Re: [PATCH v2 01/11] msm: Add CPU queries

Daniel Walker
2011-01-25T17:35:43Z

On Mon, 2011-01-24 at 16:57 -0800, David Brown wrote:
> On Mon, Jan 24 2011, Daniel Walker wrote:
>
> > On Mon, 2011-01-24 at 16:20 -0800, David Brown wrote:
> >> On Mon, Jan 24 2011, Daniel Walker wrote:
> >>
> >> > On Wed, 2011-01-19 at 12:25 -0800, David Brown wrote:
> >> >> +#define cpu_is_msm7x01() 0
> >> >> +#define cpu_is_msm7x30() 0
> >> >> +#define cpu_is_qsd8x50() 0
> >> >> +#define cpu_is_msm8x60() 0
> >> >
> >> > Now that I look at this again, why not drop the "x" all together ?
> >>
> >> That might be better for the 8x60. The complexity is that most of the
> >> MSM chips have some variants, where the CPU running Linux isn't changed,
> >> but the modem CPU is different (think CDMA/UMTS). Until 8960, that was
> >> distinguished by the second letter.
> >>
> >> Either way doesn't quite match reality, unfortunately. There are
> >> devices using a MSM7201 and others using a MSM7601. As far as Linux is
> >> concerned, there isn't any difference between them. If someone wanted
> >> to try and identify the device they have with the code, it could be
> >> confusing for either name chosen.
> >>
> >> I was planning on turning msm8x60 into msm8660, since that seems to be
> >> the most common one. Perhaps the decoder ring should be put into the
> >> help text for the options so people can at least figure out which is
> >> which.
> >
> > Are there any of those which do , right now, have Linux support for more
> > than one variant ?
>
> All of them, in fact.
>
> MSM7201 and MSM7601 are identical as far as Linux is concerned. Same
> goes for MSM8250 and MSM8650. Our dev boards are a somewhat random mix
> of the two, and it doesn't matter which one you use.
>
> MSM8960 is a completely different chip, it just shares a similar name,
> to other chips.

If you break it down without the "x" then you can recreate the "x"
variant with the actual numerical identifier .. For 8660/8960 you just
would do as much of a unification as with the others.. You could still
use 8x60 to identify those two, you just wouldn't use it as often.

Daniel

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Sent by a consultant of the Qualcomm Innovation Center, Inc.