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From:   Jian-Hong Pan <jian-hong@endlessm.com>
Date:   Mon, 1 Jun 2020 15:58:26 +0800
Message-ID: <CAPpJ_ec1KRwUrHGVVZrReaDPz4iga-Nvj5H652-tTKmkXL=Xmg@mail.gmail.com>
Subject: Re: [PATCH v2 00/91] drm/vc4: Support BCM2711 Display Pipelin
To:     Maxime Ripard <maxime@cerno.tech>
Cc:     Daniel Drake <drake@endlessm.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        Eric Anholt <eric@anholt.net>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        linux-rpi-kernel@lists.infradead.org,
        bcm-kernel-feedback-list@broadcom.com,
        linux-arm-kernel@lists.infradead.org,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        linux-clk@vger.kernel.org, linux-i2c@vger.kernel.org,
        Linux Upstreaming Team <linux@endlessm.com>
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Maxime Ripard <maxime@cerno.tech> =E6=96=BC 2020=E5=B9=B45=E6=9C=8828=E6=97=
=A5 =E9=80=B1=E5=9B=9B =E4=B8=8B=E5=8D=883:30=E5=AF=AB=E9=81=93=EF=BC=9A
>
> Hi Daniel,
>
> On Wed, May 27, 2020 at 05:15:12PM +0800, Daniel Drake wrote:
> > On Wed, May 27, 2020 at 5:13 PM Maxime Ripard <maxime@cerno.tech> wrote=
:
> > > I'm about to send a v3 today or tomorrow, I can Cc you (and Jian-Hong=
) if you
> > > want.
> >
> > That would be great, although given the potentially inconsistent
> > results we've been seeing so far it would be great if you could
> > additionally push a git branch somewhere.
> > That way we can have higher confidence that we are applying exactly
> > the same patches to the same base etc.
>
> So I sent a new iteration yesterday, and of course forgot to cc you... So=
rry for
> that.
>
> I've pushed my current branch here:
> https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux.git/log/?h=
=3Drpi4-kms

Thanks to Maxime!

I have tried your repository on branch rpi4-kms.  The DRM VC4 is used!
But got some issues:
1. Some weird error message in dmesg.  Not sure it is related, or not
[    5.219321] [drm:vc5_hdmi_init_resources] *ERROR* Failed to get
HDMI state machine clock
https://gist.github.com/starnight/3f317dca121065a361cf08e91225e389

2. The screen flashes suddenly sometimes.

3. The higher resolutions, like 1920x1080 ... are lost after hot
re-plug HDMI cable (HDMI0)

Jian-Hong Pan