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* ALSA: firewire-lib: tune the minimum available size of PCM periodTakashi Sakamoto2019-10-181-1/+13
| | | | | | | | | | | | | | | | | | | | In IEC 61883-1/6, one isoc packet can transfer events up to the value of syt interval. This comes from the interval of isoc cycle. As 1394 OHCI controller can generate hardware IRQ per isoc packet, the interval is calculated as 125 usec. In IEC 61883-1/6, two ways of transmission is described; blocking and non-blocking methods. In blocking method, the sequence of packet includes 'empty' or 'NODATA' packets which include no events. In non-blocking method, the number of events per packet is variable up to the syt interval. This commit uses double of the value of syt interval as minimum available size of PCM period due to the above protocol design. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-13-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-lib: tune the maximum available size of PCM periodTakashi Sakamoto2019-10-181-11/+18
| | | | | | | | | | | | | | Linux driver for 1394 OHCI controller voluntarily flushes isoc context when total size of accumulated context header reached PAGE_SIZE. This kicks tasklet for the isoc context. This is inconvenient to process runtime of PCM substream. This commit adds a restriction of the maximum size of PCM period to avoid this behaviour. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-12-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-lib: schedule hardware IRQ according to the size of PCM periodTakashi Sakamoto2019-10-182-15/+58
| | | | | | | | | | | | | | | | | ALSA IEC 61883-1/6 packet streaming engine controls 1394 OHCI controller to generate hardware IRQ for fixed number of isochronous packets (=16) since its first commit. This commit allow the engine to generate it for variable period according to the number of event to handle. For outgoing stream, internal calculator is used to check the accumulated events. For incoming stream, the number of data block in the packet of stream is used to check the accumulated events. When it's unavailable, fixed number of packet roughly calculated in advance is used instead of event counting. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-11-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: fireface: share PCM buffer size for both directionTakashi Sakamoto2019-10-183-4/+17
| | | | | | | | | | | | | This commit allows ALSA fireface driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-10-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: share PCM buffer size for both directionTakashi Sakamoto2019-10-184-5/+17
| | | | | | | | | | | | | This commit allows ALSA firewire-motu driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-9-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-tascam: share PCM buffer size for both directionTakashi Sakamoto2019-10-183-4/+16
| | | | | | | | | | | | | This commit allows ALSA firewire-tascam driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-8-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-digi00x: share PCM buffer size for both directionTakashi Sakamoto2019-10-184-5/+17
| | | | | | | | | | | | | This commit allows ALSA firewire-digi00x driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-7-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: dice: share PCM buffer size for both directionTakashi Sakamoto2019-10-184-7/+23
| | | | | | | | | | | | | This commit allows ALSA dice driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-6-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: oxfw: share PCM buffer size for both directionTakashi Sakamoto2019-10-184-7/+22
| | | | | | | | | | | | | This commit allows ALSA oxfw driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-5-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: fireworks: share PCM buffer size for both directionTakashi Sakamoto2019-10-184-5/+17
| | | | | | | | | | | | | This commit allows ALSA fireworks driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-4-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: bebob: share PCM buffer size for both directionTakashi Sakamoto2019-10-184-5/+17
| | | | | | | | | | | | | This commit allows ALSA bebob driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-3-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-lib: use variable size of queue for isoc packets instead of ↵Takashi Sakamoto2019-10-1810-26/+41
| | | | | | | | | | | | | | | | | fixed size The number of packets in packet buffer has been fixed number (=48) since first commit of ALSA IEC 61883-1/6 packet streaming engine. This commit allows the engine to use variable number of packets in the buffer. The size is calculated by a parameter in AMDTP domain structure surely to store the number of events in the packets of buffer. Although the value of parameter is expected to come from 'period size' parameter of PCM substream, at present 48 is still used. