From cd68970599d2f48a6176e4de5a3abc7c87db9a21 Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Mon, 25 Aug 2014 16:15:35 -0700 Subject: [PATCH] ARM: OMAP2+: hwmod: Rearm wake-up interrupts for DT when MUSB is idled 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 Signed-off-by: Tony Lindgren Signed-off-by: Greg Kroah-Hartman Signed-off-by: Jiri Slaby --- arch/arm/mach-omap2/omap_hwmod.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index 832adb1a6dd2d..3d29fb972cd09 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -2179,6 +2179,8 @@ 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); @@ -2285,6 +2287,8 @@ 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; -- 2.47.3