[alsa-devel] [PATCH v2 00/11] drm/i915: LPE audio runtime PM and multipipe (v2)

[Pierre-Louis Bossart]

On 04/28/2017 03:41 AM, Takashi Iwai wrote:
> On Thu, 27 Apr 2017 18:02:19 +0200,
> ville.syrjala at linux.intel.com wrote:
>> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>>
>> Okay, here's the second attempt at getting multiple pipes playing back
>> audio on the VLV/CHV HDMI LPE audio device. The main change from v1 is
>> that now the PCM devices are associated with ports instead of pipes,
>> so the audio from one device always gets output on the same display.
>>
>> I've also tacked on the alsa-lib conf update. No clue whether it's
>> really correct or not (the config language isn't a close friend
>> of mine).
>>
>> BTW I did notice that with LPE audio all the controls say iface=PCM,
>> whereas on HDA a bunch of them say iface=MIXER. No idea if that's
>> OK or not, just something I spotted when I was comparing the results
>> with HDA.
> We generally accept both iface types for IEC958 stuff, since
> historically many drivers have already mixed them up.  So it's no
> problem :)
>
>
>> Entire series available here:
>> git://github.com/vsyrjala/linux.git lpe_audio_multipipe_2
>>
>> Cc: Takashi Iwai <tiwai at suse.de>
>> Cc: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> All look good, and feel free to take my reviewed-by tag
>    Reviewed-by: Takashi Iwai <tiwai at suse.de>
>
> As said previously, my only slight concern is the compatibility.
> But, in the current situation with PulseAudio, only few people would
> use this driver, so it shouldn't be so big impact, I suppose.
>
> BTW, which port is used in general on BYT/CHT?
>
> Oh, also, I suppose you want to carry these over i915 tree?
> I don't mind either way, I can take them through sound tree if
> preferred, too.
I see frequent oops on startup with this lpe_audio_multipipe_2 branch 
with my CHT device not booting or no HDMI audio device created.
Not sure if these issues are due to the new patches or to the rest of 
the drm code?

[    5.529023] BUG: unable to handle kernel NULL pointer dereference 
at           (null)
[    5.529143] IP: hdmi_lpe_audio_probe+0x40f/0x650 [snd_hdmi_lpe_audio]
[    5.529202] PGD 0

[    5.529242] Oops: 0000 [#1] SMP
[    5.529274] Modules linked in: snd_soc_sst_atom_hifi2_platform 
snd_soc_sst_match snd_soc_core snd_compress lpc_ich snd_seq 
snd_seq_device shpchp snd_hdmi_lpe_audio(+) snd_pcm snd_timer dw_dmac 
snd soundcore i2c_designware_platform(+) i2c_designware_core 
spi_pxa2xx_platform acpi_pad mac_hid nfsd auth_rpcgss nfs_acl lockd 
grace sunrpc ip_tables x_tables hid_generic mmc_block i2c_hid usbhid hid 
autofs4
[    5.529605] CPU: 2 PID: 512 Comm: systemd-udevd Not tainted 
4.11.0-rc8-test+ #11
[    5.529671] Hardware name: ZOTAC XXXXXX/Cherry Trail FFD, BIOS 5.11 
09/28/2016
[    5.529736] task: ffff88007485b780 task.stack: ffffc90000bfc000
[    5.529793] RIP: 0010:hdmi_lpe_audio_probe+0x40f/0x650 
[snd_hdmi_lpe_audio]
[    5.529855] RSP: 0018:ffffc90000bffaf0 EFLAGS: 00010246
[    5.529904] RAX: 0000000000000000 RBX: ffff880079209898 RCX: 
ffff88007920f078
[    5.529967] RDX: 0000000000000014 RSI: ffffc90000bffb28 RDI: 
0000000000000002
[    5.530031] RBP: ffffc90000bffb70 R08: 0000000000000001 R09: 
0000000000000000
[    5.530094] R10: ffff88007441bf00 R11: ffffc90000bffb36 R12: 
ffff88007920ef20
[    5.530159] R13: ffff88007920ef48 R14: 0000000000005688 R15: 
0000000000000047
[    5.530225] FS:  00007f627c988640(0000) GS:ffff88007b300000(0000) 
knlGS:0000000000000000
[    5.530299] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.530352] CR2: 0000000000000000 CR3: 0000000078cb8000 CR4: 
00000000001006e0
[    5.530416] Call Trace:
[    5.530452]  platform_drv_probe+0x3b/0xa0
[    5.530494]  driver_probe_device+0x2bb/0x460
[    5.530538]  __driver_attach+0xdf/0xf0
[    5.530576]  ? driver_probe_device+0x460/0x460
[    5.530620]  bus_for_each_dev+0x60/0xa0
[    5.530658]  driver_attach+0x1e/0x20
[    5.530693]  bus_add_driver+0x170/0x270
[    5.530731]  driver_register+0x60/0xe0
[    5.530769]  ? 0xffffffffa01cb000
[    5.530803]  __platform_driver_register+0x36/0x40
[    5.530851]  hdmi_lpe_audio_driver_init+0x17/0x1000 [snd_hdmi_lpe_audio]
[    5.530915]  do_one_initcall+0x43/0x180
[    5.530956]  ? __vunmap+0x81/0xd0
[    5.530991]  ? kfree+0x14c/0x160
[    5.531024]  ? kmem_cache_alloc_trace+0x38/0x150
[    5.531070]  do_init_module+0x5f/0x1f8
[    5.531108]  load_module+0x271e/0x2bd0
[    5.531147]  ? kernel_read_file+0x1a3/0x1c0
[    5.531188]  SYSC_finit_module+0xbc/0xf0
[    5.531226]  ? SYSC_finit_module+0xbc/0xf0
[    5.531267]  SyS_finit_module+0xe/0x10
[    5.531305]  do_syscall_64+0x6e/0x180
[    5.531345]  entry_SYSCALL64_slow_path+0x25/0x25
[    5.531389] RIP: 0033:0x7f627b5fbbf9
[    5.531424] RSP: 002b:00007ffe053eee68 EFLAGS: 00000246 ORIG_RAX: 
0000000000000139
[    5.531493] RAX: ffffffffffffffda RBX: 000055d6c745b690 RCX: 
00007f627b5fbbf9
[    5.531558] RDX: 0000000000000000 RSI: 00007f627c134995 RDI: 
0000000000000007
[    5.531622] RBP: 00007f627c134995 R08: 0000000000000000 R09: 
00007ffe053eef80
[    5.531687] R10: 0000000000000007 R11: 0000000000000246 R12: 
0000000000000000
[    5.531751] R13: 000055d6c7459ae0 R14: 0000000000020000 R15: 
000055d6c745b690
[    5.531816] Code: 48 8b 45 b0 8b 48 18 e8 e0 cb 22 e1 49 8b 44 24 28 
4a 8d 8c 33 58 01 00 00 48 8d 75 b8 45 31 c9 41 b8 01 00 00 00 ba 14 00 
00 00 <48> 8b 38 e8 a9 2a ff ff 85 c0 0f 88 09 01 00 00 49 8b 84 24 58
[    5.532026] RIP: hdmi_lpe_audio_probe+0x40f/0x650 
[snd_hdmi_lpe_audio] RSP: ffffc90000bffaf0
[    5.532101] CR2: 0000000000000000
[    5.532168] ---[ end trace e832e97f0e744700 ]---
[    5.534830] i2c i2c-8: i2c read failed
[    5.554395] i2c i2c-8: i2c read failed