[PATCH v3 5/6] arm: exynos: Add MCPM call-back functions

[Abhilash Kesavan]

Hi Nicolas,

On Wed, Apr 30, 2014 at 12:19 AM, Nicolas Pitre
<nicolas.pitre at linaro.org> wrote:
> On Tue, 29 Apr 2014, Abhilash Kesavan wrote:
>
>> >> +/*
>> >> + * Enable cluster-level coherency, in preparation for turning on the MMU.
>> >> + */
>> >> +static void __naked exynos_pm_power_up_setup(unsigned int affinity_level)
>> >> +{
>> >> +       asm volatile ("\n"
>> >> +       "cmp    r0, #1\n"
>> >> +       "bxne   lr\n"
>> >> +       "b      cci_enable_port_for_self");
>> >> +}
>> >
>> > How many times are we going to duplicate this function before we decide
>> > to move it to a common header ?
>> I see this being used in arch/arm/mach-vexpress/tc2_pm.c (where I
>> copied it from for exynos) and arch/arm/mach-vexpress/dcscb.c. A
>> common function named "mcpm_default_power_up_setup" in the mcpm header
>> would be acceptable ?
>
> Not necessarily.
>
> First of all, this can't be a static inline as we need a pointer to it.
> And moving this to a header would create multiple instances of the same
> function in a multiplatform build for example.
>
> Furthermore, this can't be called "default_power_up_setup" as this is
> specific to systems with a CCI.
>
> It is true that the code in dcscb_setup.S does the same thing as this
> 3-line inline assembly, but the former is heavily commented and may
> serve as an example template for platforms that may require something
> more sophisticated here.
>
> There are other patterns that seem to emerge as more MCPM backends are
> being submitted.  I'm making a list of them and I intend to address such
> duplications after those backends do hit mainline.
OK. I'll keep the power_up_setup code in the exynos mcpm backend as it is.
Are there any other comments that you have or should I re-post a new
version that handles Lorenzo's comments.

Regards,
Abhilash
>
>
> Nicolas