linux-stable.git/arch/arm, branch v4.0.7

ARM: EXYNOS: Fix failed second suspend on Exynos4

2015-06-29T19:29:08+00:00

commit 6f024978e74bda616b27183adee029b65eb27032 upstream.

On Exynos4412 boards (Trats2, Odroid U3) after enabling L2 cache in
56b60b8bce4a ("ARM: 8265/1: dts: exynos4: Add nodes for L2 cache
controller") the second suspend to RAM failed. First suspend worked fine
but the next one hang just after powering down of secondary CPUs (system
consumed energy as it would be running but was not responsive).

The issue was caused by enabling delayed reset assertion for CPU0 just
after issuing power down of cores. This was introduced for Exynos4 in
13cfa6c4f7fa ("ARM: EXYNOS: Fix CPU idle clock down after CPU off").

The whole behavior is not well documented but after checking with vendor
code this should be done like this (on Exynos4):
1. Enable delayed reset assertion when system is running (for all CPUs).
2. Disable delayed reset assertion before suspending the system.
   This can be done after powering off secondary CPUs.
3. Re-enable the delayed reset assertion when system is resumed.

Fixes: 13cfa6c4f7fa ("ARM: EXYNOS: Fix CPU idle clock down after CPU off")
Signed-off-by: Krzysztof Kozlowski 
Tested-by: Bartlomiej Zolnierkiewicz 
Tested-by: Chanwoo Choi 
Signed-off-by: Kukjin Kim 
Signed-off-by: Greg Kroah-Hartman

ARM: dts: am335x-boneblack: disable RTC-only sleep to avoid hardware damage

2015-06-23T00:03:31+00:00

commit 7a6cb0abe1aa63334f3ded6d2b6c8eca80e72302 upstream.

Avoid entering "RTC-only mode" at poweroff. It is unsupported by most
versions of BeagleBone, and risks hardware damage.

The damaging configuration is having system-power-controller
without ti,pmic-shutdown-controller.

Reported-by: Matthijs van Duin 
Tested-by: Matthijs van Duin 
Signed-off-by: Robert Nelson 
Cc: Tony Lindgren 
Cc: Felipe Balbi 
Cc: Johan Hovold 
[Matthijs van Duin: added explanatory comments]
Signed-off-by: Matthijs van Duin 
Fixes: http://bugs.elinux.org/issues/143
[tony@atomide.com: updated comments with the hardware breaking info]
Signed-off-by: Tony Lindgren 
Signed-off-by: Greg Kroah-Hartman

ARM: fix missing syscall trace exit

2015-06-06T15:21:05+00:00

commit 1b97937246d8b97c0760d16d8992c7937bdf5e6a upstream.

Josh Stone reports:

  I've discovered a case where both arm and arm64 will miss a ptrace
  syscall-exit that they should report.  If the syscall is entered
  without TIF_SYSCALL_TRACE set, then it goes on the fast path.  It's
  then possible to have TIF_SYSCALL_TRACE added in the middle of the
  syscall, but ret_fast_syscall doesn't check this flag again.

Fix this by always checking for a syscall trace in the fast exit path.

Reported-by: Josh Stone 
Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman

ARM: dts: set display clock correctly for exynos4412-trats2

2015-06-06T15:21:05+00:00

commit 242ddf04297f2c4768bd8eb7593ab911910c5f76 upstream.

This patch sets display clock correctly. If Display clock isn't set
correctly then you would find below messages and Display controller
doesn't work correctly.

 exynos-drm: No connectors reported connected with modes
 [drm] Cannot find any crtc or sizes - going 1024x768

Fixes: abc0b1447d49 ("drm: Perform basic sanity checks on probed modes")
Signed-off-by: Inki Dae 
Reviewed-by: Krzysztof Kozlowski 
Tested-by: Krzysztof Kozlowski 
Signed-off-by: Kukjin Kim 
Signed-off-by: Greg Kroah-Hartman

ARM: dts: fix imx27 dtb build rule

2015-06-06T15:21:05+00:00

commit e46b5a6470a5e2c8e1096f8f60887ac19949055b upstream.

The i.MX27 dtb build should be controlled by CONFIG_SOC_IMX27 rather
than CONFIG_SOC_IMX31.

