[PATCH v2 0/6] ARM: at91: fix irq_pm_install_action WARNING

Boris Brezillon
2015-03-02T09:18:12Z

My apologies to those of you who already received this series, but I
didn't increment the patch version and forgot some subsystem maintainers
and MLs.

Commit cab303be91dc47942bc25de33dc1140123540800 [1] introduced a WARN_ON
test which triggers a WARNING backtrace on at91 platforms.
While this WARN_ON is absolutely necessary to warn users that they should
not mix request with and without IRQF_NO_SUSPEND flags on shared IRQs,
there is no easy way to solve this issue on at91 platforms.

The main reason is that the init timer is often using a shared irq line
and thus request this irq with IRQF_NO_SUSPEND flag set, while other
peripherals request the same irq line without this flag.

This problem has recently been addressed by this patch [2] which adds
a new IRQF_COND_SUSPEND flag, that authorize mixing IRQF_NO_SUSPEND and
!IRQF_NO_SUSPEND as long as irq handlers setting IRQF_COND_SUSPEND
can safely be called in suspended state.

Doing this also implies taking care of system wakeup in devices handlers
if they tag the IRQ line as a wakeup source.
The first patch of this series exports the pm_system_wakeup symbol so
that drivers can call pm_system_wakeup from their interrupt handler.

This series then patches all at91 drivers that can have devices sharing
their IRQ line with a timer.

This series depends on [2].

Best Regards,

Boris

[1]https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/kernel/irq/pm.c?id=cab303be91dc47942bc25de33dc1140123540800
[2]https://lkml.org/lkml/2015/2/26/675

Changes since v1:
- replaced the IRQF_SUSPEND_NOACTION flag by IRQF_COND_SUSPEND
- properly addressed wakeup handling in drivers

Boris Brezillon (6):
PM / wakeup: export pm_system_wakeup symbol
rtc: at91sam9: rework wakeup and interrupt handling
rtc: at91rm9200: rework wakeup and interrupt handling
clk: at91: implement suspend/resume for the PMC irqchip
watchdog: at91sam9: request the irq with IRQF_NO_SUSPEND
tty: serial: atmel: rework interrupt and wakeup handling

drivers/base/power/wakeup.c | 1 +
drivers/clk/at91/pmc.c | 20 ++++++++++-
drivers/clk/at91/pmc.h | 1 +
drivers/rtc/rtc-at91rm9200.c | 62 +++++++++++++++++++++++++--------
drivers/rtc/rtc-at91sam9.c | 73 ++++++++++++++++++++++++++++++++-------
drivers/tty/serial/atmel_serial.c | 49 +++++++++++++++++++++++---
drivers/watchdog/at91sam9_wdt.c | 3 +-
7 files changed, 177 insertions(+), 32 deletions(-)

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1.9.1