linux.git/arch/arm, branch v3.10

ARM: dt: Only print warning, not WARN() on bad cpu map in device tree

2013-06-30T00:00:40+00:00

Due to recent changes and expecations of proper cpu bindings, there are
now cases for many of the in-tree devicetrees where a WARN() will hit
on boot due to badly formatted /cpus nodes.

Downgrade this to a pr_warn() to be less alarmist, since it's not a
new problem.

Tested on Arndale, Cubox, Seaboard and Panda ES. Panda hits the WARN
without this, the others do not.

Acked-by: Russell King 
Signed-off-by: Olof Johansson 
Signed-off-by: Linus Torvalds

ARM: 7773/1: PJ4B: Add support for errata 4742

2013-06-24T13:28:46+00:00

This commit fixes the regression on Armada 370 (the kernal hang during
boot) introduced by the commit: "ARM: 7691/1: mm: kill unused
TLB_CAN_READ_FROM_L1_CACHE and use ALT_SMP instead".

When coming out of either a Wait for Interrupt (WFI) or a Wait for
Event (WFE) IDLE states, a specific timing sensitivity exists between
the retiring WFI/WFE instructions and the newly issued subsequent
instructions. This sensitivity can result in a CPU hang scenario.  The
workaround is to insert either a Data Synchronization Barrier (DSB) or
Data Memory Barrier (DMB) command immediately after the WFI/WFE
instruction.

This commit was based on the work of Lior Amsalem, but heavily
modified to apply the errata fix dynamically according to the
processor type thanks to the suggestions of Russell King and Nicolas
Pitre.

Signed-off-by: Gregory CLEMENT 
Reviewed-by: Will Deacon 
Acked-by: Nicolas Pitre 
Tested-by: Willy Tarreau 
Cc: 
Signed-off-by: Russell King

ARM: 7772/1: Fix missing flush_kernel_dcache_page() for noMMU

2013-06-24T13:28:44+00:00

Commit 1bc3974 (ARM: 7755/1: handle user space mapped pages in
flush_kernel_dcache_page) moved the implementation of
flush_kernel_dcache_page() into mm/flush.c but did not implement it
on noMMU ARM.

Signed-off-by: Simon Baatz 
Acked-by: Kevin Hilman 
Cc:  # 3.2+: 1bc3974: ARM: 7755/1
Signed-off-by: Russell King

ARM: 7763/1: kernel: fix __cpu_logical_map default initialization

2013-06-24T13:28:43+00:00

The __cpu_logical_map array is statically initialized to 0, which is a valid
MPIDR value. To prevent issues with the current implementation, this patch
defines an MPIDR_INVALID value, and statically initializes the
__cpu_logical_map[] array to it. Entries in the arm_dt_init_cpu_maps()
tmp_map array used to stash DT reg properties while parsing DT are initialized
with the MPIDR_INVALID value as well for consistency.

Signed-off-by: Lorenzo Pieralisi 
Acked-by: Nicolas Pitre 
Cc: Will Deacon 
Signed-off-by: Russell King

ARM: 7762/1: kernel: fix arm_dt_init_cpu_maps() to skip non-cpu nodes

2013-06-24T13:25:42+00:00

The introduction of the cpu-map topology node in the cpus node implies
that cpus node might have children that are not cpu nodes. The DT
parsing code needs updating otherwise it would check for cpu nodes
properties in nodes that are not required to contain them, resulting
in warnings that have no bearing on bindings defined in the dts source file.

Cc:  [3.8+]
Signed-off-by: Lorenzo Pieralisi 
Acked-by: Nicolas Pitre 
Signed-off-by: Russell King

ARM: 7760/1: cpu_fa526_do_idle: remove WFI

2013-06-24T13:25:41+00:00

As it was already suggested by Russell King and Arnd Bergmann:

https://lkml.org/lkml/2013/5/16/133

moxart and gemini seem to be the only platforms using CPU_FA526,
and instead of pointing arm_pm_idle to an empty function from
platform code, it makes sense to remove WFI code from the processor
specific idle function.