Signed-off-by: Shawn Guo 
Fixes: cb612390e546 ("ARM: dts: Only build dtb if associated Arch and/or SoC is enabled")
Signed-off-by: Greg Kroah-Hartman

ARM: dts: imx27: only map 4 Kbyte for fec registers

2015-06-06T15:21:05+00:00

commit a29ef819f3f34f89a1b9b6a939b4c1cdfe1e85ce upstream.

According to the imx27 documentation, fec has a 4 Kbyte
memory space map. Moreover, the actual 16 Kbyte mapping
overlaps the SCC (Security Controller) memory register
space. So, we reduce the memory register space to 4 Kbyte.

Signed-off-by: Philippe Reynes 
Acked-by: Uwe Kleine-König 
Fixes: 9f0749e3eb88 ("ARM i.MX27: Add devicetree support")
Signed-off-by: Shawn Guo 
Signed-off-by: Greg Kroah-Hartman

ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider

2015-06-06T15:21:04+00:00

commit 0b7dc0ff95237a53287e52f1aab7408ebf1c4085 upstream.

ERR_PTR was dereferenced during sub domain parsing, if parent domain
could not be obtained (because of invalid phandle or deferred
registration of parent domain).

The Exynos power domain code checked whether
of_genpd_get_from_provider() returned NULL and in that case it skipped
that power domain node. However this function returns ERR_PTR or valid
pointer, not NULL.

Fixes: 0f7807518fe1 ("ARM: EXYNOS: add support for sub-power domains")
Signed-off-by: Krzysztof Kozlowski 
Signed-off-by: Kukjin Kim 
Signed-off-by: Greg Kroah-Hartman

ARM: 8356/1: mm: handle non-pmd-aligned end of RAM

2015-06-06T15:21:04+00:00

commit 965278dcb8ab0b1f666cc47937933c4be4aea48d upstream.

At boot time we round the memblock limit down to section size in an
attempt to ensure that we will have mapped this RAM with section
mappings prior to allocating from it. When mapping RAM we iterate over
PMD-sized chunks, creating these section mappings.

Section mappings are only created when the end of a chunk is aligned to
section size. Unfortunately, with classic page tables (where PMD_SIZE is
2 * SECTION_SIZE) this means that if a chunk is between 1M and 2M in
size the first 1M will not be mapped despite having been accounted for
in the memblock limit. This has been observed to result in page tables
being allocated from unmapped memory, causing boot-time hangs.

This patch modifies the memblock limit rounding to always round down to
PMD_SIZE instead of SECTION_SIZE. For classic MMU this means that we
will round the memblock limit down to a 2M boundary, matching the limits
on section mappings, and preventing allocations from unmapped memory.
For LPAE there should be no change as PMD_SIZE == SECTION_SIZE.

Signed-off-by: Mark Rutland 
Reported-by: Stefan Agner 
Tested-by: Stefan Agner 
Acked-by: Laura Abbott 
Tested-by: Hans de Goede 
Cc: Catalin Marinas 
Cc: Steve Capper 
Signed-off-by: Russell King 
Signed-off-by: Greg Kroah-Hartman

ARM: 8325/1: exynos: move resume code to .text section

2015-06-06T15:21:03+00:00

commit 12833bacf5d904c2dac0c3f52b2ebde5f2c5a2bc upstream.

This code calls cpu_resume() using a straight branch (b), so
now that we have moved cpu_resume() back to .text, this should
be moved there as well. Any direct references to symbols that will
remain in the .data section are replaced with explicit PC-relative
references.

Acked-by: Nicolas Pitre 
Signed-off-by: Ard Biesheuvel 
Signed-off-by: Russell King 
Signed-off-by: Kevin Hilman 
Signed-off-by: Greg Kroah-Hartman

ARM: 8307/1: psci: move psci firmware calls out of line

2015-05-17T16:55:10+00:00

commit c097877319ab61dd045b6497953b4e3df8f2bb44 upstream.

arm64 builds with GCC 5 have caused the __asmeq assertions in the PSCI
calling code to fire, so move the ARM PSCI calls out of line into their
own assembly file for consistency and to safeguard against the same
issue occuring with the 32-bit toolchain.

[will: brought into line with arm64 implementation]

Reported-by: Andy Whitcroft 
Signed-off-by: Mark Rutland 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King 
Signed-off-by: Kevin Hilman 
Signed-off-by: Greg Kroah-Hartman