Re: [PATCH v2 00/91] drm/vc4: Support BCM2711 Display Pipelin

From: Jian-Hong Pan
Date: Mon Jun 01 2020 - 03:59:29 EST

Maxime Ripard <maxime@xxxxxxxxxx> æ 2020å5æ28æ éå äå3:30åéï
> 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@xxxxxxxxxx> 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... Sorry for
> that.
> I've pushed my current branch here:

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

2. The screen flashes suddenly sometimes.

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

Jian-Hong Pan