[PATCH] drm/msm/dp: check hpd_state before push idle pattern at dp_bridge_disable()

[Stephen Boyd]

Quoting Kuogee Hsieh (2022-08-09 13:44:50)
> dp_bridge_disable() is the first step toward tearing down main link.
> Its major function is to start transmitting idle pattern to replace
> video stream. This patch will check hpd_state to make sure main link
> is enabled before commit changes of main link's configuration to
> push idle pattern out to avoid system crashing due to main link clock
> is disabled while access main link registers.
>
> Fixes: 13ea4799a81b ("drm/msm/dp: remove extra wrappers and public functions");

Does it really fix 375a126090b9 ("drm/msm/dp: tear down main link at
unplug handle immediately")? I don't see how removing extra wrappers
caused us to start trying to set the idle pattern when the device was
unclocked.