[PATCH] arm: omap3: am35x: Don't mark missing features as present
Mark A. Greer
mgreer at animalcreek.com
Fri Apr 27 17:30:02 EDT 2012
On Fri, Apr 27, 2012 at 02:21:59PM -0700, Kevin Hilman wrote:
> "Mark A. Greer" <mgreer at animalcreek.com> writes:
>
> > From: "Mark A. Greer" <mgreer at animalcreek.com>
> >
> > The Chip Identification register on the am35x family of SoCs
> > has bits 12, 7:5, and 3:2 marked as reserved and are read as
> > zeroes. Unfortunately, on other omap SoCs, a 0 bit means a
> > feature is "Full Use" so the OMAP3_CHECK_FEATURE() macro
> > called by omap3_check_features() will incorrectly interpret
> > those zeroes to mean that a feature is present even though it
> > isn't. To fix that, the feature bits that are incorrectly
> > set (namely, OMAP3_HAS_IVA and OMAP3_HAS_ISP) need to be
> > cleared after all of the calls to OMAP3_CHECK_FEATURE() in
> > omap3_check_features() are made.
> >
> > Signed-off-by: Mark A. Greer <mgreer at animalcreek.com>
> > ---
> > arch/arm/mach-omap2/id.c | 11 +++++++++++
> > 1 file changed, 11 insertions(+)
> >
> > diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
> > index 0e79b7b..9736049 100644
> > --- a/arch/arm/mach-omap2/id.c
> > +++ b/arch/arm/mach-omap2/id.c
> > @@ -248,6 +248,17 @@ void __init omap3xxx_check_features(void)
> > omap_features |= OMAP3_HAS_SDRC;
> >
> > /*
> > + * am35x fixups:
> > + * - The am35x Chip ID register has bits 12, 7:5, and 3:2 marked as
> > + * reserved and therefore return 0 when read. Unfortunately,
> > + * OMAP3_CHECK_FEATURE() will interpret some of those zeroes to
> > + * mean that a feature is present even though it isn't so clear
> > + * the incorrectly set feature bits.
> > + */
> > + if (cpu_is_omap3505() || cpu_is_omap3517())
> > + omap_features &= ~(OMAP3_HAS_IVA | OMAP3_HAS_ISP);
>
> I just sent a series that removes these cpu_is macros:
>
> http://marc.info/?l=linux-omap&m=133548306205953&w=2
>
> It looks like I can just replace the above with 'if (cpu_is_am35xx()', correct?
Yes.
> Since you have various AM35x devices, could you could give my series a
> spin and make this change? If it works, and acked-by/tested-by on my
> series would be appreciated as well.
Sure. I already have them ported to your series. I have to leave early
today but I'll test them & get them to you on Monday. Sorry for the delay.
Mark
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