[Freedreno] [PATCH] drm/msm/dp: reset dp controller only at boot up and pm_resume

[Stephen Boyd]

Quoting Kuogee Hsieh (2021-02-05 12:44:38)
> DP_SW_RESET is the global SW reset that is used to initialize DP
> controller. If DP_SW_RESET executed during connection setup,
> two HPD related side effects may occurred,
> 1) pending HPD interrupts cleared unexpected
> 2) re start debounce logic which trigger another interrupt
> This patch only issue DP_SW_RESET at boot up and pm_resume.
> This patch also reinit video_comp before configure dp controller
> to avoid missing VIDEO_READY interrupt.
> 
> Fixes: 9fc418430c65 ("drm/msm/dp: unplug interrupt missed after irq_hpd handler")
> Signed-off-by: Kuogee Hsieh <khsieh at codeaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd at chromium.org>