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

[Jani Nikula <jani.nikula@linux.intel.com>]

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.

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
>
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-- 
Jani Nikula, Intel Open Source Technology Center
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