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

Parshuram Raju Thombare
2021-03-04T10:10:39Z

Ping !

>-----Original Message-----
>From: Parshuram Thombare <pthombar@cadence.com>
>Sent: Monday, November 30, 2020 11:46 AM
>To: alexandre.belloni@bootlin.com; slongerbeam@gmail.com;
>vitor.soares@synopsys.com
>Cc: linux-i3c@lists.infradead.org; linux-kernel@vger.kernel.org; Milind Parab
><mparab@cadence.com>; praneeth@ti.com; Parshuram Raju Thombare
><pthombar@cadence.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