From: Rakesh Iyer <riyer@xxxxxxxxxx>
For wakeup to be reliable, kbc needs to be in interrupt mode before suspend.
Created common routine to control the FIFO interrupt.
Added synchronization to ensure orderly suspend.
Signed-off-by: Rakesh Iyer <riyer@xxxxxxxxxx>
---
v3: Simplified suspend path based on Dmitry Torokhov's suggestions.
v2: Incorporated Dmitry Torokhov's recommended changes.
v1: Initial Patch.
drivers/input/keyboard/tegra-kbc.c | 63 +++++++++++++++++++++++++----------
1 files changed, 45 insertions(+), 18 deletions(-)
diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index a5a7791..48ea03f 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -55,6 +55,7 @@
#define KBC_ROW_CFG0_0 0x8
#define KBC_COL_CFG0_0 0x18
+#define KBC_TO_CNT_0 0x24
#define KBC_INIT_DLY_0 0x28
#define KBC_RPT_DLY_0 0x2c
#define KBC_KP_ENT0_0 0x30
@@ -70,6 +71,7 @@ struct tegra_kbc {
spinlock_t lock;
unsigned int repoll_dly;
unsigned long cp_dly_jiffies;
+ unsigned int cp_to_wkup_dly;
bool use_fn_map;
bool use_ghost_filter;
const struct tegra_kbc_platform_data *pdata;
@@ -341,6 +343,18 @@ static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
kbc->num_pressed_keys = num_down;
}
+static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable)
+{
+ u32 val;
+
+ val = readl(kbc->mmio + KBC_CONTROL_0);
+ if (enable)
+ val |= KBC_CONTROL_FIFO_CNT_INT_EN;
+ else
+ val &= ~KBC_CONTROL_FIFO_CNT_INT_EN;
+ writel(val, kbc->mmio + KBC_CONTROL_0);
+}
+
static void tegra_kbc_keypress_timer(unsigned long data)
{
struct tegra_kbc *kbc = (struct tegra_kbc *)data;
@@ -370,9 +384,7 @@ static void tegra_kbc_keypress_timer(unsigned long data)
/* All keys are released so enable the keypress interrupt */
spin_lock_irqsave(&kbc->lock, flags);
- val = readl(kbc->mmio + KBC_CONTROL_0);
- val |= KBC_CONTROL_FIFO_CNT_INT_EN;
- writel(val, kbc->mmio + KBC_CONTROL_0);
+ tegra_kbc_set_fifo_interrupt(kbc, true);
spin_unlock_irqrestore(&kbc->lock, flags);
}
}
@@ -380,15 +392,13 @@ static void tegra_kbc_keypress_timer(unsigned long data)
static irqreturn_t tegra_kbc_isr(int irq, void *args)
{
struct tegra_kbc *kbc = args;
- u32 val, ctl;
+ u32 val;
/*
* Until all keys are released, defer further processing to
* the polling loop in tegra_kbc_keypress_timer
*/
- ctl = readl(kbc->mmio + KBC_CONTROL_0);
- ctl &= ~KBC_CONTROL_FIFO_CNT_INT_EN;
- writel(ctl, kbc->mmio + KBC_CONTROL_0);
+ tegra_kbc_set_fifo_interrupt(kbc, false);
/*
* Quickly bail out & reenable interrupts if the fifo threshold
@@ -397,16 +407,14 @@ static irqreturn_t tegra_kbc_isr(int irq, void *args)
val = readl(kbc->mmio + KBC_INT_0);
writel(val, kbc->mmio + KBC_INT_0);
- if (val & KBC_INT_FIFO_CNT_INT_STATUS) {
+ if (val & KBC_INT_FIFO_CNT_INT_STATUS)
/*
* Schedule timer to run when hardware is in continuous
* polling mode.
*/
mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies);
- } else {
- ctl |= KBC_CONTROL_FIFO_CNT_INT_EN;
- writel(ctl, kbc->mmio + KBC_CONTROL_0);
- }
+ else
+ tegra_kbc_set_fifo_interrupt(kbc, true);
return IRQ_HANDLED;
}
@@ -734,18 +742,30 @@ static int tegra_kbc_suspend(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
struct tegra_kbc *kbc = platform_get_drvdata(pdev);
+ mutex_lock(&kbc->idev->mutex);
if (device_may_wakeup(&pdev->dev)) {
- tegra_kbc_setup_wakekeys(kbc, true);
- enable_irq_wake(kbc->irq);
+ disable_irq(kbc->irq);
+ del_timer_sync(&kbc->timer);
+ tegra_kbc_set_fifo_interrupt(kbc, false);
+
/* Forcefully clear the interrupt status */
writel(0x7, kbc->mmio + KBC_INT_0);
+ /*
+ * Store the previous resident time of continuous polling mode.
+ * Force the keyboard into interrupt mode.
+ */
+ kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0);
+ writel(0, kbc->mmio + KBC_TO_CNT_0);
+
+ tegra_kbc_setup_wakekeys(kbc, true);
msleep(30);
+
+ enable_irq_wake(kbc->irq);
} else {
- mutex_lock(&kbc->idev->mutex);
if (kbc->idev->users)
tegra_kbc_stop(kbc);
- mutex_unlock(&kbc->idev->mutex);
}
+ mutex_unlock(&kbc->idev->mutex);
return 0;
}
@@ -756,15 +776,22 @@ static int tegra_kbc_resume(struct device *dev)
struct tegra_kbc *kbc = platform_get_drvdata(pdev);
int err = 0;
+ mutex_lock(&kbc->idev->mutex);
if (device_may_wakeup(&pdev->dev)) {
disable_irq_wake(kbc->irq);
tegra_kbc_setup_wakekeys(kbc, false);
+
+ /* Restore the resident time of continuous polling mode. */
+ writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0);
+
+ tegra_kbc_set_fifo_interrupt(kbc, true);
+
+ enable_irq(kbc->irq);
} else {
- mutex_lock(&kbc->idev->mutex);
if (kbc->idev->users)
err = tegra_kbc_start(kbc);
- mutex_unlock(&kbc->idev->mutex);
}
+ mutex_unlock(&kbc->idev->mutex);
return err;
}
--
1.7.1
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