UBUNTU: SAUCE: pinctrl/amd: Remove the default de-bounce time

In the function amd_gpio_irq_enable and amd_gpio_direction_input, remove the code which is setting the default de-bounce time to 2.75ms.

The driver code shall use the same settings as specified in BIOS.
Any default assignment impacts TouchPad behaviour when the LevelTrig is set to EDGE FALLING.

The original patch: http://www.spinics.net/lists/stable/msg139761.html

BugLink: http://bugs.launchpad.net/bugs/1612006Reviewed-by: Ken Xue <Ken.Xue@amd.com>
Signed-off-by: Nitesh Kumar Agrawal <Nitesh-kumar.Agrawal@amd.com>
Signed-off-by: Alex Hung <alex.hung@canonical.com>
Acked-by: Stefan Bader <stefan.bader@caonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@caonical.com>

drivers/pinctrl/pinctrl-amd.c

@@ -48,16 +48,6 @@ static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 
 	spin_lock_irqsave(&gpio_dev->lock, flags);
 	pin_reg = readl(gpio_dev->base + offset * 4);
-	/*
-	 * Suppose BIOS or Bootloader sets specific debounce for the
-	 * GPIO. if not, set debounce to be  2.75ms and remove glitch.
-	*/
-	if ((pin_reg & DB_TMR_OUT_MASK) == 0) {
-		pin_reg |= 0xf;
-		pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
-		pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
-		pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
-	}
 
 	pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
 	writel(pin_reg, gpio_dev->base + offset * 4);
@@ -331,15 +321,7 @@ static void amd_gpio_irq_enable(struct irq_data *d)
 
 	spin_lock_irqsave(&gpio_dev->lock, flags);
 	pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
-	/*
-		Suppose BIOS or Bootloader sets specific debounce for the
-		GPIO. if not, set debounce to be  2.75ms.
-	*/
-	if ((pin_reg & DB_TMR_OUT_MASK) == 0) {
-		pin_reg |= 0xf;
-		pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
-		pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
-	}
+
 	pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
 	pin_reg |= BIT(INTERRUPT_MASK_OFF);
 	writel(pin_reg, gpio_dev->base + (d->hwirq)*4);