ARM: tegra: bbc: fix missed mem_req interrupt

The mem_req and mem_req_soon interrupt are being missed if they
are set trigger on rising edge. The transition for mem_req_soon HIGH
to mem_req LOW is happening quicker than software can reenable
those signals. Therefore the mem_req LOW edge will be missed resulting
in no interrupt.

Fix this by making those interrupts as level HIGH interrupts.
And after handing IRQ make them as edge again to mark them as clear
otherwise the respective signal remains at their state until
next BBC transition.

Re-enable mem_req and mem_req_soon interrupts at resume.

Bug 1288726
Bug 1287648

Change-Id: Id191f56b8e4c4a2e97843ff4853ac888f4b545d0
Signed-off-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-on: http://git-master/r/228610
Reviewed-by: Neil Patel <neilp@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Steve Lin <stlin@nvidia.com>
Reviewed-by: Peter Hsiang <phsiang@nvidia.com>

1 files changed, 33 insertions, 9 deletions

diff --git a/arch/arm/mach-tegra/tegra_bb.c b/arch/arm/mach-tegra/tegra_bb.c
index 49edccf336f5..722b57588fea 100644
--- a/arch/arm/mach-tegra/tegra_bb.c
+++ b/arch/arm/mach-tegra/tegra_bb.c
@@ -25,6 +25,7 @@
 #include <linux/mm.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/delay.h>
 #include <asm/io.h>
 #include <linux/regulator/consumer.h>
@@ -230,10 +231,7 @@ void tegra_bb_generate_ipc(struct platform_device *pdev)
 #else
 	{
 		u32 sts = readl(flow + FLOW_CTLR_IPC_FLOW_IPC_STS_0);
-		sts |= 1 << FLOW_CTLR_IPC_FLOW_IPC_SET_0_AP2BB_INT0_STS_SHIFT |
-		(0x8 << FLOW_CTLR_IPC_FLOW_IPC_STS_0_AP2BB_MSC_STS_SHIFT);
-
-		/* unmask mem_req_soon interrupt */
+		sts |= 1 << FLOW_CTLR_IPC_FLOW_IPC_SET_0_AP2BB_INT0_STS_SHIFT;
 		writel(sts, flow + FLOW_CTLR_IPC_FLOW_IPC_SET_0);
 	}
 #endif
@@ -785,6 +783,7 @@ static irqreturn_t tegra_bb_mem_req_soon(int irq, void *data)
 		writel((0x8 << FLOW_CTLR_IPC_FLOW_IPC_STS_0_AP2BB_MSC_STS_SHIFT)
 				, fctrl + FLOW_CTLR_IPC_FLOW_IPC_CLR_0);
 
+		irq_set_irq_type(bb->mem_req_soon, IRQF_TRIGGER_RISING);
 		bb->state = BBC_SET_FLOOR;
 		queue_work(bb->workqueue, &bb->work);
 	}
@@ -827,8 +826,10 @@ static void tegra_bb_enable_pmc_wake(void)
 	reg &= ~(PMC_WAKE2_BB_MEM_REQ);
 	pmc_32kwritel(reg, PMC_WAKE2_LEVEL);
 
+	usleep_range(1000, 1100);
 	pmc_32kwritel(1, PMC_AUTO_WAKE_LVL);
 
+	usleep_range(1000, 1100);
 	reg = readl(pmc + PMC_WAKE2_MASK);
 	reg |= PMC_WAKE2_BB_MEM_REQ;
 	pmc_32kwritel(reg, PMC_WAKE2_MASK);
@@ -850,7 +851,7 @@ static irqreturn_t tegra_pmc_wake_intr(int irq, void *data)
 
 	spin_lock(&bb->lock);
 	sts = readl(pmc + APBDEV_PMC_IPC_PMC_IPC_STS_0);
-	mem_req = sts & (1 << APBDEV_PMC_IPC_PMC_IPC_STS_0_BB2AP_MEM_REQ_SHIFT);
+	mem_req = (sts >> APBDEV_PMC_IPC_PMC_IPC_STS_0_BB2AP_MEM_REQ_SHIFT) & 1;
 
 	/* clear interrupt */
 	lic = readl(tert_ictlr + TRI_ICTLR_VIRQ_CPU);
@@ -860,9 +861,8 @@ static irqreturn_t tegra_pmc_wake_intr(int irq, void *data)
 				tert_ictlr + TRI_ICTLR_CPU_IER_CLR);
 	}
 
+	irq_set_irq_type(INT_PMC_WAKE_INT, IRQF_TRIGGER_RISING);
 	if (!mem_req) {
-		/* reenable mem_req_soon irq */
-		tegra_bb_enable_mem_req_soon();
 
 		bb->state = BBC_REMOVE_FLOOR;
 		queue_work(bb->workqueue, &bb->work);
@@ -888,7 +888,6 @@ static void tegra_bb_emc_dvfs(struct work_struct *work)
 
 	switch (bb->state) {
 	case BBC_SET_FLOOR:
-		tegra_bb_enable_pmc_wake();
 		bb->prev_state = bb->state;
 		spin_unlock_irqrestore(&bb->lock, flags);
 
@@ -899,6 +898,9 @@ static void tegra_bb_emc_dvfs(struct work_struct *work)
 		clk_set_rate(bb->emc_clk, emc_min_freq);
 		pr_debug("bbc setting floor to %lu\n", emc_min_freq/1000000);
 
+		/* reenable pmc_wake_det irq */
+		tegra_bb_enable_pmc_wake();
+		irq_set_irq_type(INT_PMC_WAKE_INT, IRQF_TRIGGER_HIGH);
 		return;
 	case BBC_REMOVE_FLOOR:
 		/* discard erroneous request */
@@ -916,6 +918,9 @@ static void tegra_bb_emc_dvfs(struct work_struct *work)
 		clk_disable_unprepare(bb->emc_clk);
 		pr_debug("bbc removing emc floor\n");
 
+		/* reenable mem_req_soon irq */
+		tegra_bb_enable_mem_req_soon();
+		irq_set_irq_type(bb->mem_req_soon, IRQF_TRIGGER_HIGH);
 		return;
 	default:
 		spin_unlock_irqrestore(&bb->lock, flags);
@@ -1201,7 +1206,6 @@ static int tegra_bb_probe(struct platform_device *pdev)
 		kfree(bb);
 		return -EAGAIN;
 	}
-	tegra_bb_enable_pmc_wake();
 
 #endif
 	return 0;
@@ -1226,9 +1230,29 @@ static int tegra_bb_suspend(struct platform_device *pdev, pm_message_t state)
 
 static int tegra_bb_resume(struct platform_device *pdev)
 {
+#ifndef CONFIG_TEGRA_BASEBAND_SIMU
+	struct tegra_bb *bb;
+	struct tegra_bb_platform_data *pdata;
+#endif
+	if (!pdev) {
+		pr_err("%s platform device is NULL!\n", __func__);
+		return -EINVAL;
+	}
 	dev_dbg(&pdev->dev, "%s\n", __func__);
+
 #ifndef CONFIG_TEGRA_BASEBAND_SIMU
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "%s platform dev not found!\n", __func__);
+		return -EINVAL;
+	}
+	bb = (struct tegra_bb *)pdata->bb_handle;
+
 	tegra_bb_enable_mem_req_soon();
+	irq_set_irq_type(bb->mem_req_soon, IRQF_TRIGGER_HIGH);
+
+	tegra_bb_enable_pmc_wake();
+	irq_set_irq_type(INT_PMC_WAKE_INT, IRQF_TRIGGER_HIGH);
 #endif
 	return 0;
 }