linux-toradex.git/include/linux/firewire.h, branch v7.0-rc5

firewire: core: add fw_iso_context_create() variant with header storage size

2026-01-18T08:18:48+00:00

This commit adds a new variant of fw_iso_context_create() that allows
specifying the size of the isochronous context header storage at
allocation time.

Link: https://lore.kernel.org/r/20260117142823.440811-9-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: provide isoc header buffer size outside card driver

2026-01-18T08:18:48+00:00

For single-channel isochronous contexts, the header storage size is
hard-coded to PAGE_SIZE. which is inconvenient for protocol
implementations requiring more space.

This commit refactors the code to obtain the header storage size outside
the 1394 OHCI driver.

Link: https://lore.kernel.org/r/20260117142823.440811-8-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: add flags member for isochronous context structure

2026-01-18T08:18:48+00:00

This is minor code refactoring to add a flag member to the isochronous
context structure. At present, it is used only for the option to drop
packets when the context header overflows.

Link: https://lore.kernel.org/r/20260117142823.440811-6-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: add function variants for isochronous context creation

2026-01-18T08:18:48+00:00

The fw_iso_callback union was added by a commit ebe4560ed5c ("firewire:
Remove function callback casts") to remove function pointer cast.

That change affected the cdev layer of the core code, but it is more
convenient for fw_iso_context_create() to accept the union directly.

This commit renames and changes the existing function to take the union
argument, and add static inline wrapper functions as variants.

Link: https://lore.kernel.org/r/20260117142823.440811-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: stop using page private to store DMA mapping address

2026-01-12T02:49:37+00:00

There is a long discussion about the use of private field in page
structure between Linux kernel developers.

This commit stop using page private to store DMA mapping address for
isochronous context, to prepare for mm future change.

Link: https://lore.kernel.org/r/20260110013911.19160-6-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: move private function declaration from public header to internal header

2026-01-12T02:49:37+00:00

The fw_iso_buffer_lookup function is used by core module only, thus no
need to describe its prototype in kernel internal header.

Link: https://lore.kernel.org/r/20260110013911.19160-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: handle device quirk of TASCAM FW-1884/FW-1804/FW-1082

2025-10-18T03:58:56+00:00

TASCAM FW-1884/FW-1804/FW-1082 is too lazy to repspond to asynchronous
request at S400. The asynchronous transaction often results in timeout.
This is a problematic quirk.

This commit adds support for the quirk. When identifying the new quirk
flag, then the transaction speed is configured at S200.

Link: https://lore.kernel.org/r/20251018035532.287124-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: handle device quirk of MOTU Audio Express

2025-10-13T14:07:25+00:00

A commit 3a93d082bacf ("ALSA: firewire-motu: add support for MOTU Audio
Express") describes a quirk of MOTU Audio Express. The device returns
acknowledge packet with 0x10 as the pending state of any types of
asynchronous request transaction. It is completely out of specification.

This commit implements handling for that device-specific quirk. The quirk
is detected after reading the root directory of configuration ROM. When
processing the acknowledge code in 1394 OHCI AT context event handler,
firewire-ohci module seeks the device instance of destination node by
traversing device hierarchy. If the device has the quirk, the acknowledge
code is replaced with the standard code.

The 1394 OHCI AT context events occur for outgoing asynchronous request
packets. The device traversal is safe since no new request initiators
exist after the fw_card_instance has been invalidated.

Link: https://lore.kernel.org/r/20251013140311.97159-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: detect device quirk when reading configuration ROM

2025-10-13T14:07:24+00:00

Every time the bus manager runs, the cached configuration ROM content of
the IRM device is investigated to detect device-specific quirks. This
detection can be performed in advance when reading the configuration ROM.

This commit adds device quirk flags to the fw_device structure, and
initializes them after reading the bus information block of the
configuration ROM. The quirk flags are immutable once the configuration
ROM has been read. Although they are likely accessed concurrently only by
the bus manager, this commit ensures safe access by preventing torn writes
and reads using the WRITE_ONCE()/READ_ONCE() macros.

Link: https://lore.kernel.org/r/20251013140311.97159-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto

firewire: core: use spin lock specific to timer for split transaction

2025-09-15T23:52:19+00:00

At present the parameters to compute timeout time for split transaction is
protected by card-wide spin lock, while it is not necessarily convenient
in a point to narrower critical section.

This commit adds and uses another spin lock specific for the purpose.

Link: https://lore.kernel.org/r/20250915234747.915922-6-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto