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authorMarc Zyngier <marc.zyngier@arm.com>2015-11-16 22:13:27 +0300
committerThomas Gleixner <tglx@linutronix.de>2015-11-17 16:25:58 +0300
commit92eda4ad4371225d6ccf9cded74315547e9a3153 (patch)
tree151830ddfb508dacb90b229191f9cd170d20e435 /drivers/irqchip
parent0eece2b22849c90b730815c893425a36b9d10fd5 (diff)
downloadlinux-92eda4ad4371225d6ccf9cded74315547e9a3153.tar.xz
irqchip/gic: Clear enable bits before restoring them
When restoring the GIC state (after a suspend/resume cycle, for example), the driver directly writes the 'enabled' state it has saved by accessing GICD_ISENABLERn, which performs an OR operation between the value present in the register and the value we write. If whatever code that has run before we reentered the kernel has enabled an interrupt that was previously disabled, we won't restore that disabled state. Making sure we first clear the register (by writting to GICD_ICENABLERn) before restoring the enabled state. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: <linux-arm-kernel@lists.infradead.org> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Russell King <linux@arm.linux.org.uk> Link: http://lkml.kernel.org/r/1447701208-18150-4-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-gic.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 515c823c1c95..bc846e7fec44 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -604,9 +604,12 @@ static void gic_dist_restore(unsigned int gic_nr)
writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
dist_base + GIC_DIST_TARGET + i * 4);
- for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
+ for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
+ writel_relaxed(GICD_INT_EN_CLR_X32,
+ dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
dist_base + GIC_DIST_ENABLE_SET + i * 4);
+ }
writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
}
@@ -654,8 +657,11 @@ static void gic_cpu_restore(unsigned int gic_nr)
return;
ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
- for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
+ for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
+ writel_relaxed(GICD_INT_EN_CLR_X32,
+ dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
+ }
ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
for (i = 0; i < DIV_ROUND_UP(32, 16); i++)