel_dp *intel_dp)
> > > @@ -531,14 +541,9 @@ void intel_psr_enable(struct intel_dp *intel_dp,
> > >  	struct drm_device *dev = intel_dig_port->base.base.dev;
> > >  	struct drm_i915_private *dev_priv = to_i915(dev);
> > >  
> > > -	if (!HAS_PSR(dev_priv))
> > > +	if (!crtc_state->has_psr)
> > >  		return;
> > >  
> > > -	if (!is_edp_psr(intel_dp)) {
> > > -		DRM_DEBUG_KMS("PSR not supported by this panel\n");
> > > -		return;
> > > -	}
> > > -
> > >  	WARN_ON(dev_priv->drrs.dp);
> > >  	mutex_lock(&dev_priv->psr.lock);
> > >  	if (dev_priv->psr.enabled) {
> > > @@ -546,8 +551,8 @@ void intel_psr_enable(struct intel_dp *intel_dp,
> > >  		goto unlock;
> > >  	}
> > >  
> > > -	if (!intel_psr_match_conditions(intel_dp))
> > > -		goto unlock;
> > > +	dev_priv->psr.psr2_support = crtc_state->has_psr2;
> > > +	dev_priv->psr.source_ok = true;
> > >  
> > >  	dev_priv->psr.busy_frontbuffer_bits = 0;
> > >  
> > > @@ -668,7 +673,7 @@ void intel_psr_disable(struct intel_dp *intel_dp,
> > >  	struct drm_device *dev = intel_dig_port->base.base.dev;
> > >  	struct drm_i915_private *dev_priv = to_i915(dev);
> > >  
> > > -	if (!HAS_PSR(dev_priv))
> > > +	if (!old_crtc_state->has_psr)
> > >  		return;
> > >  
> > >  	mutex_lock(&dev_priv->psr.lock);
> > 
> > -- 
> > Jani Nikula, Intel Open Source Technology Center

-- 
Ville Syrjälä
Intel OTC
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