linux-kernel - [PATCH] irqchip/atmel-aic5: handle suspend to RAM

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Date:   Thu,  6 Apr 2017 18:17:53 +0200
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] irqchip/atmel-aic5: handle suspend to RAM

On sama5d2, VDD core may be cut while suspending to RAM. This means the
AIC5 registers content is lost. Restore it at resume time.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 drivers/irqchip/irq-atmel-aic5.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c
index 2a624d87a035..ddbf60251b0e 100644
--- a/drivers/irqchip/irq-atmel-aic5.c
+++ b/drivers/irqchip/irq-atmel-aic5.c
@@ -150,6 +150,8 @@ static int aic5_set_type(struct irq_data *d, unsigned type)
 }
 
 #ifdef CONFIG_PM
+u32 smr_cache[128];
+
 static void aic5_suspend(struct irq_data *d)
 {
 	struct irq_domain *domain = d->domain;
@@ -159,6 +161,11 @@ static void aic5_suspend(struct irq_data *d)
 	int i;
 	u32 mask;
 
+	for (i = 0; i < domain->revmap_size; i++) {
+		irq_reg_writel(bgc, i, AT91_AIC5_SSR);
+		smr_cache[i] = irq_reg_readl(bgc, AT91_AIC5_SMR);
+	}
+
 	irq_gc_lock(bgc);
 	for (i = 0; i < dgc->irqs_per_chip; i++) {
 		mask = 1 << i;
@@ -184,10 +191,16 @@ static void aic5_resume(struct irq_data *d)
 	u32 mask;
 
 	irq_gc_lock(bgc);
+
+	irq_reg_writel(bgc, 0xffffffff, AT91_AIC5_SPU);
+	for (i = 0; i < domain->revmap_size; i++) {
+		irq_reg_writel(bgc, i, AT91_AIC5_SSR);
+		irq_reg_writel(bgc, i, AT91_AIC5_SVR);
+		irq_reg_writel(bgc, smr_cache[i], AT91_AIC5_SMR);
+	}
+
 	for (i = 0; i < dgc->irqs_per_chip; i++) {
 		mask = 1 << i;
-		if ((mask & gc->mask_cache) == (mask & gc->wake_active))
-			continue;
 
 		irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 		if (mask & gc->mask_cache)
-- 
2.11.0