Maxime Ripard [off-list ref] 於 2020年6月29日 週一 下午10:21寫道：

Hi!

On Fri, Jun 05, 2020 at 04:44:51PM +0800, Jian-Hong Pan wrote:

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Maxime Ripard [off-list ref] 於 2020年6月2日 週二 下午7:04寫道：

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Hi,

On Mon, Jun 01, 2020 at 03:58:26PM +0800, Jian-Hong Pan wrote:

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Maxime Ripard [off-list ref] 於 2020年5月28日 週四 下午3:30寫道：

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Hi Daniel,

On Wed, May 27, 2020 at 05:15:12PM +0800, Daniel Drake wrote:

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On Wed, May 27, 2020 at 5:13 PM Maxime Ripard [off-list ref] wrote:

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I'm about to send a v3 today or tomorrow, I can Cc you (and Jian-Hong) if you
want.

That would be great, although given the potentially inconsistent
results we've been seeing so far it would be great if you could
additionally push a git branch somewhere.
That way we can have higher confidence that we are applying exactly
the same patches to the same base etc.

So I sent a new iteration yesterday, and of course forgot to cc you... Sorry for
that.

I've pushed my current branch here:
https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux.git/log/?h=rpi4-kms

Thanks to Maxime!

I have tried your repository on branch rpi4-kms.  The DRM VC4 is used!
But got some issues:
1. Some weird error message in dmesg.  Not sure it is related, or not
[    5.219321] [drm:vc5_hdmi_init_resources] *ERROR* Failed to get
HDMI state machine clock
https://gist.github.com/starnight/3f317dca121065a361cf08e91225e389

That's a deferred probing. The first time the HDMI driver is being
probed, the firmware clock driver has not been probed yet. It's making
another attempt later on, which succeeds.

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2. The screen flashes suddenly sometimes.

I append drm.debug=0x3 to boot command.  Whenever, the screen flashes,
I notice the logs like this:

Jun 01 15:22:40 endless kernel: [drm:drm_calc_timestamping_constants]
crtc 64: hwmode: htotal 2200, vtotal 1125, vdisplay 1080
Jun 01 15:22:40 endless kernel: [drm:drm_calc_timestamping_constants]
crtc 64: clock 148500 kHz framedur 16666666 linedur 14814
Jun 01 15:22:40 endless kernel: [drm:drm_vblank_enable] enabling
vblank on crtc 3, ret: 0
Jun 01 15:22:40 endless kernel: [drm:drm_mode_object_put.part.0] OBJ ID: 159 (2)
Jun 01 15:22:40 endless kernel: [drm:drm_mode_object_put.part.0] OBJ ID: 154 (1)
Jun 01 15:22:40 endless kernel: [drm:vblank_disable_fn] disabling
vblank on crtc 3
Jun 01 15:22:42 endless kernel: [drm:drm_ioctl] pid=584, dev=0xe200,
auth=1, DRM_IOCTL_MODE_CURSOR
Jun 01 15:22:42 endless kernel: [drm:drm_ioctl] pid=584, dev=0xe200,
auth=1, DRM_IOCTL_MODE_CURSOR2
Jun 01 15:22:42 endless kernel: [drm:drm_mode_object_get] OBJ ID: 159 (1)
Jun 01 15:22:42 endless kernel: [drm:drm_mode_object_get] OBJ ID: 154 (1)
Jun 01 15:22:42 endless kernel: [drm:drm_calc_timestamping_constants]
crtc 64: hwmode: htotal 2200, vtotal 1125, vdisplay 1080
Jun 01 15:22:42 endless kernel: [drm:drm_calc_timestamping_constants]
crtc 64: clock 148500 kHz framedur 16666666 linedur 14814
Jun 01 15:22:42 endless kernel: [drm:drm_vblank_enable] enabling
vblank on crtc 3, ret: 0
Jun 01 15:22:42 endless kernel: [drm:drm_mode_object_put.part.0] OBJ ID: 159 (2)
Jun 01 15:22:42 endless kernel: [drm:drm_mode_object_put.part.0] OBJ ID: 154 (2)

Here is the full log
https://gist.github.com/starnight/85d641819839eddc7a55ca7173990a56

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3. The higher resolutions, like 1920x1080 ... are lost after hot
re-plug HDMI cable (HDMI0)

I should explain this in more detail.  Here are the steps to reproduce
this issue:
1. Before unplug the HDMI cable from HDMI0 port.
$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 2048 x 2048
HDMI-1 connected primary 1920x1080+0+0 (normal left inverted right x
axis y axis) 521mm x 293mm
   1920x1080     60.00*+  50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1680x1050     59.88
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x960      60.00
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1440x576      50.00
   1024x768      75.03    70.07    60.00
   1440x480      60.00    59.94
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
HDMI-2 disconnected (normal left inverted right x axis y axis)

2. Unplug the HDMI cable from HDMI0 port.
3. Plug the HDMI cable to **HDMI1** port.
$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 2048 x 2048
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 connected primary 1920x1080+0+0 (normal left inverted right x
axis y axis) 521mm x 293mm
   1920x1080     60.00*+  50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1680x1050     59.88
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x960      60.00
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1440x576      50.00
   1024x768      75.03    70.07    60.00
   1440x480      60.00    59.94
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08

4. Unplug the HDMI cable from **HDMI1** port.
5. Plug the HDMI cable back to HDMI0 port.
$ xrandr
Screen 0: minimum 320 x 200, current 1368 x 768, maximum 2048 x 2048
HDMI-1 connected primary 1368x768+0+0 (normal left inverted right x
axis y axis) 0mm x 0mm
   1368x768      59.88*
   1360x768      59.80
   1280x800      59.81
   1152x864      60.00
   1280x720      59.86
   1024x768      60.00
   1024x576      59.90
   960x540       59.63
   800x600       60.32
   800x450       59.82
   700x450       59.88
   640x480       59.94
   684x384       59.88    59.85
   680x384       59.80    59.96
   640x400       59.88    59.98
   576x432       60.06
   640x360       59.86    59.83
   512x384       60.00
   512x288       60.00    59.92
   480x270       59.63    59.82
   400x300       60.32
   320x240       60.05
HDMI-2 disconnected (normal left inverted right x axis y axis)

Sorry for getting back at it so late. I just tested with modetest only
and my current branch and it seems to behave properly. Did you had to
run X to get that issue, or is it just how you noticed it?

Also, was that with the branch based on 5.7 I pushed on my git tree on
kernel.org or some earlier revision of the series?

Thanks for coming back :)

I use GNOME 3.36 with Xorg 1.20.4.

To understand when it starts to hit the issues, I separate to step by step:
1. System boots into command line mode first (systemd multi-user.target)
2. Execute Xorg, then xterm.
3. Execute mutter upon the screen of Xorg.

I tried both branches rpi4-kms and rpi4-kms-5.7 of
https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux.git
Both of the branches hit issues:
* The screen flashes suddenly sometimes.  This happens after mutter is launched.
* The higher resolutions, like 1920x1080 ... are lost after hot
re-plug HDMI cable (HDMI0).  HDMI cable connects to HDMI0 -> HDMI1 ->
HDMI0.  This happens not only with GNOME, but also pure Xorg.

Jian-Hong Pan

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