diff options
| author | Mark A. Greer | 2012-04-30 16:57:09 -0700 |
|---|---|---|
| committer | Kevin Hilman | 2012-05-11 16:47:19 -0700 |
| commit | 1ce029968718477149e7f1fb245a8e82c690cc4a (patch) | |
| tree | b86b1a0bd788cd7e0e7f759bcf71ad96df6e1bb0 /arch/arm | |
| parent | 99b59df04899a048d1a3ed8bc2b1263779816868 (diff) | |
arm: omap3: am35x: Don't mark missing features as present
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@animalcreek.com>
[khilman@ti.com: use soc_is_am35xx() instead of cpu_is_am35xx()]
Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-omap2/id.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c index f611e3097157..38ae74f8e77a 100644 --- a/arch/arm/mach-omap2/id.c +++ b/arch/arm/mach-omap2/id.c @@ -247,6 +247,17 @@ 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 (soc_is_am35xx()) + omap_features &= ~(OMAP3_HAS_IVA | OMAP3_HAS_ISP); + + /* * TODO: Get additional info (where applicable) * e.g. Size of L2 cache. */ |