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-2-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: fireface: use the same size of period for PCM substreams in AMDTP streamsTakashi Sakamoto2019-10-171-6/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This commit replaces the check with the substream count and the value for the size of PCM period. Unlike the other drivers in ALSA firewire stack, no MIDI substream is multiplexed into AMDTP stream. I note that Fireface AMDTP protocol has a quirk that tx stream includes blank isochronous cycle. The packet for blank cycle is equivalent to empty or NODATA packet in IEC 61883-6, thus the protocol is similar to blocking transmission method of IEC 61883-6. On the other hand, rx stream adopts non-blocking transmission method. Although the difference of transmission method between tx/rx streams precisely brings different timing for a certain amount of events due to their different calculation for data blocks per packet, it's possible to approximate enough amount of events mostly has the same timing. Actually current ALSA IEC 61883-1/6 engine uses large amount of data blocks for each hardware IRQ (=16 packets). Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-18-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: use the same size of period for PCM substream in AMDTP ↵Takashi Sakamoto2019-10-171-8/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | streams In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams and MIDI substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This idea has one issue because it's incremented for MIDI substreams as well. In current implementation, for a case that any MIDI substream run and a PCM substream is going to start, PCM application to start the PCM substream can decide hardware parameters by restart packet streaming. Just checking the substream count can brings regression. Now AMDTP domain structure has a member for the size of PCM period in PCM substream which starts AMDTP streams in domain. When the value has zero and the substream count is greater than 1, it means that any MIDI substream starts AMDTP streams in domain. Usage of the value can resolve the above issue. This commit replaces the check with the substream count and the value for the size of PCM period. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-17-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-tascam: use the same size of period for PCM substream in ↵Takashi Sakamoto2019-10-171-8/+26
| | | | | | | | | | | | | | | | | | | | | AMDTP streams In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This commit replaces the check with the substream count and the value for the size of PCM period. Unlike the other drivers in ALSA firewire stack, no MIDI substream is multiplexed into AMDTP stream. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-16-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-digi00x: use the same size of period for PCM substream in ↵Takashi Sakamoto2019-10-171-7/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | AMDTP streams In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams and MIDI substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This idea has one issue because it's incremented for MIDI substreams as well. In current implementation, for a case that any MIDI substream run and a PCM substream is going to start, PCM application to start the PCM substream can decide hardware parameters by restart packet streaming. Just checking the substream count can brings regression. Now AMDTP domain structure has a member for the size of PCM period in PCM substream which starts AMDTP streams in domain. When the value has zero and the substream count is greater than 1, it means that any MIDI substream starts AMDTP streams in domain. Usage of the value can resolve the above issue. This commit replaces the check with the substream count and the value for the size of PCM period. I note that DOT AMDTP protocol has a quirk to use different transmission method of IEC 61883-6 for tx/rx streams; non-blocking in tx stream and blocking in rx stream. Although the difference of transmission method between tx/rx streams precisely brings different timing for a certain amount of events due to their different calculation for data blocks per packet, it's possible to approximate enough amount of events mostly has the same timing. Actually current ALSA IEC 61883-1/6 engine uses large amount of data blocks for each hardware IRQ (=16 packets). Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-15-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: dice: use the same size of period for PCM substream in AMDTP streamsTakashi Sakamoto2019-10-171-12/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams and MIDI substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This idea has one issue because it's incremented for MIDI substreams as well. In current implementation, for a case that any MIDI substream run and a PCM substream is going to start, PCM application to start the PCM substream can decide hardware parameters by restart packet streaming. Just checking the substream count can brings regression. Now AMDTP domain structure has a member for the size of PCM period in PCM substream which starts AMDTP streams in domain. When the value has zero and the substream count is greater than 1, it means that any MIDI substream starts AMDTP streams in domain. Usage of the value can resolve the above issue. This commit replaces the check with the substream count and the value for the size of PCM period. Dice hardware has a quirk called as 'Dual Wire'. For a case of higher sampling transmission frequency, this commit performs calculations between the number of PCM frames and the number of events in AMDTP stream. