[PATCH v2] drm/msm/dp: do not complete dp_aux_cmd_fifo_tx() if irq is not for aux transfer

[Dmitry Baryshkov]

On 15/12/2022 22:10, Stephen Boyd wrote:
> Quoting Dmitry Baryshkov (2022-12-15 10:46:42)
>> On 15/12/2022 20:32, Kuogee Hsieh wrote:
>>>        if (!aux->cmd_busy)
>>>                return;
>>>
>>>        if (aux->native)
>>> -             dp_aux_native_handler(aux, isr);
>>> +             ret = dp_aux_native_handler(aux, isr);
>>>        else
>>> -             dp_aux_i2c_handler(aux, isr);
>>> +             ret = dp_aux_i2c_handler(aux, isr);
>>>
>>> -     complete(&aux->comp);
>>> +     if (ret == IRQ_HANDLED)
>>> +             complete(&aux->comp);
>>
>> Can you just move the complete() into the individual handling functions?
>> Then you won't have to return the error code from dp_aux_*_handler() at
>> all. You can check `isr' in that function and call complete if there was
>> any error.
> 
> I'd prefer we apply my patch and pass the irqreturn_t variable to the
> caller of this function so spurious irqs are shutdown. Should I send it
> as a proper patch?

I'm for handling the spurious IRQs in a proper way. However I believe 
that it's not related to the issue Kuogee is trying to fix.

Thus I think we should have two separate patches: one fixing the EDID 
corruption issue (for which the proper fix is !isr check, IIUC) and the 
irqreturn_t. And for the irqreturn_t it might be beneficial to move 
complete() call to the dp_aux_foo_handler(). Or might be not. That would 
depend on the patch itself.


-- 
With best wishes
Dmitry