linux-kernel - [PATCH v2 0/4] support USB offload feature

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Message-Id: <1646648256-105214-1-git-send-email-dh10.jung@samsung.com>
Date:   Mon,  7 Mar 2022 19:17:32 +0900
From:   Daehwan Jung <dh10.jung@...sung.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org (open list:USB XHCI DRIVER),
        linux-kernel@...r.kernel.org (open list),
        Howard Yen <howardyen@...gle.com>,
        Jack Pham <jackp@...eaurora.org>,
        Puma Hsu <pumahsu@...gle.com>,
        "J . Avila" <elavila@...gle.com>,
        Daehwan Jung <dh10.jung@...sung.com>, sc.suh@...sung.com,
        cpgs@...sung.com, cpgsproxy5@...sung.com
Subject: [PATCH v2 0/4] support USB offload feature

This patchset is for USB offload feature, which makes Co-processor to use
some memories of xhci. Especially it's useful for USB Audio scenario.
Audio stream would get shortcut because Co-processor directly write/read
data in xhci memories. It could get speed-up using faster memory like SRAM.
That's why this gives vendors flexibilty of memory management.
Several pathches have been merged in AOSP kernel(android12-5.10) and I put
together and split into 3 patches. Plus let me add user(xhci-exynos)
module to see how user could use it. 

To sum up, it's for providing xhci memories to Co-Processor.
It would cover DCBAA, Device Context, Transfer Ring, Event Ring, ERST.
It needs xhci hooks and to export some xhci symbols.

Changes in v2 :
- Fix commit message by adding Signed-off-by in each patch.
- Fix conflict on latest.

Daehwan Jung (4):
  usb: host: export symbols for xhci hooks usage
  usb: host: add xhci hooks for USB offload
  usb: host: add some to xhci overrides for USB offload
  usb: host: add xhci-exynos module

 drivers/usb/host/xhci-exynos.c | 2025 ++++++++++++++++++++++++++++++++
 drivers/usb/host/xhci-exynos.h |  150 +++
 drivers/usb/host/xhci-hub.c    |    7 +
 drivers/usb/host/xhci-mem.c    |  160 ++-
 drivers/usb/host/xhci-plat.c   |   43 +-
 drivers/usb/host/xhci-plat.h   |    8 +
 drivers/usb/host/xhci-ring.c   |   22 +-
 drivers/usb/host/xhci.c        |  104 +-
 drivers/usb/host/xhci.h        |   54 +
 9 files changed, 2545 insertions(+), 28 deletions(-)
 create mode 100644 drivers/usb/host/xhci-exynos.c
 create mode 100644 drivers/usb/host/xhci-exynos.h

-- 
2.31.1