pinctrl/amd: Remove the default de-bounce time

[ Upstream commit 8cf43455 ]

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.

Cc: stable@vger.kernel.org
Reviewed-by:   Ken Xue <Ken.Xue@amd.com>
Signed-off-by: Nitesh Kumar Agrawal <Nitesh-kumar.Agrawal@amd.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

drivers/pinctrl/pinctrl-amd.c

@@ -48,17 +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);
 	spin_unlock_irqrestore(&gpio_dev->lock, flags);
@@ -331,15 +320,6 @@ 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);