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

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Date:   Mon, 16 Sep 2019 10:13:58 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Brian Masney <masneyb@...tation.org>, bjorn.andersson@...aro.org,
        robh+dt@...nel.org, agross@...nel.org, narmstrong@...libre.com,
        robdclark@...il.com, sean@...rly.run
Cc:     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 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?


Regards

Andrzej


>
> Brian Masney (11):
>   dt-bindings: drm/bridge: analogix-anx78xx: add new variants
>   drm/bridge: analogix-anx78xx: add new variants
>   drm/bridge: analogix-anx78xx: silence -EPROBE_DEFER warnings
>   drm/bridge: analogix-anx78xx: convert to i2c_new_dummy_device
>   drm/bridge: analogix-anx78xx: correct value of TX_P0
>   drm/bridge: analogix-anx78xx: add support for avdd33 regulator
>   ARM: qcom_defconfig: add CONFIG_DRM_ANALOGIX_ANX78XX
>   drm/msm/hdmi: silence -EPROBE_DEFER warning
>   ARM: dts: qcom: pm8941: add 5vs2 regulator node
>   ARM: dts: qcom: msm8974: add HDMI nodes
>   ARM: dts: qcom: msm8974-hammerhead: add support for external display
>
>  .../bindings/display/bridge/anx7814.txt       |   6 +-
>  .../qcom-msm8974-lge-nexus5-hammerhead.dts    | 140 ++++++++++++++++++
>  arch/arm/boot/dts/qcom-msm8974.dtsi           |  80 ++++++++++
>  arch/arm/boot/dts/qcom-pm8941.dtsi            |  10 ++
>  arch/arm/configs/qcom_defconfig               |   1 +
>  drivers/gpu/drm/bridge/analogix-anx78xx.c     |  60 +++++++-
>  drivers/gpu/drm/bridge/analogix-anx78xx.h     |   2 +-
>  drivers/gpu/drm/msm/hdmi/hdmi_phy.c           |   8 +-
>  8 files changed, 295 insertions(+), 12 deletions(-)
>