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-14-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: oxfw: use the same size of period for PCM substream in AMDTP streamsTakashi Sakamoto2019-10-171-11/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams and MIDI substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This idea has one issue because it's incremented for MIDI substreams as well. In current implementation, for a case that any MIDI substream run and a PCM substream is going to start, PCM application to start the PCM substream can decide hardware parameters by restart packet streaming. Just checking the substream count can brings regression. Now AMDTP domain structure has a member for the size of PCM period in PCM substream which starts AMDTP streams in domain. When the value has zero and the substream count is greater than 1, it means that any MIDI substream starts AMDTP streams in domain. Usage of the value can resolve the above issue. This commit replaces the check with the substream count and the value for the size of PCM period. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-13-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: fireworks: use the same size of period for PCM substream in AMDTP streamsTakashi Sakamoto2019-10-171-11/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams and MIDI substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This idea has one issue because it's incremented for MIDI substreams as well. In current implementation, for a case that any MIDI substream run and a PCM substream is going to start, PCM application to start the PCM substream can decide hardware parameters by restart packet streaming. Just checking the substream count can brings regression. Now AMDTP domain structure has a member for the size of PCM period in PCM substream which starts AMDTP streams in domain. When the value has zero and the substream count is greater than 1, it means that any MIDI substream starts AMDTP streams in domain. Usage of the value can resolve the above issue. This commit replaces the check with the substream count and the value for the size of PCM period. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-12-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: bebob: use the same size of period for PCM substream in AMDTP streamsTakashi Sakamoto2019-10-171-12/+27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In current implementation, when opening a PCM substream, it's needed to check whether the opposite PCM substream runs. This is to assign effectual constraints (e.g. sampling rate) to opened PCM substream. The number of PCM substreams and MIDI substreams on AMDTP streams in domain is recorded in own structure. Usage of this count is an alternative of the above check. This is better because the count is incremented in pcm.hw_params earlier than pcm.trigger. This idea has one issue because it's incremented for MIDI substreams as well. In current implementation, for a case that any MIDI substream run and a PCM substream is going to start, PCM application to start the PCM substream can decide hardware parameters by restart packet streaming. Just checking the substream count can brings regression. Now AMDTP domain structure has a member for the size of PCM period in PCM substream which starts AMDTP streams in domain. When the value has zero and the substream count is greater than 1, it means that any MIDI substream starts AMDTP streams in domain. Usage of the value can resolve the above issue. This commit replaces the check with the substream count and the value for the size of PCM period. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-11-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: fireface: register the size of PCM period to AMDTP domainTakashi Sakamoto2019-10-173-3/+14
| | | | | | | | | | | This commit is a preparation to share the size of PCM period between PCM substreams on AMDTP streams in the same domain. At this time, the size of PCM period in PCM substream which starts AMDTP streams in the same domain is recorded. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-10-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-motu: register the size of PCM period to AMDTP domainTakashi Sakamoto2019-10-174-4/+16
| | | | | | | | | | | This commit is a preparation to share the size of PCM period between PCM substreams on AMDTP streams in the same domain. At this time, the size of PCM period in PCM substream which starts AMDTP streams in the same domain is recorded. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-9-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-tascam: register the size of PCM period to AMDTP domainTakashi Sakamoto2019-10-173-3/+15
| | | | | | | | | | | This commit is a preparation to share the size of PCM period between PCM substreams on AMDTP streams in the same domain. At this time, the size of PCM period in PCM substream which starts AMDTP streams in the same domain is recorded. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-8-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-digi00x: register the size of PCM period to AMDTP domainTakashi Sakamoto2019-10-174-4/+16
