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SubjectRe: [PATCH v1 2/3] drm/msm/dp: decoupling dp->id out of dp controller_id at scxxxx_dp_cfg table
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On 6/24/2022 4:12 PM, Stephen Boyd wrote:
> Quoting Kuogee Hsieh (2022-06-24 15:53:45)
>> MSM_DP_CONTROLLER_1 need to match to the index = 1 of sc7280_dp_cfg[] <== This is correct
>>
>> The problem is sc7280_dp_cfg[] have two entries since eDP place at index
>> of MSM_DP_CONTROLLER_1.
>>
>> but .num_desc = 1  <== this said only have one entry at sc7280_dp_cfg[]
>> table. Therefore eDP will never be found at for loop  at
>> _dpu_kms_initialize_displayport().
>>
> Yes, but what else does the MSM_DP_CONTROLLER_1 need to match? Because
> the intention of the previous commit was to make it so the order of
> sc7280_dp_cfg couldn't be messed up and not match the
> MSM_DP_CONTROLLER_1 value that lives in sc7280_intf[].


at  _dpu_kms_initialize_displayport()

> - info.h_tile_instance[0] = i; <== assign i to become dp controller id, "i" is index of scxxxx_dp_cfg[]

This what I mean MSM_DP_CONTROLLER_1 need to match to index = 1 of
scxxxx_dp_cfg[].

it it is not match, then MSM_DP_CONTROLLER_1 with match to different INTF.


>
>> Sorry, my mistake. it is not in drm_bridge_add.
>>
>> It should be in dpu_encoder_init() of _dpu_kms_initialize_displayport().
>>
>> can you make below changes (patch) to _dpu_kms_initialize_displayport().
>>
> Yes, I've made that change to try to understand the problem. I still
> don't understand, sadly. Does flipping the order of iteration through
> 'priv->dp' somehow mean that the crtc that is assigned to the eDP
> connector is left unchanged? Whereas without registering the eDP encoder
> first means we have to change the crtc for the eDP encoder and that
> can't be done atomically?

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