linux-kernel - [PATCH v4 0/5] add xhci-exynos driver

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Message-Id: <1650964728-175347-1-git-send-email-dh10.jung@samsung.com>
Date:   Tue, 26 Apr 2022 18:18:43 +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,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Subject: [PATCH v4 0/5] add xhci-exynos driver

This patchset is for Samsung Exynos xhci host conroller. It uses xhci-plat
driver mainly and extends some functions by xhci hooks and overrides.

This driver supports USB offload 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. This feature
is done with xhci hooks and overrides.

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

Changes in v3 :
- Remove export symbols and xhci hooks which xhci-exynos don't need.
- Modify commit message to clarify why it needs to export symbols.
- Check compiling of xhci-exynos.

Changes in v4 :
- Modify commit message to clarify why it needs to export symbols.
- Add a function for override of hc driver in xhci-plat.
- Make xhci-exynos extending xhci-plat by xhci hooks and overrides.
  (vendor_init / vendor_cleanup hooks are useful from here v4)
- Change the term (USB offload -> xhci-exynos) on subject of patches.

Daehwan Jung (5):
  usb: host: export symbols for xhci-exynos to use xhci hooks
  usb: host: add xhci hooks for xhci-exynos
  usb: host: xhci-plat: support override of hc driver
  usb: host: add some to xhci overrides for xhci-exynos
  usb: host: add xhci-exynos driver

 drivers/usb/host/Kconfig       |   8 +
 drivers/usb/host/Makefile      |   1 +
 drivers/usb/host/xhci-exynos.c | 567 +++++++++++++++++++++++++++++++++
 drivers/usb/host/xhci-exynos.h |  50 +++
 drivers/usb/host/xhci-hub.c    |   7 +
 drivers/usb/host/xhci-mem.c    | 150 +++++++--
 drivers/usb/host/xhci-plat.c   |  50 ++-
 drivers/usb/host/xhci-plat.h   |   9 +
 drivers/usb/host/xhci-ring.c   |   1 +
 drivers/usb/host/xhci.c        |  90 +++++-
 drivers/usb/host/xhci.h        |  50 +++
 11 files changed, 958 insertions(+), 25 deletions(-)
 create mode 100644 drivers/usb/host/xhci-exynos.c
 create mode 100644 drivers/usb/host/xhci-exynos.h

-- 
2.31.1