| | | | | | | | | | | This commit is a preparation to share the size of PCM period between PCM substreams on AMDTP streams in the same domain. At this time, the size of PCM period in PCM substream which starts AMDTP streams in the same domain is recorded. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-7-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: dice: register the size of PCM period to AMDTP domainTakashi Sakamoto2019-10-174-4/+16
| | | | | | | | | | | This commit is a preparation to share the size of PCM period between PCM substreams on AMDTP streams in the same domain. At this time, the size of PCM period in PCM substream which starts AMDTP streams in the same domain is recorded. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-6-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: oxfw: register the size of PCM period to AMDTP domainTakashi Sakamoto2019-10-174-6/+19
| | | | | | | | | | | This commit is a preparation to share the size of PCM period between PCM substreams on AMDTP streams in the same domain. At this time, the size of PCM period in PCM substream which starts AMDTP streams in the same domain is recorded. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-5-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: fireworks: register the size of PCM period to AMDTP domainTakashi Sakamoto2019-10-174-4/+16
| | | | | | | | | | | This commit is a preparation to share the size of PCM period between PCM substreams on AMDTP streams in the same domain. At this time, the size of PCM period in PCM substream which starts AMDTP streams in the same domain is recorded. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-4-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: bebob: register the size of PCM period to AMDTP domainTakashi Sakamoto2019-10-174-4/+16
| | | | | | | | | | | This commit is a preparation to share the size of PCM period between PCM substreams on AMDTP streams in the same domain. At this time, the size of PCM period in PCM substream which starts AMDTP streams in the same domain is recorded. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-3-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* ALSA: firewire-lib: add a member into AMDTP domain for events per periodTakashi Sakamoto2019-10-172-0/+14
| | | | | | | | | | | | | | | | | | | | | In IEC 61883-6, it's called as 'event' what has presentation time represented by timestamp in CIP header. Although the ratio of the number of event against the number of data block is different depending on event data type represented by the specific field in CIP header, it's just one in the most cases supported by ALSA IEC 61883-1/6 engine. In 1394 OHCI specification, applications can schedule hardware IRQ by configuring descriptor with IRQ flag for packet against each isochronous cycle. For future commit, I use the hardware IRQ for isoc IT context to acknowledge the elapse of PCM period for both playback/capture directions on AMDTP streams in the same domain. This commit is a preparation for the above idea. This commit adds a member into AMDTP domain structure to record the number of PCM frames. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191007110532.30270-2-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* sound: Fix Kconfig indentationKrzysztof Kozlowski2019-10-0718-162/+162
| | | | | | | | | | | Adjust indentation from spaces to tab (+optional two spaces) as in coding style with command like: $ sed -e 's/^ /\t/' -i */Kconfig Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20191004144931.3851-1-krzk@kernel.org Signed-off-by: Takashi Iwai <tiwai@suse.de>
* Merge tag 'sound-fix-5.4-rc1' of ↵Linus Torvalds2019-09-2513-24/+67
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound Pull sound fixes from Takashi Iwai: "A few small remaining wrap-up for this merge window. Most of patches are device-specific (HD-audio and USB-audio quirks, FireWire, pcm316a, fsl, rsnd, Atmel, and TI fixes), while there is a simple fix (actually two commits) for ASoC core" * tag 'sound-fix-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: usb-audio: Add DSD support for EVGA NU Audio ALSA: hda - Add laptop imic fixup for ASUS M9V laptop ASoC: ti: fix SND_SOC_DM365_VOICE_CODEC dependencies ASoC: pcm3168a: The codec does not support S32_LE ASoC: core: use list_del_init and move it back to soc_cleanup_component ALSA: hda/realtek - PCI quirk for Medion E4254 ALSA: hda - Apply AMD controller workaround for Raven platform ASoC: rsnd: do error check after rsnd_channel_normalization() ASoC: atmel_ssc_dai: Remove wrong spinlock usage ASoC: core: delete component->card_list in soc_remove_component only ASoC: fsl_sai: Fix noise when using EDMA ALSA: usb-audio: Add Hiby device family to quirks for native DSD support ALSA: hda/realtek - Fix alienware headset mic ALSA: dice: fix wrong packet parameter for Alesis iO26
| * ALSA: usb-audio: Add DSD support for EVGA NU AudioJussi Laako2019-09-241-0/+1
| | | | | | | | | | | | | | | | | | | | EVGA NU Audio is actually a USB audio device on a PCIexpress card, with it's own USB controller. It supports both PCM and DSD. Signed-off-by: Jussi Laako <jussi@sonarnerd.net> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20190924071143.30911-1-jussi@sonarnerd.net Signed-off-by: Takashi Iwai <tiwai@suse.de>
| * Merge tag 'asoc-fix-v5.4-rc1' of ↵Takashi Iwai2019-09-238-21/+34
| |\ | | | | | | | | | | | | | | | | | | | | | | | | https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus ASoC: Fixes for v5.4 A small smattering of ASoC fixes for v5.4 - nothing too exciting here, all small standalone things.