Applies to arm-soc/for-next (and 3.10-rc1).

Changes since v1:

1. remove WFI but make sure cpu_fa526_do_idle do not fall through
   to cpu_fa526_dcache_clean_area

Note: moxart boots and prints to UART without this patch, but input is broken.

Signed-off-by: Jonas Jensen 
Signed-off-by: Russell King

Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

2013-06-22T19:44:45+00:00

Pull ARM SoC fixes from Arnd Bergmann:
 "These are two fixes that came in this week, one for a regression we
  introduced in 3.10 in the GIC interrupt code, and the other one fixes
  a typo in newly introduced code"

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  irqchip: gic: call gic_cpu_init() as well in CPU_STARTING_FROZEN case
  ARM: dts: Correct the base address of pinctrl_3 on Exynos5250

Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm

2013-06-19T16:19:46+00:00

Pull ARM fixes from Russell King:
 "The larger changes this time are

   - "ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page"
     which fixes more data corruption problems with O_DIRECT

   - "ARM: 7759/1: decouple CPU offlining from reboot/shutdown" which
     gets us back to working shutdown/reboot on SMP platforms

   - "ARM: 7752/1: errata: LoUIS bit field in CLIDR register is incorrect"
     which fixes a shutdown regression found in v3.10 on Versatile
     Express platforms.

  The remainder are the quite small, maybe one or two line changes"

* 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
  ARM: 7759/1: decouple CPU offlining from reboot/shutdown
  ARM: 7756/1: zImage/virt: remove hyp-stub.S during distclean
  ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page
  ARM: 7754/1: Fix the CPU ID and the mask associated to the PJ4B
  ARM: 7753/1: map_init_section flushes incorrect pmd
  ARM: 7752/1: errata: LoUIS bit field in CLIDR register is incorrect

ARM: 7759/1: decouple CPU offlining from reboot/shutdown

2013-06-17T20:35:25+00:00

Add comments to machine_shutdown()/halt()/power_off()/restart() that
describe their purpose and/or requirements re: CPUs being active/not.

In machine_shutdown(), replace the call to smp_send_stop() with a call to
disable_nonboot_cpus(). This completely disables all but one CPU, thus
satisfying the requirement that only a single CPU be active for kexec.
Adjust Kconfig dependencies for this change.

In machine_halt()/power_off()/restart(), call smp_send_stop() directly,
rather than via machine_shutdown(); these functions don't need to
completely de-activate all CPUs using hotplug, but rather just quiesce
them.

Remove smp_kill_cpus(), and its call from smp_send_stop().
smp_kill_cpus() was indirectly calling smp_ops.cpu_kill() without calling
smp_ops.cpu_die() on the target CPUs first. At least some implementations
of smp_ops had issues with this; it caused cpu_kill() to hang on Tegra,
for example. Since smp_send_stop() is only used for shutdown, halt, and
power-off, there is no need to attempt any kind of CPU hotplug here.

Adjust Kconfig to reflect that machine_shutdown() (and hence kexec)
relies upon disable_nonboot_cpus(). However, this alone doesn't guarantee
that hotplug will work, or even that hotplug is implemented for a
particular piece of HW that a multi-platform zImage runs on. Hence, add
error-checking to machine_kexec() to determine whether it did work.

Suggested-by: Russell King 
Signed-off-by: Stephen Warren 
Acked-by: Will Deacon 
Tested-by:  Zhangfei Gao 
Signed-off-by: Russell King

ARM: dts: Correct the base address of pinctrl_3 on Exynos5250

2013-06-17T17:06:17+00:00

This patch corrects the base address of pinctrl_3 on Exynos5250
platform.

Signed-off-by: Padmavathi Venna 
Acked-by: Kukjin Kim 
Signed-off-by: Olof Johansson