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

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@codeaurora.org

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Reviewed-by: Stephen Boyd swboyd@chromium.org