| | * ASoC: ti: fix SND_SOC_DM365_VOICE_CODEC dependenciesArnd Bergmann2019-09-201-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SND_SOC_DM365_VOICE_CODEC is a 'bool' option in a choice statement, meaning it cannot be set to =m, but it selects two other drivers that we may want to be loadable modules after all: WARNING: unmet direct dependencies detected for SND_SOC_CQ0093VC Depends on [m]: SOUND [=m] && !UML && SND [=m] && SND_SOC [=m] Selected by [y]: - SND_SOC_DM365_VOICE_CODEC [=y] && <choice> Selected by [m]: - SND_SOC_ALL_CODECS [=m] && SOUND [=m] && !UML && SND [=m] && SND_SOC [=m] && COMPILE_TEST [=y] Add an intermediate symbol that sets SND_SOC_CQ0093VC and MFD_DAVINCI_VOICECODEC to =m if SND_SOC=m. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20190920075046.3210393-1-arnd@arndb.de Signed-off-by: Mark Brown <broonie@kernel.org>
| | * ASoC: pcm3168a: The codec does not support S32_LEPeter Ujfalusi2019-09-201-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 24 bits is supported in all modes and 16 bit only when the codec is slave and the DAI is set to RIGHT_J. Remove the unsupported sample format. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20190919071652.31724-1-peter.ujfalusi@ti.com Signed-off-by: Mark Brown <broonie@kernel.org>
| | * ASoC: core: use list_del_init and move it back to soc_cleanup_componentBard liao2019-09-201-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit a0a4bf57a977 ("ASoC: core: delete component->card_list in soc_remove_component only") was trying to fix a kernel oops when list_del was called twice without re-init the list. Use list_del_init() can solve it, too. Besides, it will be more readable if we cleanup all component related resource at soc_cleanup_component(). Suggested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Bard liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20190918133131.15045-1-yung-chuan.liao@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
| | * ASoC: rsnd: do error check after rsnd_channel_normalization()Kuninori Morimoto2019-09-181-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | SSI need to use rsnd_channel_normalization() for TDM-split mode, thus, channel check need to do after that. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Link: https://lore.kernel.org/r/874l1aw39d.wl-kuninori.morimoto.gx@renesas.com Signed-off-by: Mark Brown <broonie@kernel.org>
| | * ASoC: atmel_ssc_dai: Remove wrong spinlock usageGregory CLEMENT2019-09-182-11/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A potential bug was reported in the email "[BUG] atmel_ssc_dai: a possible sleep-in-atomic bug in atmel_ssc_shutdown"[1] Indeed in the function atmel_ssc_shutdown() free_irq() was called in a critical section protected by spinlock. However this spinlock is only used in atmel_ssc_shutdown() and atmel_ssc_startup() functions. After further analysis, it occurred that the call to these function are already protected by mutex used on the calling functions. Then we can remove the spinlock which will fix this bug as a side effect. Thanks to this patch the following message disappears: "BUG: sleeping function called from invalid context at kernel/locking/mutex.c:909" [1]: https://www.spinics.net/lists/alsa-devel/msg71286.html Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com> Link: https://lore.kernel.org/r/20190918100344.23629-1-gregory.clement@bootlin.com Signed-off-by: Mark Brown <broonie@kernel.org>
| | * ASoC: core: delete component->card_list in soc_remove_component onlyBard Liao2019-09-171-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We add component->card_list in the end of soc_probe_component(). In other words, component->card_list will not be added if there is an error in the soc_probe_component() function. So we can't delete component->card_list in the error handling of soc_probe_component(). Fixes: 22d1423187e5 ("ASoC: soc-core: add soc_cleanup_component()") Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20190916210353.6318-1-yung-chuan.liao@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
