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Input: imx_keypad - reset the hardware before enabling 

Ensure the hardware is correctly initialized before requesting the
interrupt, otherwise if a key was already touched since power-on the
kernel enters an interrupt loop. To fix this issue we clear pending
interrupt sources. We also have to make sure clk is enabled while
changing the keypad registers.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Michael Grzeschik 2012-08-21 21:57:15 -07:00 committed by Dmitry Torokhov
parent a1d0fa7768
commit f35dd69ba3
1 changed files with 3 additions and 0 deletions
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3
drivers/input/keyboard/imx_keypad.c
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@ -358,6 +358,7 @@ static void imx_keypad_inhibit(struct imx_keypad *keypad)
/* Inhibit KDI and KRI interrupts. */
reg_val = readw(keypad->mmio_base + KPSR);
reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE);
reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD;
writew(reg_val, keypad->mmio_base + KPSR);
/* Colums as open drain and disable all rows */
@ -515,7 +516,9 @@ static int __devinit imx_keypad_probe(struct platform_device *pdev)
input_set_drvdata(input_dev, keypad);
/* Ensure that the keypad will stay dormant until opened */
clk_enable(keypad->clk);
imx_keypad_inhibit(keypad);
clk_disable(keypad->clk);
error = request_irq(irq, imx_keypad_irq_handler, 0,
pdev->name, keypad);