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irqchip/gic: Don't unnecessarily write the IRQ configuration

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If the interrupt configuration matches the current configuration, then
don't bother writing the configuration again.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Jon Hunter 2016-05-10 16:14:38 +01:00 • committed by Marc Zyngier
parent a2a8fa5563
commit ec1a454d61
1 changed files with 6 additions and 2 deletions
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8
drivers/irqchip/irq-gic-common.c
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@ -50,13 +50,17 @@ int gic_configure_irq(unsigned int irq, unsigned int type,
else if (type & IRQ_TYPE_EDGE_BOTH) else if (type & IRQ_TYPE_EDGE_BOTH)
val |= confmask; val |= confmask;
/* If the current configuration is the same, then we are done */
if (val == oldval)
return 0;
/* /*
* Write back the new configuration, and possibly re-enable * Write back the new configuration, and possibly re-enable
* the interrupt. If we tried to write a new configuration and failed, * the interrupt. If we fail to write a new configuration,
* return an error. * return an error.
*/ */
writel_relaxed(val, base + GIC_DIST_CONFIG + confoff); writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val && val != oldval) if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val)
ret = -EINVAL; ret = -EINVAL;
if (sync_access) if (sync_access)