| | * ASoC: fsl_sai: Fix noise when using EDMAMihai Serban2019-09-172-0/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | EDMA requires the period size to be multiple of maxburst. Otherwise the remaining bytes are not transferred and thus noise is produced. We can handle this issue by adding a constraint on SNDRV_PCM_HW_PARAM_PERIOD_SIZE to be multiple of tx/rx maxburst value. Signed-off-by: Mihai Serban <mihai.serban@nxp.com> Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> Acked-by: Nicolin Chen <nicoleotsuka@gmail.com> Link: https://lore.kernel.org/r/20190913192807.8423-2-daniel.baluta@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org>
| * | ALSA: hda - Add laptop imic fixup for ASUS M9V laptopShih-Yuan Lee (FourDollars)2019-09-201-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The same fixup to enable laptop imic is needed for ASUS M9V with AD1986A codec like another HP machine. Signed-off-by: Shih-Yuan Lee (FourDollars) <fourdollars@debian.org> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20190920134052.GA8035@localhost Signed-off-by: Takashi Iwai <tiwai@suse.de>
| * | ALSA: hda/realtek - PCI quirk for Medion E4254Jan-Marek Glogowski2019-09-201-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The laptop has a combined jack to attach headsets on the right. The BIOS encodes them as two different colored jacks at the front, but otherwise it seems to be configured ok. But any adaption of the pins config on its own doesn't fix the jack detection to work in Linux. Still Windows works correct. This is somehow fixed by chaining ALC256_FIXUP_ASUS_HEADSET_MODE, which seems to register the microphone jack as a headset part and also results in fixing jack sensing, visible in dmesg as: -snd_hda_codec_realtek hdaudioC0D0: Mic=0x19 +snd_hda_codec_realtek hdaudioC0D0: Headset Mic=0x19 [ Actually the essential change is the location of the jack; the driver created "Front Mic Jack" without the matching volume / mute control element due to its jack location, which confused PA. -- tiwai ] Signed-off-by: Jan-Marek Glogowski <glogow@fbihome.de> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/8f4f9b20-0aeb-f8f1-c02f-fd53c09679f1@fbihome.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
| * | ALSA: hda - Apply AMD controller workaround for Raven platformTakashi Iwai2019-09-201-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It's reported that the garbled sound on HP Envy x360 13z-ag000 (Ryzen Laptop) is fixed by the same workaround applied to other AMD chips. Update the driver_data entry for Raven (1022:15e3) to use the newly introduced preset, AZX_DCAPS_PRESET_AMD_SB. Since it already contains AZX_DCAPS_PM_RUNTIME, we can drop that bit, too. Reported-and-tested-by: Dennis Padiernos <depadiernos@gmail.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20190920073040.31764-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
| * | ALSA: usb-audio: Add Hiby device family to quirks for native DSD supportIlya Pshonkin2019-09-171-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds quirk VID ID for Hiby portable players family with native DSD playback support. Signed-off-by: Ilya Pshonkin <sudokamikaze@protonmail.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20190917074937.157802-1-ilya.pshonkin@netforce.ua Signed-off-by: Takashi Iwai <tiwai@suse.de>
