[PATCH v5 0/4] Fix i2c bus hang on A0 version of the Armada XP SoCs

[Gregory CLEMENT]

On 08/01/2014 16:06, Gregory CLEMENT wrote:
> Hi,
> 
> Here come the 5th version of the series fixing the i2c bus hang on A0
> version of the Armada XP SoCs. It occurred on the early release of the
> OpenBlocks AX3-4 boards. Indeed the first variants of Armada XP SoCs
> (A0 stepping) have issues related to the i2c controller which prevent
> to use the offload mechanism and lead to a kernel hang during boot.
> 
> The main change are the use of marvell,mv78230-a0-i2c and that the
> function mvebu_get_soc_id() is now local to mach-mvebu.
> 
> The first patch add a mean to detect the SoCs version at run-time and
> the second one use this feature in the driver.
> 
> The 3 first patches should be applied on 3.13-rc and on stable kernel
> 3.12 as it fixes a regression introduce by the commit 930ab3d403ae
> "i2c: mv64xxx: Add I2C Transaction Generator support".
> 
> The first patch could be latter be extend to also be used with dove,
> kirkwood, orion5x and mv78x00 when there will be merged in mvebu and
> even expose the SoC ID and revision to userspace.
> 
> Jason, do you still agree to take the series once Wolfram have given
> his acked-by?

Jason,

if it can help you I have just pull my branch at:
https://github.com/MISL-EBU-System-SW/mainline-public/tree/i2c-mv64xxx-3.13-rc6-fixes-v6

git at github.com:MISL-EBU-System-SW/mainline-public.git

I also taken into account the two comments and added the acked-by from Wolfram and
Arnd on the appropriate commit.


Thanks,

Gregory

> 
> Thanks,
> 
> Gregory
> 
> Changelog:
> v4 -> v5:
> 
> - use the marvell,mv78230-a0-i2c compatible string instead of the
>   offload-broken property.
> 
> - move the mvebu-soc-id.h file into mach-mvebu
> 
> - no more export the mvebu_get_soc_id() function
> 
> - enable the quirk only on machines that we know may be affected, i.e.
> OpenBlocks AX3-4.
> 
> v3 -> v4:
> 
> - checked the offload-broken property instead of calling the
>   mvebu_get_soc_id() function in the mv64xxx_of_config() function.
> 
> - added the second patch to manage the quirk and update the device
>   node with the offload-broken if needed.
> 
> - removed the acked-by from Wolfram as the code have change in the 3rd
>   patch
> 
> In mvebu-soc-id.c:
>  - used EXPORT_SYMBOL_GPL instead of EXPORT_SYMBOL
> 
>  - used core_initcall instead of arch_initcall to be called earlier
>    enough.
> 
> v2 -> v3:
> 
> - fixed typo in the comments added in i2c-mv64xxx.c
> 
> - used pr_fmt instead of %s __func__ in all the pr_* functions
> 
> - added a check on the pointer returned by of_get_next_child()
> 
> - added a return immediately after the 1st check to be able to get rid
>   of indenting the entire function code inside the if { ... } block.
> 
> v1 -> v2:
> 
> - Changed the way to test the return of the function mvebu_get_soc_id
>   in order to make it clearer.
> 
> - Removed the superfluous parentheses
> 
> - Added Wolfram's acked-by on the 2nd patch
> 
> Gregory CLEMENT (4):
>   ARM: mvebu: Add support to get the ID and the revision of a SoC
>   ARM: mvebu: Add quirk for i2c for the OpenBlocks AX3-4 board
>   i2c: mv64xxx: Fix bus hang on A0 version of the Armada XP SoCs
>   i2c: mv64xxx: Document the newly introduced Armada XP A0 compatible
> 
>  .../devicetree/bindings/i2c/i2c-mv64xxx.txt        |   2 +-
>  arch/arm/mach-mvebu/Makefile                       |   2 +-
>  arch/arm/mach-mvebu/armada-370-xp.c                |  32 ++++++
>  arch/arm/mach-mvebu/mvebu-soc-id.c                 | 119 +++++++++++++++++++++
>  arch/arm/mach-mvebu/mvebu-soc-id.h                 |  32 ++++++
>  drivers/i2c/busses/i2c-mv64xxx.c                   |   8 ++
>  6 files changed, 193 insertions(+), 2 deletions(-)
>  create mode 100644 arch/arm/mach-mvebu/mvebu-soc-id.c
>  create mode 100644 arch/arm/mach-mvebu/mvebu-soc-id.h
> 


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com