Input: tegra-kbc - enable key interrupt for wakeup

Enable keypress interrupt to support wakeup from low power state.

Signed-off-by: Rakesh Iyer <riyer@nvidia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index a136e2e..b307a46 100644 (file)
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -48,6 +48,7 @@
 #define KBC_FIFO_TH_CNT_SHIFT(cnt)     (cnt << 14)
 #define KBC_DEBOUNCE_CNT_SHIFT(cnt)    (cnt << 4)
 #define KBC_CONTROL_FIFO_CNT_INT_EN    (1 << 3)
+#define KBC_CONTROL_KEYPRESS_INT_EN    (1 << 1)
 #define KBC_CONTROL_KBC_EN             (1 << 0)
 
 /* KBC Interrupt Register */
@@ -356,6 +357,18 @@ static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable)
        writel(val, kbc->mmio + KBC_CONTROL_0);
 }
 
+static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable)
+{
+       u32 val;
+
+       val = readl(kbc->mmio + KBC_CONTROL_0);
+       if (enable)
+               val |= KBC_CONTROL_KEYPRESS_INT_EN;
+       else
+               val &= ~KBC_CONTROL_KEYPRESS_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;
@@ -831,6 +844,8 @@ static int tegra_kbc_suspend(struct device *dev)
                msleep(30);
 
                kbc->keypress_caused_wake = false;
+               /* Enable keypress interrupt before going into suspend. */
+               tegra_kbc_set_keypress_interrupt(kbc, true);
                enable_irq(kbc->irq);
                enable_irq_wake(kbc->irq);
        } else {
@@ -852,6 +867,8 @@ static int tegra_kbc_resume(struct device *dev)
        if (device_may_wakeup(&pdev->dev)) {
                disable_irq_wake(kbc->irq);
                tegra_kbc_setup_wakekeys(kbc, false);
+               /* We will use fifo interrupts for key detection. */
+               tegra_kbc_set_keypress_interrupt(kbc, false);
 
                /* Restore the resident time of continuous polling mode. */
                writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0);