linux-kernel - [PATCH] soc/tegra: pmc: Process wake events during resume

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Date:   Wed, 14 Sep 2022 04:38:31 +0000
From:   Petlozu Pravareshwar <petlozup@...dia.com>
To:     <jonathanh@...dia.com>, <thierry.reding@...il.com>,
        <p.zabel@...gutronix.de>, <dmitry.osipenko@...labora.com>,
        <ulf.hansson@...aro.org>, <kkartik@...dia.com>,
        <cai.huoqing@...ux.dev>, <spatra@...dia.com>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <petlozup@...dia.com>, Prathamesh Shete <pshete@...dia.com>
Subject: [PATCH] soc/tegra: pmc: Process wake events during resume

During PMC resume, translate tier2 SC7 wake sources back into
irqs and do generic_handle_irq() to invoke the interrupt handlers
for edge triggered wake events such as sw-wake.

Signed-off-by: Prathamesh Shete <pshete@...dia.com>
Signed-off-by: Petlozu Pravareshwar <petlozup@...dia.com>
---
 drivers/soc/tegra/pmc.c | 44 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 8c7b46ac6ad6..f275af15f2d0 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -27,6 +27,7 @@
 #include <linux/iopoll.h>
 #include <linux/irqdomain.h>
 #include <linux/irq.h>
+#include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/of_address.h>
 #include <linux/of_clk.h>
@@ -3181,6 +3182,40 @@ static void wke_clear_wake_status(void)
 				WAKE_AOWAKE_STATUS_W((i * 32) + wake));
 	}
 }
+
+/* translate sc7 wake sources back into irqs to catch edge triggered wakeups */
+static void process_wake_event(int index, u32 status)
+{
+	int irq;
+	irq_hw_number_t hwirq;
+	int wake;
+	unsigned long flags;
+	struct irq_desc *desc;
+	unsigned long ulong_status = (unsigned long)status;
+
+	dev_info(pmc->dev, "Wake[%d:%d]  status=0x%x\n", (index + 1) * 32,
+		index * 32, status);
+	for_each_set_bit(wake, &ulong_status, 32) {
+		hwirq = wake + 32 * index;
+
+#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
+		irq = irq_find_mapping(pmc->domain, hwirq);
+#else
+		irq = hwirq;
+#endif
+		desc = irq_to_desc(irq);
+		if (!desc || !desc->action || !desc->action->name) {
+			dev_info(pmc->dev, "Resume caused by WAKE%d, irq %d\n",
+				(wake + 32 * index), irq);
+			continue;
+		}
+		dev_info(pmc->dev, "Resume caused by WAKE%d, %s\n",
+			(wake + 32 * index), desc->action->name);
+		local_irq_save(flags);
+		generic_handle_irq(irq);
+		local_irq_restore(flags);
+	}
+}
 #endif /* CONFIG_ARM64 */
 
 static int tegra_pmc_suspend(struct device *dev)
@@ -3219,6 +3254,15 @@ static int tegra_pmc_resume(struct device *dev)
 	struct tegra_pmc *pmc = dev_get_drvdata(dev);
 
 	tegra_pmc_writel(pmc, 0x0, PMC_SCRATCH41);
+#else /* CONFIG_ARM64 */
+	int i;
+	u32 status;
+
+	for (i = 0; i < WAKE_NR_VECTORS; i++) {
+		status = readl(pmc->wake + WAKE_AOWAKE_STATUS_R(i));
+		status = status & readl(pmc->wake + WAKE_AOWAKE_TIER2_ROUTING(i));
+		process_wake_event(i, status);
+	}
 #endif
 
 	return 0;
-- 
2.17.1