| * | ALSA: hda/realtek - Fix alienware headset micJames McDonnell2019-09-161-0/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | Headset microphone quirk for alienware 15r3. Without this using a headset with mic attached will not work. Signed-off-by: James McDonnell <james_mcdonnell@hotmail.com> Link: https://lore.kernel.org/r/QB1PR01MB2337D0367C2E3ADB0010134F808C0@QB1PR01MB2337.CANPRD01.PROD.OUTLOOK.COM Signed-off-by: Takashi Iwai <tiwai@suse.de>
| * | ALSA: dice: fix wrong packet parameter for Alesis iO26Takashi Sakamoto2019-09-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | At higher sampling rate (e.g. 192.0 kHz), Alesis iO26 transfers 4 data channels per data block in CIP. Both iO14 and iO26 have the same contents in their configuration ROM. For this reason, ALSA Dice driver attempts to distinguish them according to the value of TX0_AUDIO register at probe callback. Although the way is valid at lower and middle sampling rate, it's lastly invalid at higher sampling rate because because the two models returns the same value for read transaction to the register. In the most cases, users just plug-in the device and ALSA dice driver detects it. In the case, the device runs at lower sampling rate and the driver detects expectedly. For this reason, this commit leaves the way to detect as is. Fixes: 28b208f600a3 ("ALSA: dice: add parameters of stream formats for models produced by Alesis") Cc: <stable@vger.kernel.org> # v4.18+ Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20190916101851.30409-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
* | | Merge tag 'mips_5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linuxLinus Torvalds2019-09-223-134/+2
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull MIPS updates from Paul Burton: "Main MIPS changes: - boot_mem_map is removed, providing a nice cleanup made possible by the recent removal of bootmem. - Some fixes to atomics, in general providing compiler barriers for smp_mb__{before,after}_atomic plus fixes specific to Loongson CPUs or MIPS32 systems using cmpxchg64(). - Conversion to the new generic VDSO infrastructure courtesy of Vincenzo Frascino. - Removal of undefined behavior in set_io_port_base(), fixing the behavior of some MIPS kernel configurations when built with recent clang versions. - Initial MIPS32 huge page support, functional on at least Ingenic SoCs. - pte_special() is now supported for some configurations, allowing among other things generic fast GUP to be used. - Miscellaneous fixes & cleanups. And platform specific changes: - Major improvements to Ingenic SoC support from Paul Cercueil, mostly enabled by the inclusion of the new TCU (timer-counter unit) drivers he's spent a very patient year or so working on. Plus some fixes for X1000 SoCs from Zhou Yanjie. - Netgear R6200 v1 systems are now supported by the bcm47xx platform. - DT updates for BMIPS, Lantiq & Microsemi Ocelot systems" * tag 'mips_5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (89 commits) MIPS: Detect bad _PFN_SHIFT values MIPS: Disable pte_special() for MIPS32 with RiXi MIPS: ralink: deactivate PCI support for SOC_MT7621 mips: compat: vdso: Use legacy syscalls as fallback MIPS: Drop Loongson _CACHE_* definitions MIPS: tlbex: Remove cpu_has_local_ebase MIPS: tlbex: Simplify r3k check MIPS: Select R3k-style TLB in Kconfig MIPS: PCI: refactor ioc3 special handling mips: remove ioremap_cachable mips/atomic: Fix smp_mb__{before,after}_atomic() mips/atomic: Fix loongson_llsc_mb() wreckage mips/atomic: Fix cmpxchg64 barriers MIPS: Octeon: remove duplicated include from dma-octeon.c firmware: bcm47xx_nvram: Allow COMPILE_TEST firmware: bcm47xx_nvram: Correct size_t printf format MIPS: Treat Loongson Extensions as ASEs MIPS: Remove dev_err() usage after platform_get_irq() MIPS: dts: mscc: describe the PTP ready interrupt MIPS: dts: mscc: describe the PTP register range ...
