Re: [PATCH v2] drm/msm/dp: remove fail safe mode related code

[Stephen Boyd]

Quoting Kuogee Hsieh (2022-04-25 22:56:35)
> Current DP driver implementation has adding safe mode done at
> dp_hpd_plug_handle() which is expected to be executed under event
> thread context.
>
> However there is possible circular locking happen (see blow stack trace)
> after edp driver call dp_hpd_plug_handle() from dp_bridge_enable() which
> is executed under drm_thread context.
>
> After review all possibilities methods and as discussed on
> https://patchwork.freedesktop.org/patch/483155/, supporting EDID
> compliance tests in the driver is quite hacky. As seen with other
> vendor drivers, supporting these will be much easier with IGT. Hence
> removing all the related fail safe code for it so that no possibility
> of circular lock will happen.
[...]
>
> Changes in v2:
> -- re text commit title
> -- remove all fail safe mode
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>

Should add some Fixes tags here, probably for the first introduction of
this logic and the one that moved stuff around to try to avoid the
lockdep warning.