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Date:   Wed, 19 Aug 2020 19:01:46 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linuxarm@...wei.com, mauro.chehab@...wei.com,
        Manivannan Sadhasivam <mani@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Bogdan Togorean <bogdan.togorean@...log.com>,
        Liwei Cai <cailiwei@...ilicon.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Rob Herring <robh+dt@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Xinliang Liu <xinliang.liu@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Wanchun Zheng <zhengwanchun@...ilicon.com>,
        driverdevel <devel@...verdev.osuosl.org>,
        BPF Mailing List <bpf@...r.kernel.org>,
        linux-media <linux-media@...r.kernel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Rob Clark <robdclark@...omium.org>,
        Laurentiu Palcu <laurentiu.palcu@....com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        John Fastabend <john.fastabend@...il.com>,
        Liuyao An <anliuyao@...wei.com>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>, Wei Xu <xuwei5@...ilicon.com>,
        Rongrong Zou <zourongrong@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sam Ravnborg <sam@...nborg.org>,
        Network Development <netdev@...r.kernel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Chen Feng <puck.chen@...ilicon.com>
Subject: Re: [PATCH 00/49] DRM driver for Hikey 970

On Wed, Aug 19, 2020 at 2:36 PM John Stultz <john.stultz@...aro.org> wrote:
>
> On Wed, Aug 19, 2020 at 4:46 AM Mauro Carvalho Chehab
> <mchehab+huawei@...nel.org> wrote:
> > So, IMO, the best is to keep it on staging for a while, until those
> > remaining bugs gets solved.
> >
> > I added this series, together with the regulator driver and
> > a few other patches (including a hack to fix a Kernel 5.8
> > regression at WiFi ) at:
> >
> >         https://gitlab.freedesktop.org/mchehab_kernel/hikey-970/-/commits/master
>
> Sorry, one more small request: Could you create a branch that only has
> the DRM driver changes in it?
>
> The reason I ask, is that since the HiKey960 isn't affected by the
> majority of the problems you listed as motivation for going through
> staging. So if we can validate that your tree works fine on HiKey960,
> the series can be cleaned up and submitted properly upstream to enable
> that SoC, and the outstanding 970 issues can be worked out afterwards
> against mainline.

Just as a heads up, I tried testing your tree with my HiKey960, and
after fixing the compat string inconsistency, the drivers seem to load
properly. However the drm_hwcomposer seems to have some trouble with
the driver:
01-01 00:12:41.456   345   345 E hwc-drm-display-compositor: Commit
test failed for display 0, FIXME
01-01 00:12:41.456   345   345 E hwc-drm-two: Failed to apply the
frame composition ret=-22
01-01 00:12:41.456   351   351 E HWComposer:
presentAndGetReleaseFences: present failed for display 0: BadParameter
(4)

I'll dig in a bit further as to why, but wanted to give you a heads up.

thanks
-john

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