Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ec1a454d authored by Jon Hunter's avatar Jon Hunter Committed by Marc Zyngier
Browse files

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



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

Signed-off-by: default avatarJon Hunter <jonathanh@nvidia.com>
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent a2a8fa55

drivers/irqchip/irq-gic-common.c

+6 −2
Original line number Diff line number Diff line
@@ -50,13 +50,17 @@ int gic_configure_irq(unsigned int irq, unsigned int type, 
	else if (type & IRQ_TYPE_EDGE_BOTH)

		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

	 * 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.

	 */

	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;



	if (sync_access)