On Sep 7, 2007, at 4:21 AM, Olof Johansson wrote:
Some versions of PWRficient 1682M have an interrupt controller in which
the first register in each pair for interrupt sources doesn't always
read with the right polarity/sense values.
To work around this, keep a software copy of the register instead.
Since
it's not modified from the mpic itself, it's a feasible solution.
Still,
keep it under a config option to avoid wasting memory on other
platforms.
Signed-off-by: Olof Johansson [EMAIL PROTECTED]
diff --git a/arch/powerpc/platforms/Kconfig
b/arch/powerpc/platforms/Kconfig
index 041df77..f2e7049 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -137,6 +137,18 @@ config MPIC_U3_HT_IRQS
depends on PPC_MAPLE
default y
+config MPIC_BROKEN_REGREAD
+ bool MPIC workaround for broken register reads
+ depends on MPIC
+ help
+ Say Y here to enable a MPIC driver workaround for some chips that
+ have a bug that causes some interrupt source information to not
+ read back properly. It is safe to use on other chips as well, but
+ enabling it uses about 8KB of memory to keep copies of the register
+ contents in software.
+
+ Say N if you are unsure.
+
I'm sorry, I didn't mean to imply it should be asked / selectable, just
that the help should be provided. I won't object to leaving it except
that it asks the average user unnecessary questions. In other words,
drop the question after bool.
milton
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