wm8775 9-001b: I2C: cannot write ??? to register R??

Booting current git kernel dmesg shows a set of new warnings:

    "wm8775 9-001b: I2C: cannot write ??? to register R??"

Nevertheless, the hardware seems to work fine.

This is a new problem, introduced after kernel 3.10. If necessary I can bisect.

dmesg snippet:

[   11.841431] Linux video capture interface: v2.00
[   11.972078] cx88/2: cx2388x MPEG-TS Driver Manager version 0.0.9 loaded
[   11.998497] cx88/0: cx2388x v4l2 driver version 0.0.9 loaded
[   12.035020] cx88[0]: subsystem: 0070:6906, board: Hauppauge WinTV-HVR4000(Lite) DVB-S/S2 [card=69,autodetected], frontend(s): 1
[   12.227528] Adding 7119316k swap on /dev/sda3.  Priority:-1 extents:1 across:7119316k SS
[   12.707144] snd_hda_intel 0000:00:1b.0: irq 46 for MSI/MSI-X
[   12.709339] tveeprom 9-0050: Hauppauge model 69100, rev B4C3, serial# 7900937
[   12.713245] tveeprom 9-0050: MAC address is 00:0d:fe:78:8f:09
[   12.716836] tveeprom 9-0050: tuner model is Conexant CX24118A (idx 123, type 4)
[   12.720783] tveeprom 9-0050: TV standards ATSC/DVB Digital (eeprom 0x80)
[   12.727678] tveeprom 9-0050: audio processor is None (idx 0)
[   12.731462] tveeprom 9-0050: decoder processor is CX880 (idx 20)
[   12.736219] tveeprom 9-0050: has no radio, has IR receiver, has no IR transmitter
[   12.741662] cx88[0]: hauppauge eeprom: model=69100
[   12.749368] ALSA sound/pci/hda/hda_auto_parser.c:393 autoconfig: line_outs=3 (0x14/0x17/0x16/0x0/0x0) type:line
[   12.749375] ALSA sound/pci/hda/hda_auto_parser.c:397 speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[   12.749380] ALSA sound/pci/hda/hda_auto_parser.c:401    hp_outs=1 (0x19/0x0/0x0/0x0/0x0)
[   12.749384] ALSA sound/pci/hda/hda_auto_parser.c:402    mono: mono_out=0x0
[   12.749388] ALSA sound/pci/hda/hda_auto_parser.c:405 dig-out=0x1e/0x0
[   12.749391] ALSA sound/pci/hda/hda_auto_parser.c:406    inputs:
[   12.749396] ALSA sound/pci/hda/hda_auto_parser.c:410      Rear Mic=0x18
[   12.749400] ALSA sound/pci/hda/hda_auto_parser.c:410      Front Mic=0x1b
[   12.749404] ALSA sound/pci/hda/hda_auto_parser.c:410 Line=0x1a
[   12.749408] ALSA sound/pci/hda/patch_realtek.c:490 realtek: No valid SSID, checking pincfg 0x411111f0 for NID 0x1d
[   12.749412] ALSA sound/pci/hda/patch_realtek.c:573 realtek: Enable default setup for auto mode as fallback
[   12.753148] input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/input/input5
[   12.768712] input: HDA Intel Line Out CLFE as /devices/pci0000:00/0000:00:1b.0/sound/card0/input6
[   12.774247] input: HDA Intel Line Out Surround as /devices/pci0000:00/0000:00:1b.0/sound/card0/input7
[   12.778535] input: HDA Intel Line Out Front as /devices/pci0000:00/0000:00:1b.0/sound/card0/input8
[   12.782526] input: HDA Intel Line as /devices/pci0000:00/0000:00:1b.0/sound/card0/input9
[   12.786746] input: HDA Intel Front Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
[   12.791001] input: HDA Intel Rear Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
[   12.796098] Registered IR keymap rc-hauppauge
[   12.803188] input: cx88 IR (Hauppauge WinTV-HVR400 as /devices/pci0000:00/0000:00:1e.0/0000:05:05.2/rc/rc0/input12
[   12.809256] rc0: cx88 IR (Hauppauge WinTV-HVR400 as /devices/pci0000:00/0000:00:1e.0/0000:05:05.2/rc/rc0
[   12.864326] IR RC5(x) protocol handler initialized
[   12.871896] cx88[0]/2: cx2388x 8802 Driver Manager
[   12.876574] cx88[0]/2: found at 0000:05:05.2, rev: 5, irq: 17, latency: 32, mmio: 0xd2000000
[   12.881395] lirc_dev: IR Remote Control driver registered, major 250
[   12.887849] cx88[0]/0: found at 0000:05:05.0, rev: 5, irq: 17, latency: 32, mmio: 0xd0000000
[   12.894323] rc rc0: lirc_dev: driver ir-lirc-codec (cx88xx) registered at minor = 0
[   12.904754] IR LIRC bridge handler initialized
[   12.926877] wm8775 9-001b: chip found @ 0x36 (cx88[0])
[   12.935488] cx88/2: cx2388x dvb driver version 0.0.9 loaded
[   12.942346] cx88/2: registering cx8802 driver, type: dvb access: shared
[   12.948247] cx88[0]/2: subsystem: 0070:6906, board: Hauppauge WinTV-HVR4000(Lite) DVB-S/S2 [card=69]
[   12.956345] cx88[0]/2: cx2388x based DVB/ATSC card
[   12.966600] cx8802_alloc_frontends() allocating 1 frontend(s)
[   12.971340] wm8775 9-001b: I2C: cannot write 000 to register R23
[   13.001070] DVB: registering new adapter (cx88[0])
[   13.008323] cx88-mpeg driver manager 0000:05:05.2: DVB: registering adapter 0 frontend 0 (Conexant CX24116/CX24118)...
[   13.045893] wm8775 9-001b: I2C: cannot write 000 to register R7
[   13.057800] wm8775 9-001b: I2C: cannot write 021 to register R11
[   13.076171] wm8775 9-001b: I2C: cannot write 102 to register R12
[   13.086551] wm8775 9-001b: I2C: cannot write 000 to register R13
[   13.094695] wm8775 9-001b: I2C: cannot write 1d4 to register R14
[   13.112437] wm8775 9-001b: I2C: cannot write 1d4 to register R15
[   13.122719] wm8775 9-001b: I2C: cannot write 1bf to register R16
[   13.136414] wm8775 9-001b: I2C: cannot write 185 to register R17
[   13.146144] wm8775 9-001b: I2C: cannot write 0a2 to register R18
[   13.152412] wm8775 9-001b: I2C: cannot write 005 to register R19
[   13.167831] wm8775 9-001b: I2C: cannot write 07a to register R20
[   13.174097] wm8775 9-001b: I2C: cannot write 102 to register R21
[   13.184269] wm8775 9-001b: I2C: cannot write 0c2 to register R21
[   13.195566] wm8775 9-001b: I2C: cannot write 1cf to register R14
[   13.201645] wm8775 9-001b: I2C: cannot write 1cf to register R15
[   13.211898] wm8775 9-001b: I2C: cannot write 0c2 to register R21
[   13.217832] wm8775 9-001b: I2C: cannot write 1cf to register R14
[   13.226794] wm8775 9-001b: I2C: cannot write 1cf to register R15
[   13.240810] wm8775 9-001b: I2C: cannot write 0c2 to register R21
[   13.249220] wm8775 9-001b: I2C: cannot write 1cf to register R14
[   13.256881] wm8775 9-001b: I2C: cannot write 1cf to register R15
[   13.274529] cx88[0]/0: registered device video0 [v4l2]
[   13.279167] cx88[0]/0: registered device vbi0

