On Tue, 27 Jan 2015, Felipe Balbi wrote: > On Tue, Jan 27, 2015 at 11:15:32AM -0600, Felipe Balbi wrote: > > On Tue, Jan 27, 2015 at 05:12:05PM +0000, Paul Walmsley wrote: > > > On Tue, 27 Jan 2015, Felipe Balbi wrote: > > > > > > > On Mon, Jan 26, 2015 at 01:49:33PM -0600, Felipe Balbi wrote: > > > > > On Mon, Jan 26, 2015 at 10:56:40AM -0600, Felipe Balbi wrote: > > > > > > > > > > > hm... modulemode SWCTRL causes wait_target_ready to fail. Any hints ? > > > > > > > > > > gets stuck in transition state. PRCM_CM_WKUP_DBGSS_CLKCTRL is always > > > > > read as 0x 12510f00 which would translate into: > > > > > > > > > > - module disabled > > > > > - all opt clocks are on > > > > > - module is transitioning > > > > > - module in standby > > > > > - clkA as TPIU and STM trace clock > > > > > - all dividers set to 2 > > > > > > > > just fyi, checking with HW folks, this might be a new bug, unless > > > > debugss needs something special. > > > > > > If that happens on DEBUGSS disable, it's probably the same issue as on > > > AM33xx: > > > > > > http://www.spinics.net/lists/arm-kernel/msg320801.html > > > http://www.spinics.net/lists/arm-kernel/msg321930.html > > > http://www.spinics.net/lists/arm-kernel/msg329151.html > > > > > > Does adding HWMOD_INIT_NO_IDLE fix the issue you're seeing? > > > > I'll try it out in a bit... > > nope, same thing. > > [ 27.633235] omap_hwmod: debugss: _wait_target_disable failed OK, looking at the code, this makes sense. So here's what I'd suggest asking the hardware team: is the right approach to: 1. keep the DEBUGSS CLKCTRL MODULEMODE bitfield at 0x2 all the time, even when it's not in use or when entering chip low-power states, or 2. program the DEBUGSS CLKCTRL MODULEMODE bitfield to 0x0 when the DEBUGSS is not in use or when entering chip low-power states, but ignore the DEBUGSS CLKCTRL IDLEST register We'll need a new hwmod flag either way; the question is whether it should be something like HWMOD_CANNOT_DISABLE (case 1), or HWMOD_DISABLE_IGNORE_IDLEST (case 2). - Paul -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
