MIME-Version: 1.0
In-Reply-To: <20211112084302.2447931-1-yangcong5@huaqin.corp-partner.google.com>
References: <20211112084302.2447931-1-yangcong5@huaqin.corp-partner.google.com>
From:   Stephen Boyd <swboyd@chromium.org>
User-Agent: alot/0.9.1
Date:   Mon, 15 Nov 2021 15:44:25 -0800
Message-ID: <CAE-0n53zMYmm2DxmptUWNzXvLQb+4bY1mDby1G78Jf1Hjdbadw@mail.gmail.com>
Subject: Re: [PATCH] drm/bridge: parade-ps8640: Fix additional suspend/resume
 at bootup
To:     Laurent.pinchart@ideasonboard.com, a.hajda@samsung.com,
        airlied@linux.ie, daniel@ffwll.ch, dianders@google.com,
        jernej.skrabec@gmail.com, jonas@kwiboo.se, narmstrong@baylibre.com,
        philipchen@chromium.org, robert.foss@linaro.org,
        yangcong <yangcong5@huaqin.corp-partner.google.com>
Cc:     dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

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@huaqin.corp-partner.google.com>
> ---

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