Nitrous: avoid the host CPU entering runtime power mode while BT

is transferring

When BT UART is transferring, to notify cpupm driver "system busy"
in order to block the host CPU enter runtime power mode (SCID).

Bug: 185910799
Bug: 185732896
Bug: 180436653
Test: BT On/Off stress test
Change-Id: Ieaadee56a2c0f2bf62a4dc97664ca595205c6e70
Signed-off-by: jonerlin <jonerlin@google.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/nitrous.c b/nitrous.c
index cd07a65..ca7b91b 100644
--- a/nitrous.c
+++ b/nitrous.c
@@ -20,6 +20,10 @@
 #include <misc/logbuffer.h>
 #include <linux/kfifo.h>
 #include <linux/slab.h>
+#include <soc/google/exynos-cpupm.h>
+
+#define STATUS_IDLE	1
+#define STATUS_BUSY	0
 
 #define NITROUS_AUTOSUSPEND_DELAY   	1000 /* autosleep delay 1000 ms */
 #define TIMESYNC_TIMESTAMP_MAX_QUEUE	16
@@ -52,6 +56,7 @@ struct nitrous_bt_lpm {
 	bool lpm_enabled;
 	struct nitrous_lpm_proc *proc;
 	struct logbuffer *log;
+	int idle_btip_index;
 };
 
 #define PROC_BTWAKE	0
@@ -91,6 +96,7 @@ static void nitrous_prepare_uart_tx_locked(struct nitrous_bt_lpm *lpm)
 
 	pm_runtime_get_sync(lpm->dev);
 	/* Shall be resumed here */
+	exynos_update_ip_idle_status(lpm->idle_btip_index, STATUS_BUSY);
 	logbuffer_log(lpm->log, "uart_tx_locked");
 	pm_runtime_mark_last_busy(lpm->dev);
 	pm_runtime_put_autosuspend(lpm->dev);
@@ -115,6 +121,7 @@ static irqreturn_t nitrous_host_wake_isr(int irq, void *data)
 	}
 
 	pm_runtime_get(lpm->dev);
+	exynos_update_ip_idle_status(lpm->idle_btip_index, STATUS_BUSY);
 	logbuffer_log(lpm->log, "host_wake_isr");
 	pm_runtime_mark_last_busy(lpm->dev);
 	pm_runtime_put_autosuspend(lpm->dev);
@@ -489,6 +496,7 @@ static int nitrous_rfkill_set_power(void *data, bool blocked)
 
 		dev_dbg(lpm->dev, "DEV_WAKE: High");
 		gpiod_set_value_cansleep(lpm->gpio_dev_wake, true);
+		exynos_update_ip_idle_status(lpm->idle_btip_index, STATUS_BUSY);
 	} else {
 		dev_dbg(lpm->dev, "DEV_WAKE: Low");
 		gpiod_set_value_cansleep(lpm->gpio_dev_wake, false);
@@ -496,6 +504,7 @@ static int nitrous_rfkill_set_power(void *data, bool blocked)
 		/* Power down the BT chip */
 		dev_dbg(lpm->dev, "REG_ON: Low");
 		logbuffer_log(lpm->log, "Power down BT chip");
+		exynos_update_ip_idle_status(lpm->idle_btip_index, STATUS_IDLE);
 		gpiod_set_value_cansleep(lpm->gpio_power, false);
 	}
 	lpm->rfkill_blocked = blocked;
@@ -560,13 +569,12 @@ static int nitrous_probe(struct platform_device *pdev)
 	struct nitrous_bt_lpm *lpm;
 	int rc = 0;
 
-	dev_dbg(lpm->dev, "nitrous_probe\n");
-
 	lpm = devm_kzalloc(dev, sizeof(struct nitrous_bt_lpm), GFP_KERNEL);
 	if (!lpm)
 		return -ENOMEM;
 
 	lpm->dev = dev;
+	dev_dbg(lpm->dev, "probe:\n");
 
 	if (device_property_read_u32(dev, "wake-polarity", &lpm->wake_polarity)) {
 		dev_warn(lpm->dev, "Wake polarity not in dev tree\n");
@@ -623,6 +631,9 @@ static int nitrous_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, lpm);
 
+	lpm->idle_btip_index = exynos_get_idle_ip_index("bluetooth");
+	exynos_update_ip_idle_status(lpm->idle_btip_index, STATUS_IDLE);
+
 	logbuffer_log(lpm->log, "probe: successful");
 
 	return rc;
@@ -666,6 +677,7 @@ static int nitrous_suspend_device(struct device *dev)
 		(lpm->is_suspended ? "asleep" : "awake"));
 
 	nitrous_wake_controller(lpm, false);
+	exynos_update_ip_idle_status(lpm->idle_btip_index, STATUS_IDLE);
 	lpm->is_suspended = true;
 
 	return 0;
@@ -681,6 +693,7 @@ static int nitrous_resume_device(struct device *dev)
 		(lpm->is_suspended ? "asleep" : "awake"));
 
 	nitrous_wake_controller(lpm, true);
+	exynos_update_ip_idle_status(lpm->idle_btip_index, STATUS_BUSY);
 	lpm->is_suspended = false;
 
 	return 0;