Hardware:
========

Hauppauge WinTV Nova HD-S2,
installed on AOpen i915GMm-hfs mobo,
2GB RAM, 2GHz Pentium-M Dothan

lspci -vv::

05:05.0 Multimedia video controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
Subsystem: Hauppauge computer works Inc. Device 6906
Flags: bus master, medium devsel, latency 32, IRQ 17
Memory at d0000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: [44] Vital Product Data
Capabilities: [4c] Power Management version 2
Kernel driver in use: cx8800

05:05.1 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 05)
Subsystem: Hauppauge computer works Inc. Device 6906
Flags: bus master, medium devsel, latency 32, IRQ 12
Memory at d1000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: [4c] Power Management version 2

05:05.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [MPEG Port] (rev 05)
Subsystem: Hauppauge computer works Inc. Device 6906
Flags: bus master, medium devsel, latency 32, IRQ 17
Memory at d2000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: [4c] Power Management version 2
Kernel driver in use: cx88-mpeg driver manager

05:05.4 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [IR Port] (rev 05)
Subsystem: Hauppauge computer works Inc. Device 6906
Flags: bus master, medium devsel, latency 32, IRQ 12
Memory at d3000000 (32-bit, non-prefetchable) [size=16M]
Capabilities: [4c] Power Management version 2

cu,
Knut

Can you try this patch? I'm pretty sure this will fix it.

Regards,

Hans

index afe0eae..28893a6 100644
@@ -259,7 +259,7 @@ struct cx88_input {
 };
 
 enum cx88_audio_chip {
-	CX88_AUDIO_WM8775,
+	CX88_AUDIO_WM8775 = 1,
 	CX88_AUDIO_TVAUDIO,
 };
 

Indeed, it does cure the problem. Thanks.

Thanks for testing this! I've posted the pull request for this. Hopefully it will make 3.11 before it is released.

Regards,

Hans

As I wrote in the initial bug report, the problem has been introduced _after_ kernel 3.10, facd23664f1d63c33fbc6da52261c8548ed3fbd4 is _not_ part of kernel 3.10.x

Therefore the CC to [email protected] for v3.10 in b9a1dfd3ba3ae00b0c1d1a396ed43fac85a32990 is wrong.

cu,
Knut

Hi Linus!

It would be nice to have head cx88fix of git.linuxtv.org/hverkuil/media_tree.git (git.linuxtv.org/hverkuil/media_tree.git/commit/5dce3635bf803cfe9dde84e00f5f9594439e6c02) in 3.11 as it is a trivial and tested fix for a regression introduced between 3.10 and 3.11-rc1.

see http://www.gossamer-threads.com/lists/linux/kernel/1771751?#1771751

cu,
Knut

I can't take partial pull requests - I can take individual patches from email (with proper sign-off chains etc, of course), but I don't do "take this patch from this git tree". Git pulls need to go through the tree owner and with all the normal pull request rules, and the rest of that tree doesn't look critical.

Linus