linux-kernel - Re: [PATCH 00/11] ARM: dts: qcom: msm8974: add support for external display

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Date:   Mon, 16 Sep 2019 05:01:50 -0400
From:   Brian Masney <masneyb@...tation.org>
To:     Andrzej Hajda <a.hajda@...sung.com>
Cc:     bjorn.andersson@...aro.org, robh+dt@...nel.org, agross@...nel.org,
        narmstrong@...libre.com, robdclark@...il.com, sean@...rly.run,
        airlied@...ux.ie, daniel@...ll.ch, mark.rutland@....com,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...l.net, linus.walleij@...aro.org,
        enric.balletbo@...labora.com, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 00/11] ARM: dts: qcom: msm8974: add support for external
 display

Hi Andrzej,

On Mon, Sep 16, 2019 at 10:13:58AM +0200, Andrzej Hajda wrote:
> Hi Brian,
> 
> On 15.08.2019 02:48, Brian Masney wrote:
> > This patch series begins to add support for the external display over
> > HDMI that is supported on msm8974 SoCs. I'm testing this series on the
> > Nexus 5, and I'm able to communicate with the HDMI bridge via the
> > analogix-anx78xx driver, however the external display is not working
> > yet.
> >
> > When I plug in the HDMI cable, the monitor detects that a device is
> > hooked up, but nothing is shown on the external monitor. The hot plug
> > detect GPIO (hpd-gpios) on the analogix-anx78xx bridge and MSM HDMI
> > drivers do not change state when the slimport adapter or HDMI cable is
> > plugged in or removed. I wonder if a regulator is not enabled somewhere?
> > I have a comment in patch 10 regarding 'hpd-gdsc-supply' that may
> > potentially be an issue.
> >
> > I'm still digging in on this, however I'd appreciate any feedback if
> > anyone has time. Most of these patches are ready now, so I marked the
> > ones that aren't ready with 'PATCH RFC'.
> >
> > I'm using an Analogix Semiconductor SP6001 SlimPort Micro-USB to 4K HDMI
> > Adapter to connect my phone to an external display via a standard HDMI
> > cable. This works just fine with the downstream MSM kernel using
> > Android.
> 
> 
> This patchset risks to be forgotten. To avoid it, at least partially, I
> can merge patches 1-5, is it OK for you?

That would be great if you could do that.

Thanks,

Brian