linux-kernel - [PATCH 5/5] irqchip/gic-pm: fix suspend handling

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Date:   Wed, 13 Mar 2019 16:32:36 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     <tglx@...utronix.de>, <jason@...edaemon.net>,
        <marc.zyngier@....com>, <will.deacon@....com>,
        <catalin.marinas@....com>, <heiko@...ech.de>,
        <horms+renesas@...ge.net.au>, <maxime.ripard@...tlin.com>,
        <andy.gross@...aro.org>, <olof@...om.net>,
        <bjorn.andersson@...aro.org>, <jagan@...rulasolutions.com>,
        <enric.balletbo@...labora.com>, <stefan.wahren@...e.com>,
        <ezequiel@...labora.com>, <marc.w.gonzalez@...e.fr>,
        <christoffer.dall@....com>, <drjones@...hat.com>,
        <julien.thierry@....com>
CC:     <treding@...dia.com>, <jonathanh@...dia.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Sameer Pujar <spujar@...dia.com>
Subject: [PATCH 5/5] irqchip/gic-pm: fix suspend handling

If interrupts are enabled for a non-root GIC device that uses the
gic-pm driver, when system suspend occurs, the current interrupt
state is not saved and restored correctly and so interrupts do not
work again on resuming the system. Add a late suspend handler to
save and restore the state for these devices.

Suggested-by: Jonathan Hunter <jonathanh@...dia.com>
Signed-off-by: Sameer Pujar <spujar@...dia.com>
---
 drivers/irqchip/irq-gic-pm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/irqchip/irq-gic-pm.c b/drivers/irqchip/irq-gic-pm.c
index b5405df..583858d 100644
--- a/drivers/irqchip/irq-gic-pm.c
+++ b/drivers/irqchip/irq-gic-pm.c
@@ -180,6 +180,8 @@ static int gic_remove(struct platform_device *pdev)
 static const struct dev_pm_ops gic_pm_ops = {
 	SET_RUNTIME_PM_OPS(gic_runtime_suspend,
 			   gic_runtime_resume, NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
 };
 
 static const char * const gic400_clocks[] = {
-- 
2.7.4