Re: [PATCH 40/43] drm/i915: Store aux data reg offsets in intel_dp->aux_ch_data_reg[]

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

On Mon, Sep 28, 2015 at 03:28:18PM +0300, Jani Nikula wrote:
> On Fri, 18 Sep 2015, ville.syrjala@linux.intel.com wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >
> > Rather than computing on demand, store also the aux data reg
> > offsets under intel_dp.
> >
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_dp.c  | 49 +++++++++++++++++++++++++++-------------
> >  drivers/gpu/drm/i915/intel_drv.h |  1 +
> >  2 files changed, 34 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 27df240..0e5f674 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -791,7 +791,6 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
> >  	struct drm_device *dev = intel_dig_port->base.base.dev;
> >  	struct drm_i915_private *dev_priv = dev->dev_private;
> >  	uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;
> > -	uint32_t ch_data = ch_ctl + 4;
> >  	uint32_t aux_clock_divider;
> >  	int i, ret, recv_bytes;
> >  	uint32_t status;
> > @@ -857,7 +856,7 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
> >  		for (try = 0; try < 5; try++) {
> >  			/* Load the send data into the aux channel data registers */
> >  			for (i = 0; i < send_bytes; i += 4)
> > -				I915_WRITE(ch_data + i,
> > +				I915_WRITE(intel_dp->aux_ch_data_reg[i >> 2],
> >  					   intel_dp_pack_aux(send + i,
> >  							     send_bytes - i));
> >  
> > @@ -921,7 +920,7 @@ done:
> >  		recv_bytes = recv_size;
> >  
> >  	for (i = 0; i < recv_bytes; i += 4)
> > -		intel_dp_unpack_aux(I915_READ(ch_data + i),
> > +		intel_dp_unpack_aux(I915_READ(intel_dp->aux_ch_data_reg[i >> 2]),
> >  				    recv + i, recv_bytes - i);
> >  
> >  	ret = recv_bytes;
> > @@ -1009,19 +1008,22 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
> >  	return ret;
> >  }
> >  
> > -static uint32_t g4x_aux_ctl_reg(struct drm_i915_private *dev_priv,
> > -				enum port port)
> > +static uint32_t g4x_aux_reg(struct drm_i915_private *dev_priv,
> > +			    enum port port, int index)
> >  {
> > -	return DP_AUX_CH_CTL(port);
> > +	return index < 0 ? DP_AUX_CH_CTL(port) :
> > +		DP_AUX_CH_DATA(port, index);
> >  }
> >  
> > -static uint32_t ilk_aux_ctl_reg(struct drm_i915_private *dev_priv,
> > -				enum port port)
> > +static uint32_t ilk_aux_reg(struct drm_i915_private *dev_priv,
> > +			    enum port port, int index)
> >  {
> >  	if (port == PORT_A)
> > -		return DP_AUX_CH_CTL(port);
> > +		return index < 0 ? DP_AUX_CH_CTL(port) :
> > +			DP_AUX_CH_DATA(port, index);
> >  	else
> > -		return PCH_DP_AUX_CH_CTL(port);
> > +		return index < 0 ? PCH_DP_AUX_CH_CTL(port) :
> > +			PCH_DP_AUX_CH_DATA(port, index);
> >  }
> >  
> >  /*
> > @@ -1048,13 +1050,28 @@ static enum port skl_porte_aux_port(struct drm_i915_private *dev_priv)
> >  	}
> >  }
> >  
> > -static uint32_t skl_aux_ctl_reg(struct drm_i915_private *dev_priv,
> > -				enum port port)
> > +static uint32_t skl_aux_reg(struct drm_i915_private *dev_priv,
> > +			    enum port port, int index)
> >  {
> >  	if (port == PORT_E)
> >  		port = skl_porte_aux_port(dev_priv);
> >  
> > -	return DP_AUX_CH_CTL(port);
> > +	return index < 0 ? DP_AUX_CH_CTL(port) :
> > +		DP_AUX_CH_DATA(port, index);
> > +}
> > +
> > +static void aux_reg_init(struct intel_dp *intel_dp,
> > +			 uint32_t (*aux_reg)(struct drm_i915_private *dev_priv,
> > +					     enum port port, int index))
> > +{
> > +	struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
> > +	enum port port = dp_to_dig_port(intel_dp)->port;
> > +	int i;
> > +
> > +	intel_dp->aux_ch_ctl_reg = aux_reg(dev_priv, port, -1);
> > +
> > +	for (i = 0; i < ARRAY_SIZE(intel_dp->aux_ch_data_reg); i++)
> > +		intel_dp->aux_ch_data_reg[i] = aux_reg(dev_priv, port, i);
> >  }
> >  
> >  static void
> > @@ -1074,11 +1091,11 @@ intel_dp_aux_init(struct intel_dp *intel_dp, struct intel_connector *connector)
> >  	};
> >  
> >  	if (INTEL_INFO(dev_priv)->gen >= 9)
> > -		intel_dp->aux_ch_ctl_reg = skl_aux_ctl_reg(dev_priv, port);
> > +		aux_reg_init(intel_dp, skl_aux_reg);
> >  	else if (HAS_PCH_SPLIT(dev_priv))
> > -		intel_dp->aux_ch_ctl_reg = ilk_aux_ctl_reg(dev_priv, port);
> > +		aux_reg_init(intel_dp, ilk_aux_reg);
> >  	else
> > -		intel_dp->aux_ch_ctl_reg = g4x_aux_ctl_reg(dev_priv, port);
> > +		aux_reg_init(intel_dp, g4x_aux_reg);
> 
> 
> IMO there's too much trickery in this patch to get the registers set
> up. -1 for ctl, i >> 2 to get the right index, function pointers for set
> up only, etc. I don't think it would be too much duplication to add
> separate initializers for each group of platforms, ditching the function
> pointers and -1 for ctl.

Less LOC, less bugs. But I can blow up the LOC count here if people
prefer that.

> 
> BR,
> Jani.
> 
> 
> 
> 
> >  
> >  	intel_dp->aux.name = ddc_name[port];
> >  	intel_dp->aux.dev = dev->dev;
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index 1df6ebf..3fea039 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -717,6 +717,7 @@ struct sink_crc {
> >  struct intel_dp {
> >  	uint32_t output_reg;
> >  	uint32_t aux_ch_ctl_reg;
> > +	uint32_t aux_ch_data_reg[5];
> >  	uint32_t DP;
> >  	int link_rate;
> >  	uint8_t lane_count;
> > -- 
> > 2.4.6
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center

-- 
Ville Syrjälä
Intel OTC
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