On Fri, 02 Oct 2026 10:36:42 -0300, Maíra Canal wrote:
> While testing Raspberry Pi 4 HDMI hotplug with drm-misc-fixes, I hit the
> following warning:
>
> [ 201.570266] ------------[ cut here ]------------
> [ 201.570293] Packet RAM has to be on to store the packet.
> [ 201.570367] WARNING: drivers/gpu/drm/vc4/vc4_hdmi.c:683 at
> vc4_hdmi_write_infoframe+0x404/0x494 [vc4], CPU#0: wireplumber/1606
> [...]
> [ 201.658650] Hardware name: Raspberry Pi 4 Model B Rev 1.5 (DT)
> [...]
> [ 201.758499] Call trace:
> [ 201.760967] vc4_hdmi_write_infoframe+0x404/0x494 [vc4] (P)
> [ 201.766607] vc4_hdmi_write_audio_infoframe+0x1c/0x28 [vc4]
> [ 201.772247] write_infoframe+0xbc/0x140 [drm_display_helper]
> [ 201.777975]
> drm_atomic_helper_connector_hdmi_update_audio_infoframe+0x80/0xdc
> [drm_display_helper]
> [ 201.787140] vc4_hdmi_audio_prepare+0x4ac/0x570 [vc4]
> [ 201.792252] drm_connector_hdmi_audio_prepare+0x24/0x30
> [drm_display_helper]
> [ 201.799390] hdmi_codec_prepare+0x100/0x160 [snd_soc_hdmi_codec]
> [ 201.805471] snd_soc_pcm_dai_prepare+0xd4/0x100 [snd_soc_core]
> [ 201.811375] __soc_pcm_prepare+0x60/0x12c [snd_soc_core]
> [ 201.816752] soc_pcm_prepare+0x34/0x58 [snd_soc_core]
> [ 201.821863] snd_pcm_do_prepare+0x70/0x8c [snd_pcm]
> [ 201.826798] snd_pcm_action_nonatomic+0xe4/0x174 [snd_pcm]
> [ 201.832350] snd_pcm_prepare+0xc8/0xd8 [snd_pcm]
> [ 201.837021] snd_pcm_common_ioctl+0x458/0x614 [snd_pcm]
> [ 201.842308] snd_pcm_ioctl+0x30/0x48 [snd_pcm]
> [ 201.846802] __arm64_sys_ioctl+0x88/0xd8
> [ 201.850769] invoke_syscall+0x48/0xf4
> [ 201.854470] el0_svc_common+0x80/0xd8
> [ 201.858171] do_el0_svc+0x1c/0x28
> [ 201.861520] el0_svc+0x3c/0xb0
> [ 201.864605] el0t_64_sync_handler+0x68/0xdc
> [ 201.868834] el0t_64_sync+0x198/0x19c
> [ 201.872536] ---[ end trace 0000000000000000 ]---
>
> [...]
Applied to drm-misc-fixes, thanks!
[1/2] drm/vc4: hdmi: Move packet RAM enable to PM runtime
commit: 3f57b34485dc01e5a2db60a89a6ae5439a897e53
I'll apply the second patch to drm-misc-next after the backport.
Best regards,
- Maíra
