linux-kernel - Re: [PATCH v5 00/80] drm/vc4: Support BCM2711 Display Pipeline

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Date:   Tue, 8 Sep 2020 14:00:19 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Hoegeun Kwon <hoegeun.kwon@...sung.com>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>, devicetree@...r.kernel.org,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        Phil Elwell <phil@...pberrypi.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 00/80] drm/vc4: Support BCM2711 Display Pipeline

Hi Hoegeun,

On Mon, Sep 07, 2020 at 08:49:12PM +0900, Hoegeun Kwon wrote:
> On 9/3/20 5:00 PM, Maxime Ripard wrote:
> > Hi everyone,
> >
> > Here's a (pretty long) series to introduce support in the VC4 DRM driver
> > for the display pipeline found in the BCM2711 (and thus the RaspberryPi 4).
> >
> > The main differences are that there's two HDMI controllers and that there's
> > more pixelvalve now. Those pixelvalve come with a mux in the HVS that still
> > have only 3 FIFOs. Both of those differences are breaking a bunch of
> > expectations in the driver, so we first need a good bunch of cleanup and
> > reworks to introduce support for the new controllers.
> >
> > Similarly, the HDMI controller has all its registers shuffled and split in
> > multiple controllers now, so we need a bunch of changes to support this as
> > well.
> >
> > Only the HDMI support is enabled for now (even though the DPI and DSI
> > outputs have been tested too).
> >
> > Let me know if you have any comments
> > Maxime
> >
> > Cc: bcm-kernel-feedback-list@...adcom.com
> > Cc: devicetree@...r.kernel.org
> > Cc: Kamal Dasu <kdasu.kdev@...il.com>
> > Cc: Philipp Zabel <p.zabel@...gutronix.de>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Stephen Boyd <sboyd@...nel.org>
> >
> > Changes from v4:
> >    - Rebased on top of next-20200828
> >    - Collected the various tags
> >    - Fixed some issues with 4k support and dual output (thanks Hoegeun!)
> 
> Thanks for your v5 patchset.
> 
> I tested all patches based on the next-20200812.

Thanks again for testing all the patches

> Everything else is fine, but the dual hdmi modetest doesn't work well in my
> environment...
> 
> In my environment, dsi is not connected, I have seen your answer[1].

Can you share a bit more your setup? What monitors are being connected
to each HDMI port? Do you hotplug any?

Maxime