Re: [CI] drm/i915/cnl: New power domain for AUX IO.

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

On Mon, Feb 19, 2018 at 04:47:41PM +0200, Imre Deak wrote:
> On Fri, Feb 16, 2018 at 04:27:04PM -0800, Rodrigo Vivi wrote:
> > On Fri, Feb 16, 2018 at 03:25:55PM -0800, Dhinakaran Pandiyan wrote:
> > > PSR requires AUX IO well to be kept on and the existing AUX domain
> > > enables other wells too.
> > > 
> > 
> > Cc: Imre Deak <imre.deak@intel.com>
> > 
> > > Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/intel_display.h    |  5 +++++
> > >  drivers/gpu/drm/i915/intel_dp.c         |  6 ++++++
> > >  drivers/gpu/drm/i915/intel_drv.h        |  1 +
> > >  drivers/gpu/drm/i915/intel_psr.c        |  4 ++++
> > >  drivers/gpu/drm/i915/intel_runtime_pm.c | 15 +++++++++++++++
> > >  5 files changed, 31 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
> > > index c4042e342f50..9857b60a7e0f 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.h
> > > +++ b/drivers/gpu/drm/i915/intel_display.h
> > > @@ -175,6 +175,11 @@ enum intel_display_power_domain {
> > >  	POWER_DOMAIN_AUX_C,
> > >  	POWER_DOMAIN_AUX_D,
> > >  	POWER_DOMAIN_AUX_F,
> > > +	POWER_DOMAIN_AUX_IO_A,
> > > +	POWER_DOMAIN_AUX_IO_B,
> > > +	POWER_DOMAIN_AUX_IO_C,
> > > +	POWER_DOMAIN_AUX_IO_D,
> > > +	POWER_DOMAIN_AUX_IO_F,
> > 
> > I know that I had suggested something very similar, but looking now
> > to the code it seems a big duplication of all other aux..
> > 
> > I mean, on CNL
> > 
> > POWER_DOMAIN_AUX_{B,C,D,F} are exactly the same as
> > POWER_DOMAIN_AUX__IO_{B,C,D,F}
> > 
> > Only the AUX_IO A is different from the AUX_A because AUX_A
> > disables DMC.
> > So, question is: What about removing the AUX_A domain from DC_OFF
> > and just using AUX doamins... Well, on this case calling get/put
> > only for INTEL_GEN <= 10...
> > 
> > So, yeap, not beautiful anyways.
> > 
> > I'd like to hear from Imre what he had in mind for handling
> > AUX IOs and to know if he has any better idea for this case.
> 
> Hm, so in general (for AUX transfers) to enable AUX-A we first need to
> disable DC states _except_ if we enable AUX-A for PSR where we want
> DC5/6 to stay enabled. Nice. Also not sure why the FW/HW can't have its
> own request bit..
> 
> I don't have a better idea, but since on DDI where this matters PSR is
> tied to port A,

SKL+ (or maybe even BDW?) can do PSR on any port actually. We just don't
make use of that capability currently.

