On Thu, Jul 17, 2014 at 05:23:44PM +0200, Tomasz Figa wrote: > Certain GIC implementation, namely those found on earlier, single > cluster, Exynos SoCs, have registers mapped without per-CPU banking, > which means that the driver needs to use different offset for each CPU. > > Currently the driver calculates the offset by multiplying value returned > by cpu_logical_map() by CPU offset parsed from DT. This is correct when > CPU topology is not specified in DT and aforementioned function returns > core ID alone. However when DT contains CPU topology, the function > changes to return cluster ID as well, which is non-zero on mentioned > SoCs and so breaks the calculation in GIC driver. > > This patch fixes this by masking out cluster ID in CPU offset > calculation so that only core ID is considered. Multi-cluster Exynos > SoCs already have banked GIC implementations, so this simple fix should > be enough. > > Reported-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> > Reported-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> > Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx> > --- > drivers/irqchip/irq-gic.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c > index ddee133..5c15a09 100644 > --- a/drivers/irqchip/irq-gic.c > +++ b/drivers/irqchip/irq-gic.c > @@ -40,6 +40,7 @@ > #include <linux/irqchip/chained_irq.h> > #include <linux/irqchip/arm-gic.h> Applied to irqchip/urgent and Cc'd to stable for v3.3+ thx, Jason. -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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