drm/vc4: module dysfunctional on Raspberry Pi 3B as of 5.18.0

[Stefan Wahren]

Hi,

Am 08.06.22 um 16:36 schrieb Maxime Ripard:
> Hi Peter(s)
>
> On Wed, Jun 08, 2022 at 02:10:19PM +0100, Peter Robinson wrote:
>> Hi Peter,
>>
>> Adding Stefan and Maxime
>>
>>> As of Linux 5.18.0, module vc4 apparently isn't working on Raspberry Pi
>>> 3B any more.
>>>
>>> If a monitor is attached to the device, the boot messages show up as
>>> usual, but right when KMS starts, the screen turns black. Similarly, the
>>> screen also turns black when the module is blacklisted at boot time and
>>> loaded from the running system.
>>> The problem looks quite similar to the one posted some months ago in [1].
> If I understand you properly, it results in a blank screen if the
> monitor is connected, but the system is still responsive?
>
> If so, it's a very different problem than the link you provided, since
> it was occurring when no monitor was connected and resulted in a total
> system hang.
>
>>> Unfortunately, looking through systemd's journal didn't seem to yield
>>> any real hint. Nevertheless, the results from grepping vc4 are
>> I'm seeing the same issue with vc4 on a RPi3 on 5.18.1 on Fedora so
>> can confirm the regression. Maxime would know what might be up here?

i assume you are using the downstream DTB?


Please provide the version/date of the GPU firmware?

> I tested on 5.18 on my 3B and it works well. Could you paste your kernel
> configuration and config.txt somewhere?
>
>>> → 5.17.1
>>>   > kernel: vc4-drm soc:gpu: bound 3f400000.hvs (ops vc4_hvs_ops [vc4])
>>>   > kernel: rc rc0: vc4 as /devices/platform/soc/3f902000.hdmi/rc/rc0
>>>   > kernel: input: vc4 as /devices/platform/soc/3f902000.hdmi/rc/rc0/input0
>>>   > kernel: vc4-drm soc:gpu: bound 3f902000.hdmi (ops vc4_hdmi_ops [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f806000.vec (ops vc4_vec_ops [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f004000.txp (ops vc4_txp_ops [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f206000.pixelvalve (ops vc4_crtc_ops
>>> [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f207000.pixelvalve (ops vc4_crtc_ops
>>> [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f807000.pixelvalve (ops vc4_crtc_ops
>>> [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3fc00000.v3d (ops vc4_v3d_ops [vc4])
>>>   > kernel: fb0: switching to vc4 from simple
>>>   > kernel: [drm] Initialized vc4 0.0.0 20140616 for soc:gpu on minor 0
>>>   > kernel: vc4-drm soc:gpu: [drm] fb0: vc4drmfb frame buffer device
>>>   > systemd-logind[338]: Watching system buttons on /dev/input/event0 (vc4)
>>> → 5.18.0
>>>   > kernel: fb0: switching to vc4 from simple
>>>   > kernel: vc4-drm soc:gpu: bound 3f400000.hvs (ops vc4_hvs_ops [vc4])
>>>   > kernel: rc rc0: vc4 as /devices/platform/soc/3f902000.hdmi/rc/rc0
>>>   > kernel: input: vc4 as /devices/platform/soc/3f902000.hdmi/rc/rc0/input0
>>>   > kernel: vc4-drm soc:gpu: bound 3f902000.hdmi (ops vc4_hdmi_ops [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f806000.vec (ops vc4_vec_ops [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f004000.txp (ops vc4_txp_ops [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f206000.pixelvalve (ops vc4_crtc_ops
>>> [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f207000.pixelvalve (ops vc4_crtc_ops
>>> [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3f807000.pixelvalve (ops vc4_crtc_ops
>>> [vc4])
>>>   > kernel: vc4-drm soc:gpu: bound 3fc00000.v3d (ops vc4_v3d_ops [vc4])
>>>   > kernel: [drm] Initialized vc4 0.0.0 20140616 for soc:gpu on minor 0
>>>   > kernel: vc4-drm soc:gpu: [drm] fb0: vc4drmfb frame buffer device
>>>   > systemd-logind[337]: Watching system buttons on /dev/input/event0 (vc4)
> Yeah, it doesn't look that different.
>
> Maxime