From: Brian Masney <masneyb@onstation.org>
To: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
Sean Paul <sean@poorly.run>, Rob Herring <robh@kernel.org>,
Jonathan Marek <jonathan@marek.ca>,
Dave Airlie <airlied@linux.ie>,
MSM <linux-arm-msm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
Rob Clark <robdclark@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
freedreno@lists.freedesktop.org
Subject: Re: [Freedreno] [PATCH RFC v2 0/6] ARM: qcom: initial Nexus 5 display support
Date: Tue, 28 May 2019 22:46:48 -0400 [thread overview]
Message-ID: <20190529024648.GA13436@basecamp> (raw)
In-Reply-To: <CAOCk7NqfdNkRJkbJY70XWN-XvdtFJ0UVn3_9rbgAsNCdR7q5PQ@mail.gmail.com>
On Tue, May 28, 2019 at 07:42:19PM -0600, Jeffrey Hugo wrote:
> > > Do you know if the nexus 5 has a video or command mode panel? There
> > > is some glitchyness with vblanks and command mode panels.
> >
> > Its in command mode. I know this because I see two 'pp done time out'
> > messages, even on 4.17. Based on my understanding, the ping pong code is
> > only applicable for command mode panels.
>
> Actually, the ping pong element exists in both modes, but 'pp done
> time out' is a good indicator that it is command mode.
>
> Are you also seeing vblank timeouts?
Yes, here's a snippet of the first one.
[ 2.556014] WARNING: CPU: 0 PID: 5 at drivers/gpu/drm/drm_atomic_helper.c:1429 drm_atomic_helper_wait_for_vblanks.part.1+0x288/0x290
[ 2.556020] [CRTC:49:crtc-0] vblank wait timed out
[ 2.556023] Modules linked in:
[ 2.556034] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.2.0-rc1-00178-g72c3c1fd5f86-dirty #426
[ 2.556038] Hardware name: Generic DT based system
[ 2.556056] Workqueue: events deferred_probe_work_func
...
> Do you have busybox?
>
> Can you run -
> sudo busybox devmem 0xFD900614
> sudo busybox devmem 0xFD900714
> sudo busybox devmem 0xFD900814
> sudo busybox devmem 0xFD900914
> sudo busybox devmem 0xFD900A14
# busybox devmem 0xFD900614
0x00020020
# busybox devmem 0xFD900714
0x00000000
# busybox devmem 0xFD900814
0x00000000
# busybox devmem 0xFD900914
0x00000000
# busybox devmem 0xFD900A14
0x00000000
I get the same values with the mainline kernel and 4.17.
Brian
next prev parent reply other threads:[~2019-05-29 2:46 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-09 2:03 [PATCH RFC v2 0/6] ARM: qcom: initial Nexus 5 display support Brian Masney
2019-05-09 2:03 ` [PATCH v2 1/6] drm: msm: remove resv fields from msm_gem_object struct Brian Masney
2019-05-13 20:32 ` Bjorn Andersson
2019-05-13 22:25 ` Brian Masney
2019-05-09 2:03 ` [PATCH RFC v2 2/6] drm: msm: add dirty framebuffer helper Brian Masney
2019-05-09 2:03 ` [PATCH v2 3/6] ARM: qcom_defconfig: add display-related options Brian Masney
2019-05-09 2:03 ` [PATCH v2 4/6] ARM: dts: msm8974: add display support Brian Masney
2019-05-09 2:03 ` [PATCH v2 5/6] ARM: dts: qcom: msm8974-hammerhead: add support for backlight Brian Masney
2019-05-09 2:03 ` [PATCH v2 6/6] ARM: dts: qcom: msm8974-hammerhead: add support for display Brian Masney
2019-05-09 2:06 ` [PATCH RFC v2 0/6] ARM: qcom: initial Nexus 5 display support Brian Masney
2019-05-28 13:46 ` Linus Walleij
2019-05-29 1:17 ` Brian Masney
2019-05-29 1:32 ` [Freedreno] " Jeffrey Hugo
2019-05-29 1:37 ` Brian Masney
2019-05-29 1:42 ` Jeffrey Hugo
2019-05-29 2:46 ` Brian Masney [this message]
[not found] ` <CAOCk7NpC93ACr4jFm7SBOKSvFJSDhq2byX6BAYPX29BuYEkWnQ@mail.gmail.com>
2019-05-29 10:28 ` Brian Masney
2019-05-29 14:41 ` Jeffrey Hugo
2019-05-29 19:30 ` Brian Masney
2019-05-29 19:58 ` Jeffrey Hugo
2019-05-29 21:54 ` Brian Masney
2019-05-29 2:14 ` Rob Clark
2019-05-29 2:24 ` [Freedreno] " Jeffrey Hugo
2019-05-29 6:23 ` Linus Walleij
2019-05-29 9:41 ` Brian Masney
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