linux-kernel - [PATCH 0/9] firewire: core: add fw_iso_context() variant with configurable isoc header size

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Message-ID: <20260117142823.440811-1-o-takashi@sakamocchi.jp>
Date: Sat, 17 Jan 2026 23:28:13 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org,
	linux-sound@...r.kernel.org
Subject: [PATCH 0/9] firewire: core: add fw_iso_context() variant with configurable isoc header size

Hi,

Currently ALSA IEC 61883-1/6 packet streaming engine provides the maximum
PCM buffer size constraints to drivers for audio and music units in
IEEE 1394 bus, due to hard-coded size of isochronous context header for
1394 OHCI IR context.

The limitation is inconvenient a bit, and this patchset removes it by
allowing the drivers to configure the size of isochronous context
header.

To sound subsystem maintainer, I'd like to send the last patch to
mainline in my side.

Takashi Sakamoto (9):
  firewire: core: add function variants for isochronous context creation
  firewire: ohci: refactor isoc single-channel state using a union
  firewire: ohci: code refactoring to use union for isoc multiple
    channel state
  firewire: ohci: use cleanup helper for isoc context header allocation
  firewire: core: add flags member for isochronous context structure
  firewire: ohci: allocate isoc context header by kvmalloc()
  firewire: core: provide isoc header buffer size outside card driver
  firewire: core: add fw_iso_context_create() variant with header
    storage size
  ALSA: firewire: remove PCM buffer size constraint from isoc context
    header

 drivers/firewire/core-card.c  |   4 +-
 drivers/firewire/core-cdev.c  |  30 ++--------
 drivers/firewire/core-iso.c   |  16 ++---
 drivers/firewire/core.h       |  13 +++-
 drivers/firewire/ohci.c       | 110 +++++++++++++++++++---------------
 include/linux/firewire.h      |  33 ++++++++--
 sound/firewire/amdtp-stream.c |  31 +++-------
 7 files changed, 125 insertions(+), 112 deletions(-)


base-commit: a4cd9860fa085f0d04d2065f4c151fcde9fcdf4a
-- 
2.51.0