[PATCH 00/10] ARM: mvebu: Hardware coherency support for Armada 375 and 38x

[Thomas Petazzoni]

Jason, Gregory, Andrew, Sebastian,

Any news about this patch set? It is not aimed at 3.15 as was discussed
already with Jason, but since I'd still like to have some early
comments about this patch series for 3.16, since we would also like to
land the Armada 375/38x SMP support in 3.16, which will sit on top of
this series.

So far, Jason made one comment about runtime detecting the need for the
Armada 375 coherency workaround, to which I already replied. No other
comments have been made, unless I missed them, of course.

Thanks a lot!

Thomas

On Thu,  6 Mar 2014 17:46:25 +0100, Thomas Petazzoni wrote:
> Jason, Gregory, Andrew, Sebastian,
> 
> This set of patches add hardware coherency support for the new Armada
> 375 and Armada 38x SoCs. The patch set can be divided in three
> sections:
> 
>  * Patches 1, 2, 3 and 4 prepare the introduction of the support for
>    new SoC in the existing coherency code.
> 
>    The main change is that the mvebu-mbus driver no longer pokes into
>    the Device Tree to find whether hardware I/O coherency is available
>    or not: this information is passed as argument to the mvebu-mbus
>    initialization function. This avoids changing the mvebu-mbus driver
>    to add the compatible strings of all possible coherency fabrics,
>    and also avoids encoding specific conditions in the mvebu-mbus
>    driver: on Armada 375 and 38x, the hardware I/O coherency can only
>    be enabled in SMP mode.
> 
>    These preparation patches had already been sent in the past
>    (http://permalink.gmane.org/gmane.linux.ports.arm.kernel/290780). This
>    round has taken into account the comments I had received on this
>    early version.
> 
>  * Patches 5, 6, 7 and 8 add the coherency support itself. Patch 4
>    enables the SCU, patch 5 adds I/O coherency support for 375, patch
>    6 adds a major workaround to make coherency support actually work
>    on early 375 SOCs and patch 7 adds I/O coherency support for 38x.
> 
>  * Patches 9 and 10 add the necessary Device Tree informations to
>    enable the coherency.
> 
> Best regards,
> 
> Thomas
> 
> Thomas Petazzoni (10):
>   ARM: mvebu: prepare coherency code to support more SOCs
>   ARM: mvebu: add a coherency_available() call
>   bus: mvebu: pass the coherency availability information at init time
>   ARM: mvebu: ARM: mvebu: use of_find_matching_node_and_match() in
>     coherency.c
>   ARM: mvebu: enable the ARM SCU on Armada 375 and Armada 38x
>   ARM: mvebu: add Armada 375 support to the coherency code
>   ARM: mvebu: implement Armada 375 coherency workaround
>   ARM: mvebu: add Armada 38x support to the coherency code
>   ARM: mvebu: enable the coherency fabric on Armada 375
>   ARM: mvebu: enable the coherency fabric on Armada 38x
> 
>  .../devicetree/bindings/arm/coherency-fabric.txt   |  32 ++-
>  arch/arm/boot/dts/armada-375.dtsi                  |  10 +
>  arch/arm/boot/dts/armada-38x.dtsi                  |  10 +
>  arch/arm/mach-kirkwood/board-dt.c                  |   2 +-
>  arch/arm/mach-mvebu/Kconfig                        |   2 +
>  arch/arm/mach-mvebu/board-v7.c                     |  21 +-
>  arch/arm/mach-mvebu/coherency.c                    | 251 +++++++++++++++++++--
>  arch/arm/mach-mvebu/coherency.h                    |   1 +
>  drivers/bus/mvebu-mbus.c                           |  11 +-
>  include/linux/mbus.h                               |   2 +-
>  10 files changed, 305 insertions(+), 37 deletions(-)
> 



-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com