> we could have only a POWER_DOMAIN_PSR and map it to the
> AUX-A power well where it's needed.
> 
> --Imre
> 
> > 
> > >  	POWER_DOMAIN_GMBUS,
> > >  	POWER_DOMAIN_MODESET,
> > >  	POWER_DOMAIN_GT_IRQ,
> > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > > index f20b25f98e5a..aa90f6a70689 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > @@ -6280,22 +6280,28 @@ intel_dp_init_connector_port_info(struct intel_digital_port *intel_dig_port)
> > >  	switch (encoder->port) {
> > >  	case PORT_A:
> > >  		intel_dp->aux_power_domain = POWER_DOMAIN_AUX_A;
> > > +		intel_dp->aux_io_power_domain = POWER_DOMAIN_AUX_IO_A;
> > >  		break;
> > >  	case PORT_B:
> > >  		intel_dp->aux_power_domain = POWER_DOMAIN_AUX_B;
> > > +		intel_dp->aux_io_power_domain = POWER_DOMAIN_AUX_IO_B;
> > >  		break;
> > >  	case PORT_C:
> > >  		intel_dp->aux_power_domain = POWER_DOMAIN_AUX_C;
> > > +		intel_dp->aux_io_power_domain = POWER_DOMAIN_AUX_IO_C;
> > >  		break;
> > >  	case PORT_D:
> > >  		intel_dp->aux_power_domain = POWER_DOMAIN_AUX_D;
> > > +		intel_dp->aux_io_power_domain = POWER_DOMAIN_AUX_IO_D;
> > >  		break;
> > >  	case PORT_E:
> > >  		/* FIXME: Check VBT for actual wiring of PORT E */
> > >  		intel_dp->aux_power_domain = POWER_DOMAIN_AUX_D;
> > > +		intel_dp->aux_io_power_domain = POWER_DOMAIN_AUX_IO_D;
> > >  		break;
> > >  	case PORT_F:
> > >  		intel_dp->aux_power_domain = POWER_DOMAIN_AUX_F;
> > > +		intel_dp->aux_io_power_domain = POWER_DOMAIN_AUX_IO_F;
> > >  		break;
> > >  	default:
> > >  		MISSING_CASE(encoder->port);
> > > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > > index 898064e8bea7..c7c4180e41d8 100644
> > > --- a/drivers/gpu/drm/i915/intel_drv.h
> > > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > > @@ -1071,6 +1071,7 @@ struct intel_dp {
> > >  	struct drm_dp_desc desc;
> > >  	struct drm_dp_aux aux;
> > >  	enum intel_display_power_domain aux_power_domain;
> > > +	enum intel_display_power_domain aux_io_power_domain;
> > >  	uint8_t train_set[4];
> > >  	int panel_power_up_delay;
> > >  	int panel_power_down_delay;
> > > diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> > > index 2ef374f936b9..62de8f0632b0 100644
> > > --- a/drivers/gpu/drm/i915/intel_psr.c
> > > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > > @@ -484,6 +484,8 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp,
> > >  			   EDP_PSR_DEBUG_MASK_HPD |
> > >  			   EDP_PSR_DEBUG_MASK_LPSP);
> > >  	}
> > > +
> > > +	intel_display_power_get(dev_priv, intel_dp->aux_io_power_domain);
> > >  }
> > >  
> > >  /**
> > > @@ -617,6 +619,8 @@ static void hsw_psr_disable(struct intel_dp *intel_dp,
> > >  		else
> > >  			WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
> > >  	}
> > > +
> > > +	intel_display_power_put(dev_priv, intel_dp->aux_io_power_domain);
> > >  }
> > >  
> > >  /**
> > > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > > index 16790f2576ec..323c1babb0a0 100644
> > > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> > > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > > @@ -130,6 +130,16 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
> > >  		return "AUX_D";
> > >  	case POWER_DOMAIN_AUX_F:
> > >  		return "AUX_F";
> > > +	case POWER_DOMAIN_AUX_IO_A:
> > > +		return "AUX_IO_A";
> > > +	case POWER_DOMAIN_AUX_IO_B:
> > > +		return "AUX_IO_B";
> > > +	case POWER_DOMAIN_AUX_IO_C:
> > > +		return "AUX_IO_C";
> > > +	case POWER_DOMAIN_AUX_IO_D:
> > > +		return "AUX_IO_D";
> > > +	case POWER_DOMAIN_AUX_IO_F:
> > > +		return "AUX_IO_F";
> > >  	case POWER_DOMAIN_GMBUS:
> > >  		return "GMBUS";
> > >  	case POWER_DOMAIN_INIT:
> > > @@ -1853,18 +1863,23 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
> > >  	BIT_ULL(POWER_DOMAIN_INIT))
> > >  #define CNL_DISPLAY_AUX_A_POWER_DOMAINS (		\
> > >  	BIT_ULL(POWER_DOMAIN_AUX_A) |			\
> > > +	BIT_ULL(POWER_DOMAIN_AUX_IO_A) |		\
> > >  	BIT_ULL(POWER_DOMAIN_INIT))
> > >  #define CNL_DISPLAY_AUX_B_POWER_DOMAINS (		\
> > >  	BIT_ULL(POWER_DOMAIN_AUX_B) |			\
> > > +	BIT_ULL(POWER_DOMAIN_AUX_IO_B) |		\
> > >  	BIT_ULL(POWER_DOMAIN_INIT))
> > >  #define CNL_DISPLAY_AUX_C_POWER_DOMAINS (		\
> > >  	BIT_ULL(POWER_DOMAIN_AUX_C) |			\
> > > +	BIT_ULL(POWER_DOMAIN_AUX_IO_C) |		\
> > >  	BIT_ULL(POWER_DOMAIN_INIT))
> > >  #define CNL_DISPLAY_AUX_D_POWER_DOMAINS (		\
> > >  	BIT_ULL(POWER_DOMAIN_AUX_D) |			\
> > > +	BIT_ULL(POWER_DOMAIN_AUX_IO_D) |		\
> > >  	BIT_ULL(POWER_DOMAIN_INIT))
> > >  #define CNL_DISPLAY_AUX_F_POWER_DOMAINS (		\
> > >  	BIT_ULL(POWER_DOMAIN_AUX_F) |			\
> > > +	BIT_ULL(POWER_DOMAIN_AUX_IO_F) |		\
> > >  	BIT_ULL(POWER_DOMAIN_INIT))
> > >  #define CNL_DISPLAY_DDI_F_IO_POWER_DOMAINS (		\
> > >  	BIT_ULL(POWER_DOMAIN_PORT_DDI_F_IO) |		\
> > > -- 
> > > 2.14.1
> > > 
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-- 
Ville Syrjälä
Intel OTC
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