| * | | ASoC: jz4740: Drop lb60 board codePaul Cercueil2019-07-303-134/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The board now uses the simple-audio-card driver. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Artur Rojek <contact@artur-rojek.eu> Acked-by: Mark Brown <broonie@kernel.org> Signed-off-by: Paul Burton <paul.burton@mips.com>
* | | | Merge tag 'tag-chrome-platform-for-v5.4' of ↵Linus Torvalds2019-09-193-5/+5
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux Pull chrome platform updates from Benson Leung: "CrOS EC / MFD Migration: - Move cros_ec core driver from mfd into chrome platform. Wilco EC: - Add batt_ppid_info command to Wilco telemetry driver. CrOS EC: - cros_ec_rpmsg : Add support to inform EC of suspend/resume status - cros_ec_rpmsg : Fix race condition on probe failed - cros_ec_chardev : Add a poll handler to receive MKBP events Misc: - bugfixes in cros_usbpd_logger and cros_ec_ishtp" * tag 'tag-chrome-platform-for-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux: platform/chrome: cros_usbpd_logger: null check create_singlethread_workqueue platform/chrome: cros_ec_chardev: Add a poll handler to receive MKBP events platform/chrome: cros_ec_rpmsg: Fix race with host command when probe failed platform/chrome: chromeos_tbmc: Report wake events mfd: cros_ec: Use mfd_add_hotplug_devices() helper mfd: cros_ec: Add convenience struct to define autodetectable CrOS EC subdevices mfd: cros_ec: Add convenience struct to define dedicated CrOS EC MCUs mfd: cros_ec: Use kzalloc and cros_ec_cmd_xfer_status helper mfd / platform: cros_ec: Reorganize platform and mfd includes mfd / platform: cros_ec: Rename config to a better name mfd: cros_ec: Switch to use the new cros-ec-chardev driver mfd / platform: cros_ec: Miscellaneous character device to talk with the EC mfd / platform: cros_ec: Move cros-ec core driver out from MFD mfd / platform: cros_ec: Handle chained ECs as platform devices platform/chrome: cros_ec_rpmsg: Add host command AP sleep state support platform/chrome: chromeos_laptop: drop checks of NULL-safe functions platform/chrome: wilco_ec: Add batt_ppid_info command to telemetry driver
| * | | | mfd / platform: cros_ec: Reorganize platform and mfd includesEnric Balletbo i Serra2019-09-021-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is a bit of mess between cros-ec mfd includes and platform includes. For example, we have a linux/mfd/cros_ec.h include that exports the interface implemented in platform/chrome/cros_ec_proto.c. Or we have a linux/mfd/cros_ec_commands.h file that is non related to the multifunction device (in the sense that is not exporting any function of the mfd device). This causes crossed includes between mfd and platform/chrome subsystems and makes the code difficult to read, apart from creating 'curious' situations where a platform/chrome driver includes a linux/mfd/cros_ec.h file just to get the exported functions that are implemented in another platform/chrome driver. In order to have a better separation on what the cros-ec multifunction driver does and what the cros-ec core provides move and rework the affected includes doing: - Move cros_ec_commands.h to include/linux/platform_data/cros_ec_commands.h - Get rid of the parts that are implemented in the platform/chrome/cros_ec_proto.c driver from include/linux/mfd/cros_ec.h to a new file include/linux/platform_data/cros_ec_proto.h - Update all the drivers with the new includes, so - Drivers that only need to know about the protocol include - linux/platform_data/cros_ec_proto.h - linux/platform_data/cros_ec_commands.h - Drivers that need to know about the cros-ec mfd device also include - linux/mfd/cros_ec.h Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by: Gwendal Grignou <gwendal@chromium.org> Tested-by: Gwendal Grignou <gwendal@chromium.org> Series changes: 3 - Fix dereferencing pointer to incomplete type 'struct cros_ec_dev' (lkp) Signed-off-by: Lee Jones <lee.jones@linaro.org>