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Input: tegra-kbc - fix wakeup from suspend

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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@nvidia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Rakesh Iyer 2011-09-08 15:34:11 -07:00 committed by Dmitry Torokhov
parent 9299c08d8b
commit d0d150ec28
1 changed files with 43 additions and 15 deletions
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58
drivers/input/keyboard/tegra-kbc.c
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@ -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
@ -404,8 +414,7 @@ static irqreturn_t tegra_kbc_isr(int irq, void *args)
*/
mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies);
} else {
ctl |= KBC_CONTROL_FIFO_CNT_INT_EN;
writel(ctl, kbc->mmio + KBC_CONTROL_0);
tegra_kbc_set_fifo_interrupt(kbc, true);
}
return IRQ_HANDLED;
@ -734,18 +743,30 @@ 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 +777,22 @@ 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;
}