[Intel-gfx] [RFC 3/6] drm/i915/dp: Preparation for DP phy compliance auto test.

[Animesh Manna]

On 10/22/2019 4:59 AM, Manasi Navare wrote:
> On Thu, Oct 03, 2019 at 08:36:50PM +0530, Animesh Manna wrote:
>> During DP phy compliance auto test mode, sink will request
>> combination of different test pattern with differnt level of
>> vswing, pre-emphasis. Function added to prepare for it.
>>
>> Signed-off-by: Animesh Manna <animesh.manna at intel.com>
> This patch looks good to me, could you add a comment for why
> link_mst is set to false?

Thanks, link_mst is set to false to avoid executing mst related code 
during compliance testing... will add as comment.

Regards.
Animesh
>
> Manasi
>
>> ---
>>   .../drm/i915/display/intel_display_types.h    |  1 +
>>   drivers/gpu/drm/i915/display/intel_dp.c       | 29 +++++++++++++++++++
>>   2 files changed, 30 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
>> index 976669f01a8c..5d6d44fa2594 100644
>> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
>> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
>> @@ -1142,6 +1142,7 @@ struct intel_dp_compliance_data {
>>   	u8 video_pattern;
>>   	u16 hdisplay, vdisplay;
>>   	u8 bpc;
>> +	struct drm_dp_phy_test_params phytest;
>>   };
>>   
>>   struct intel_dp_compliance {
>> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
>> index 7d33e20dfc87..a19141fc672e 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
>> @@ -4738,9 +4738,38 @@ static u8 intel_dp_autotest_edid(struct intel_dp *intel_dp)
>>   	return test_result;
>>   }
>>   
>> +static u8 intel_dp_prepare_phytest(struct intel_dp *intel_dp)
>> +{
>> +	struct drm_dp_phy_test_params *data =
>> +		&intel_dp->compliance.test_data.phytest;
>> +	u8 link_status[DP_LINK_STATUS_SIZE];
>> +
>> +	if (!drm_dp_get_phy_test_pattern(&intel_dp->aux, data)) {
>> +		DRM_DEBUG_KMS("DP Phy Test pattern AUX read failure\n");
>> +		return DP_TEST_NAK;
>> +	}
>> +
>> +	if (!intel_dp_get_link_status(intel_dp, link_status)) {
>> +		DRM_DEBUG_KMS("failed to get link status\n");
>> +		return DP_TEST_NAK;
>> +	}
>> +
>> +	intel_dp->link_mst = false;
>> +
>> +	/* retrieve vswing & pre-emphasis setting */
>> +	intel_get_adjust_train(intel_dp, link_status);
>> +
>> +	return DP_TEST_ACK;
>> +}
>> +
>>   static u8 intel_dp_autotest_phy_pattern(struct intel_dp *intel_dp)
>>   {
>>   	u8 test_result = DP_TEST_NAK;
>> +
>> +	test_result = intel_dp_prepare_phytest(intel_dp);
>> +	if (test_result != DP_TEST_ACK)
>> +		DRM_ERROR("Phy test preparation failed\n");
>> +
>>   	return test_result;
>>   }
>>   
>> -- 
>> 2.22.0
>>