Re: [PATCH 2/2] drm/i915/icl: Set TBT IO in Aux transaction

[Paulo Zanoni <paulo.r.zanoni@intel.com>]

Em Qua, 2018-07-25 às 14:28 -0700, Anusha Srivatsa escreveu:
> For a TBT sequence, we need to set the IO type to TBT
> in  DDI_AUX_CTL.
> 
> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h |  1 +
>  drivers/gpu/drm/i915/intel_dp.c | 34 +++++++++++++++++++++++++----
> -----
>  2 files changed, 26 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h
> index 5530c47..7bdc214 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5558,6 +5558,7 @@ enum {
>  #define   DP_AUX_CH_CTL_PSR_DATA_AUX_REG_SKL	(1 << 14)
>  #define   DP_AUX_CH_CTL_FS_DATA_AUX_REG_SKL	(1 << 13)
>  #define   DP_AUX_CH_CTL_GTC_DATA_AUX_REG_SKL	(1 << 12)
> +#define   DP_AUX_CH_CTL_TBT_IO			(1 << 11)
>  #define   DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL_MASK (0x1f << 5)
>  #define   DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(c) (((c) - 1) << 5)
>  #define   DP_AUX_CH_CTL_SYNC_PULSE_SKL(c)   ((c) - 1)
> diff --git a/drivers/gpu/drm/i915/intel_dp.c
> b/drivers/gpu/drm/i915/intel_dp.c
> index cc33d7c..90a8e2f 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1208,15 +1208,31 @@ static uint32_t skl_get_aux_send_ctl(struct
> intel_dp *intel_dp,
>  				      int send_bytes,
>  				      uint32_t unused)
>  {
> -	return DP_AUX_CH_CTL_SEND_BUSY |
> -	       DP_AUX_CH_CTL_DONE |
> -	       DP_AUX_CH_CTL_INTERRUPT |
> -	       DP_AUX_CH_CTL_TIME_OUT_ERROR |
> -	       DP_AUX_CH_CTL_TIME_OUT_MAX |
> -	       DP_AUX_CH_CTL_RECEIVE_ERROR |
> -	       (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
> -	       DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(32) |
> -	       DP_AUX_CH_CTL_SYNC_PULSE_SKL(32);
> +	struct intel_digital_port *intel_dig_port =
> dp_to_dig_port(intel_dp);
> +	struct drm_i915_private *dev_priv = to_i915(intel_dig_port-
> >base.base.dev);
> +
> +	if (INTEL_GEN(dev_priv) >= 11

There's no need for this check, since intel_dig_port->tc_type can't be
TC_PORT_TBT on platforms earlier than gen11.

If we were to add a check, I'd suggest to use intel_port_is_tc(), but I
don't see the need.

There's a lot of avoidable duplicate code. Please avoid it with
something like:

---
uint32_t ret;

ret = DP_AUX_CH_CTL_SEND_BUSY |
      DP_AUX_CH_CTL_DONE |
      etc;

if (intel_dig_port->tc_type == TC_PORT_TBT)
	ret |= DP_AUX_CH_CTL_TBT_IO;

return ret;
---


Thanks,
Paulo

>  && intel_dig_port->tc_type == TC_PORT_TBT) {
> +		return DP_AUX_CH_CTL_SEND_BUSY |
> +		       DP_AUX_CH_CTL_DONE |
> +		       DP_AUX_CH_CTL_INTERRUPT |
> +		       DP_AUX_CH_CTL_TIME_OUT_ERROR |
> +		       DP_AUX_CH_CTL_TIME_OUT_MAX |
> +		       DP_AUX_CH_CTL_RECEIVE_ERROR |
> +		       (send_bytes <<
> DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
> +		       DP_AUX_CH_CTL_TBT_IO |
> +		       DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(32) |
> +		       DP_AUX_CH_CTL_SYNC_PULSE_SKL(32);
> +	} else {
> +		return DP_AUX_CH_CTL_SEND_BUSY |
> +		       DP_AUX_CH_CTL_DONE |
> +		       DP_AUX_CH_CTL_INTERRUPT |
> +		       DP_AUX_CH_CTL_TIME_OUT_ERROR |
> +		       DP_AUX_CH_CTL_TIME_OUT_MAX |
> +		       DP_AUX_CH_CTL_RECEIVE_ERROR |
> +		       (send_bytes <<
> DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
> +		       DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(32) |
> +		       DP_AUX_CH_CTL_SYNC_PULSE_SKL(32);
> +	}
>  }
>  
>  static int
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