This is a note to let you know that I've just added the patch titled
ARM: OMAP2+: hwmod: Rearm wake-up interrupts for DT when MUSB is idled
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-omap2-hwmod-rearm-wake-up-interrupts-for-dt-when-musb-is-idled.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cc824534d4fef0e46e4486d5c1e10d3c6b1ebadc Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@xxxxxxxxxxx>
Date: Mon, 25 Aug 2014 16:15:35 -0700
Subject: ARM: OMAP2+: hwmod: Rearm wake-up interrupts for DT when MUSB is idled
From: Tony Lindgren <tony@xxxxxxxxxxx>
commit cc824534d4fef0e46e4486d5c1e10d3c6b1ebadc upstream.
Looks like MUSB cable removal can cause wake-up interrupts to
stop working for device tree based booting at least for UART3
even as nothing is dynamically remuxed. This can be fixed by
calling reconfigure_io_chain() for device tree based booting
in hwmod code. Note that we already do that for legacy booting
if the legacy mux is configured.
My guess is that this is related to UART3 and MUSB ULPI
hsusb0_data0 and hsusb0_data1 support for Carkit mode that
somehow affect the configured IO chain for UART3 and require
rearming the wake-up interrupts.
In general, for device tree based booting, pinctrl-single
calls the rearm hook that in turn calls reconfigure_io_chain
so calling reconfigure_io_chain should not be needed from the
hwmod code for other events.
So let's limit the hwmod rearming of iochain only to
HWMOD_FORCE_MSTANDBY where MUSB is currently the only user
of it. If we see other devices needing similar changes we can
add more checks for it.
Cc: Paul Walmsley <paul@xxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-omap2/omap_hwmod.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -2177,6 +2177,8 @@ static int _enable(struct omap_hwmod *oh
oh->mux->pads_dynamic))) {
omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
_reconfigure_io_chain();
+ } else if (oh->flags & HWMOD_FORCE_MSTANDBY) {
+ _reconfigure_io_chain();
}
_add_initiator_dep(oh, mpu_oh);
@@ -2283,6 +2285,8 @@ static int _idle(struct omap_hwmod *oh)
if (oh->mux && oh->mux->pads_dynamic) {
omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
_reconfigure_io_chain();
+ } else if (oh->flags & HWMOD_FORCE_MSTANDBY) {
+ _reconfigure_io_chain();
}
oh->_state = _HWMOD_STATE_IDLE;
Patches currently in stable-queue which might be from tony@xxxxxxxxxxx are
queue-3.10/arm-omap3-fix-choice-of-omap3_restore_es-function-in-omap34xx-rev3.1.2-case.patch
queue-3.10/arm-omap2-hwmod-rearm-wake-up-interrupts-for-dt-when-musb-is-idled.patch
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