[Intel-xe] [PATCH 25/42] drm/i915/xe2lpd: Add support for DP aux channels

[Matt Roper]

On Wed, Aug 23, 2023 at 10:07:23AM -0700, Lucas De Marchi wrote:
> From: Gustavo Sousa <gustavo.sousa at intel.com>
> 
> The location of aux channels registers for Xe2 display changed w.r.t.
> the previous version.

This is another case of "PICA register ordering where 'A' comes after
'TC4.'"  We should probably consolidate on the same design used in
"drm/i915/xe2lpd: Move registers to PICA."


Matt

> 
> BSpec: 69010
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp_aux.c | 43 ++++++++++++++++++++-
>  1 file changed, 42 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
> index 3fcf609a1444..1ab6964ee1c2 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
> @@ -714,6 +714,44 @@ static i915_reg_t xelpdp_aux_data_reg(struct intel_dp *intel_dp, int index)
>  	}
>  }
>  
> +static i915_reg_t xe2lpd_aux_ctl_reg(struct intel_dp *intel_dp)
> +{
> +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> +	enum aux_ch aux_ch = dig_port->aux_ch;
> +
> +	switch (aux_ch) {
> +	case AUX_CH_A:
> +	case AUX_CH_B:
> +	case AUX_CH_USBC1:
> +	case AUX_CH_USBC2:
> +	case AUX_CH_USBC3:
> +	case AUX_CH_USBC4:
> +		return XE2LPD_DP_AUX_CH_CTL(aux_ch);
> +	default:
> +		MISSING_CASE(aux_ch);
> +		return XE2LPD_DP_AUX_CH_CTL(AUX_CH_A);
> +	}
> +}
> +
> +static i915_reg_t xe2lpd_aux_data_reg(struct intel_dp *intel_dp, int index)
> +{
> +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> +	enum aux_ch aux_ch = dig_port->aux_ch;
> +
> +	switch (aux_ch) {
> +	case AUX_CH_A:
> +	case AUX_CH_B:
> +	case AUX_CH_USBC1:
> +	case AUX_CH_USBC2:
> +	case AUX_CH_USBC3:
> +	case AUX_CH_USBC4:
> +		return XE2LPD_DP_AUX_CH_DATA(aux_ch, index);
> +	default:
> +		MISSING_CASE(aux_ch);
> +		return XE2LPD_DP_AUX_CH_DATA(AUX_CH_A, index);
> +	}
> +}
> +
>  void intel_dp_aux_fini(struct intel_dp *intel_dp)
>  {
>  	if (cpu_latency_qos_request_active(&intel_dp->pm_qos))
> @@ -731,7 +769,10 @@ void intel_dp_aux_init(struct intel_dp *intel_dp)
>  	struct intel_encoder *encoder = &dig_port->base;
>  	enum aux_ch aux_ch = dig_port->aux_ch;
>  
> -	if (DISPLAY_VER(dev_priv) >= 14) {
> +	if (DISPLAY_VER(dev_priv) >= 20) {
> +		intel_dp->aux_ch_ctl_reg = xe2lpd_aux_ctl_reg;
> +		intel_dp->aux_ch_data_reg = xe2lpd_aux_data_reg;
> +	} else if (DISPLAY_VER(dev_priv) >= 14) {
>  		intel_dp->aux_ch_ctl_reg = xelpdp_aux_ctl_reg;
>  		intel_dp->aux_ch_data_reg = xelpdp_aux_data_reg;
>  	} else if (DISPLAY_VER(dev_priv) >= 12) {
> -- 
> 2.40.1
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation