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author | Tony Lindgren <tony@atomide.com> | 2014-03-25 18:48:47 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-16 21:19:13 (GMT) |
commit | d758c9c1b36b4d9a141c2146c70398d756167ed1 (patch) | |
tree | 5b300e37228195c31af4e3056185908efab52aa7 /Documentation/serial/specialix.txt | |
parent | bf903c0c6ddfedec19ba92626ca30e98bfafbe08 (diff) | |
download | linux-d758c9c1b36b4d9a141c2146c70398d756167ed1.tar.xz |
serial: omap: Fix missing pm_runtime_resume handling by simplifying code
The lack of pm_runtime_resume handling for the device state leads into
device wake-up interrupts not working after a while for runtime PM.
Also, serial-omap is confused about the use of device_may_wakeup.
The checks for device_may_wakeup should only be done for suspend and
resume, not for pm_runtime_suspend and pm_runtime_resume. The wake-up
events for PM runtime should always be enabled.
The lack of pm_runtime_resume handling leads into device wake-up
interrupts not working after a while for runtime PM.
Rather than try to patch over the issue of adding complex tests to
the pm_runtime_resume, let's fix the issues properly:
1. Make serial_omap_enable_wakeup deal with all internal PM state
handling so we don't need to test for up->wakeups_enabled elsewhere.
Later on once omap3 boots in device tree only mode we can also
remove the up->wakeups_enabled flag and rely on the wake-up
interrupt enable/disable state alone.
2. Do the device_may_wakeup checks in suspend and resume only,
for runtime PM the wake-up events need to be always enabled.
3. Finally just call serial_omap_enable_wakeup and make sure we
call it also in pm_runtime_resume.
4. Note that we also have to use disable_irq_nosync as serial_omap_irq
calls pm_runtime_get_sync.
Fixes: 2a0b965cfb6e (serial: omap: Add support for optional wake-up)
Cc: stable@vger.kernel.org # v3.13+
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/serial/specialix.txt')
0 files changed, 0 insertions, 0 deletions