linux-kernel - Re: [PATCH] drm/bridge: parade-ps8640: Fix additional suspend/resume at bootup

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Message-ID: <CAE-0n53zMYmm2DxmptUWNzXvLQb+4bY1mDby1G78Jf1Hjdbadw@mail.gmail.com>
Date:   Mon, 15 Nov 2021 15:44:25 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Laurent.pinchart@...asonboard.com, a.hajda@...sung.com,
        airlied@...ux.ie, daniel@...ll.ch, dianders@...gle.com,
        jernej.skrabec@...il.com, jonas@...boo.se, narmstrong@...libre.com,
        philipchen@...omium.org, robert.foss@...aro.org,
        yangcong <yangcong5@...qin.corp-partner.google.com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: parade-ps8640: Fix additional suspend/resume
 at bootup

Quoting yangcong (2021-11-12 00:43:02)
> Through log and waveform, we can see that there will be additional
> suspend/resume when booting. This timing does not meet the ps8640 spec.
> It seems that the delay of 500ms does not satisfied drm_panel_get_modes.
> I increased it to 900ms and it seems that this problem can be solved.
> To be safe, I'd just round up to a full 1000.
>
> Signed-off-by: yangcong <yangcong5@...qin.corp-partner.google.com>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>