Messages in this thread | | | Date | Fri, 2 Jan 2015 09:29:35 -0800 | From | Tony Lindgren <> | Subject | Re: [PATCH] ARM: OMAP2+: hwmod: Fix _wait_target_ready() for hwmods without sysc |
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* Roger Quadros <rogerq@ti.com> [141219 01:08]: > Lokesh, > > On 19/12/14 07:21, Lokesh Vutla wrote: > > Hi Roger, > > On Thursday 18 December 2014 09:22 PM, Roger Quadros wrote: > >> Fixing up Paul's email id. > >> > >> cheers, > >> -roger > >> > >> On 18/12/14 17:49, Roger Quadros wrote: > >>> There are quite a few hwmods that don't have sysconfig register and so > >>> _find_mpu_rt_port(oh) will return NULL thus preventing ready state check > >>> on those modules after the module is enabled. > >>> > >>> This can potentially cause a bus access error if the module is accessed > >>> before the module is ready. > >>> > >>> Get rid of the redundant _find_mpu_rt_port() check from the _wait_target_ready() > >>> funcion for all the SoCs. The following PRCM register access that checks the > >>> module ready state has nothing to do with module's SYSCONFIG or mpu_rt_port. > > Yes, makes sense. This patch looks good to me. > > Tested this on AM437x-gp-evm.
Roger, if the modules don't have sysconfig registers, care to check if we actually really need hwmod for those modules then?
I know hwmod is managing runtime PM gate clocks for devices with clkctrl_offs. But if that's all we need hwmod for in the non-sysc cases, then it might make sense to manage the gate clocks in the clock framework directly instead for those devices.
Of course that's more of a long term project, but at least we should be aware of the dependencies here :)
> > May be good idea to warn every time if enabling of module is failed? > > Unrelated to this patch though. > > Yes, failing to be ready is serious enough for a warning. Care to send a separate patch for that?
Yeah that sounds like a separate patch.
Regards,
Tony
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