linux-kernel - RE: [PATCH v10 0/7] I3C mastership handover support

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Message-ID: <DM5PR07MB3196C2BCD48597E8CAD2DD34C1979@DM5PR07MB3196.namprd07.prod.outlook.com>
Date:   Thu, 4 Mar 2021 10:06:32 +0000
From:   Parshuram Raju Thombare <pthombar@...ence.com>
To:     Parshuram Raju Thombare <pthombar@...ence.com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "slongerbeam@...il.com" <slongerbeam@...il.com>,
        "vitor.soares@...opsys.com" <vitor.soares@...opsys.com>
CC:     "linux-i3c@...ts.infradead.org" <linux-i3c@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Milind Parab <mparab@...ence.com>,
        "praneeth@...com" <praneeth@...com>
Subject: RE: [PATCH v10 0/7] I3C mastership handover support

Ping !

>-----Original Message-----
>From: Parshuram Thombare <pthombar@...ence.com>
>Sent: Monday, November 30, 2020 11:46 AM
>To: alexandre.belloni@...tlin.com; slongerbeam@...il.com;
>vitor.soares@...opsys.com
>Cc: linux-i3c@...ts.infradead.org; linux-kernel@...r.kernel.org; Milind Parab
><mparab@...ence.com>; praneeth@...com; Parshuram Raju Thombare
><pthombar@...ence.com>
>Subject: [PATCH v10 0/7] I3C mastership handover support
>
>Main changes between v9 and v10 are:
>- Fix build failure reported by kernel test robot
>
>Main changes between v8 and v9 are:
>- Fix NULL dereference issue in current_master_show when
>  cat'ing sysfs key current_master for secondary master
>  before primary master gets initialized.
>
>Main changes between v7 and v8 are:
>- Document format changed from table to DOT diagram
>- Appropriate names for few functions
>- Moved mastership request process entirely to the driver
>- Reuse of i3c_master_add_i3c_dev_locked in core defslvs
>  processing
>
>Main changes between v6 and v7 are:
>- Added separate functions for main and secondary
>  master initialization
>- Secondary master initialization don't wait for
>  DEFSLSVS.
>- Change to use I2C device information from DTS,
>  and corresponding changes in controller driver
>  and I3C core DEFSLVS processing to ignore I2C
>  devices received in DEFSLVS
>- Reverted bus_init split
>- Fixed formatting issues in document
>
>Main changes between v5 and v6 are:
>- Moved populate_bus() hook to master subsystem code.
>- For secondary master initialization i3c_master_register
>  spawan separate threads, as secondary master may have to
>  wait for DEFSLVS and bus mastership.
>- Populate bus info is based on DEFSLVS data and take care
>  of hot plugged / unplugged I3C devices.
>- Split bus_init into bus_init and master_set_info callbacks
>- Moved mastership aquire and handover to separate state
>  machines.
>- Added DEFSLVS processing code.
>- Moved back all locks in side the subsystem code.
>- Secondary mastership support to Cadence I3C master
>  controller driver
>- Sysfs key 'i3c_acquire_bus' to acauire bus.
>- NULL check for pool pointer in i3c_generic_ibi_free_pool.
>
>Main changes between v4 and v5 are:
>- Add populate_bus() hook
>- Split i3c_master_register into init and register pair
>- Split device information retrieval, let add partialy discovered devices
>- Make i3c_master_set_info private
>- Add separate function to register secondary master
>- Reworked secondary master register in CDNS driver
>- Export i3c_bus_set_mode
>
>Main changes between v3 and v4 are:
>- Reworked acquire bus ownership
>- Refactored the code
>
>Main changes between v2 and v3 are:
>- Added DEFSLVS devices are registered from master driver
>- Reworked I2C registering on secondary master side
>- Reworked Mastership event is enabled/disabled globally (for all devices)
>
>Main changes between initial version and v2 are:
>- Reworked devices registration on secondary master side
>- Reworked mastership event disabling/enabling
>- Reworked bus locking during mastership takeover process
>- Added DEFSLVS devices registration during initialization
>- Fixed style issues
>
>Parshuram Thombare (7):
>  i3c: master: master initialization flow document
>  i3c: master: use i3c_master_register only for main master
>  i3c: master: add i3c_secondary_master_register
>  i3c: master: add mastership handover support
>  i3c: master: add defslvs processing
>  i3c: master: sysfs key for acquire bus
>  i3c: master: mastership handover, defslvs processing in cdns
>    controller driver
>
> Documentation/driver-api/i3c/index.rst             |    1 +
> .../driver-api/i3c/master-initialization-flow.rst  |  187 ++++++++
> drivers/i3c/master.c                               |  497 ++++++++++++++++++--
> drivers/i3c/master/dw-i3c-master.c                 |    4 +-
> drivers/i3c/master/i3c-master-cdns.c               |  329 ++++++++++++-
> drivers/i3c/master/mipi-i3c-hci/core.c             |    4 +-
> include/linux/i3c/master.h                         |   23 +-
> 7 files changed, 970 insertions(+), 75 deletions(-)
> create mode 100644 Documentation/driver-api/i3c/master-initialization-flow.rst