From 84b63ad8477c822edbeb1e310b201609f33522ec Mon Sep 17 00:00:00 2001 From: Naveen Kumar Gaddipati Date: Mon, 25 Jun 2012 00:34:36 -0700 Subject: [PATCH] Input: nomadik-ske-keypad - get rid of multiple interrupts The keypad could cause multiple interrupts to be fired in succession since we weren't waiting for the IRQs to clear properly in the interrupt handler. We wait for a number of bus iterations (the readl():s from the peripheral bus will stall, so these are quite long) before giving up on getting keys ready to read, then we sleep until the IRQ is deasserted (this is OK since the interrupt is threaded). Also use the debounce platform data for another hardcoded wait loop. Signed-off-by: Naveen Kumar Gaddipati Reviewed-by: Rikard Olsson Reviewed-by: Srinidhi Kasagar Signed-off-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/nomadik-ske-keypad.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/input/keyboard/nomadik-ske-keypad.c b/drivers/input/keyboard/nomadik-ske-keypad.c index 6857454bb13..a880e741420 100644 --- a/drivers/input/keyboard/nomadik-ske-keypad.c +++ b/drivers/input/keyboard/nomadik-ske-keypad.c @@ -49,6 +49,7 @@ #define SKE_ASR3 0x2C #define SKE_NUM_ASRX_REGISTERS (4) +#define KEY_PRESSED_DELAY 10 /** * struct ske_keypad - data structure used by keypad driver @@ -92,7 +93,7 @@ static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr, static int __init ske_keypad_chip_init(struct ske_keypad *keypad) { u32 value; - int timeout = 50; + int timeout = keypad->board->debounce_ms; /* check SKE_RIS to be 0 */ while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--) @@ -196,18 +197,22 @@ static void ske_keypad_read_data(struct ske_keypad *keypad) static irqreturn_t ske_keypad_irq(int irq, void *dev_id) { struct ske_keypad *keypad = dev_id; - int retries = 20; + int timeout = keypad->board->debounce_ms; /* disable auto scan interrupt; mask the interrupt generated */ ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0); ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA); - while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --retries) + while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout) cpu_relax(); /* SKEx registers are stable and can be read */ ske_keypad_read_data(keypad); + /* wait until raw interrupt is clear */ + while ((readl(keypad->reg_base + SKE_RIS)) && --timeout) + msleep(KEY_PRESSED_DELAY); + /* enable auto scan interrupts */ ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA); -- 2.41.0