linux-kernel - Re: [PATCH 1/2] drm/msm/dp: postpone irq_hpd event during connection pending state

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Message-ID: <161056933099.3661239.9450322359293035316@swboyd.mtv.corp.google.com>
Date:   Wed, 13 Jan 2021 12:22:10 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     khsieh@...eaurora.org
Cc:     dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, tanmay@...eaurora.org, abhinavk@...eaurora.org,
        aravindh@...eaurora.org, airlied@...ux.ie, daniel@...ll.ch,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/msm/dp: postpone irq_hpd event during connection pending state

Quoting khsieh@...eaurora.org (2021-01-13 09:44:24)
> On 2021-01-11 11:55, Stephen Boyd wrote:
> > Quoting Kuogee Hsieh (2021-01-07 12:30:24)
> >> irq_hpd event can only be executed at connected state. Therefore
> >> irq_hpd event should be postponed if it happened at connection
> >> pending state. This patch also make sure both link rate and lane
> > 
> > Why does it happen at connection pending state?
> plug in need two state to complete it.
> advance to connection pending state once link training completed and 
> sent uevent notification to frame work.
> transition to connected state after frame work provided resolution 
> timing and start transmit video panel.
> Therefore irq_hpd should not be handled if it occurred before connected 
> state.

Sure that's what's going on in the patch but you didn't answer my
question. Why does irq_hpd happen before connected state?