[PATCH v2 2/2] drm/msm/dpu: Fix timeout issues on command mode panels

[AngeloGioacchino Del Regno]

Il 11/12/21 22:57, Marijn Suijten ha scritto:
> On 2021-12-12 00:49:09, Dmitry Baryshkov wrote:
>> On Sun, 12 Dec 2021 at 00:35, Marijn Suijten
>> <marijn.suijten at somainline.org> wrote:
>>> [..]
>>> On this note, does it perhaps make more sense to call the "internal"
>>> _dpu_encoder_phys_cmd_wait_for_idle function directly, instead of going
>>> through the "public" dpu_encoder_phys_cmd_wait_for_tx_complete which
>>> seems solely intended to handle the wait_for_tx_complete callback?
>>
>> Either one would work. The main difference is the error message. Do
>> you want to see it here if the wait times out or not?
> 
> I prefer calling _dpu_encoder_phys_cmd_wait_for_idle directly and
> optionally adding our own error message.  IIRC DRM_ERROR prints source
> information such as the function this originated from, and that makes it
> impossible to distinguish between the wait_for_tx_complete callback or
> the invocation through dpu_encoder_phys_cmd_wait_for_commit_done anyway.
> 
> - Marijn
> 

I wouldn't be happy to find myself in a situation in which I get strange
display slowness without any print to help me; for this reason, I find
having the print in place useful for debugging of both perf and fault.

Cheers,
- Angelo