[Intel-gfx] [PATCH 2/2] drm/i915/icl: Set TBT IO in Aux transaction

[Srivatsa, Anusha]

>-----Original Message-----
>From: Zanoni, Paulo R
>Sent: Wednesday, July 25, 2018 4:08 PM
>To: Srivatsa, Anusha <anusha.srivatsa at intel.com>; intel-
>gfx at lists.freedesktop.org
>Subject: Re: [PATCH 2/2] drm/i915/icl: Set TBT IO in Aux transaction
>
>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 at intel.com>
>> Signed-off-by: Anusha Srivatsa <anusha.srivatsa at 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.
 That is true.

>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;
That’s a much better approach.
Thanks for the feedback.

Anusha 

>---
>
>
>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