[PATCH v3 05/12] gpio: rockchip: fix debounce calculate

[Ye Zhang]

The previous configuration ensured that signals with a duration greater
than the debounce value would always be detected, while signals with a
duration less than debounce / 2 would always not be detected. After the
modification, it is changed to ensure that signals with a duration greater
than 2 * debounce will always be detected, while signals with a duration
less than debounce/2 will still not be detected.

Fixes: 3bcbd1a85b68 ("gpio/rockchip: support next version gpio controller")
Signed-off-by: Ye Zhang <ye.zhang at rock-chips.com>
---
 drivers/gpio/gpio-rockchip.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 26191197cd37..75355f799751 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -213,13 +213,13 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 		freq = clk_get_rate(bank->db_clk);
 		if (!freq)
 			return -EINVAL;
-		div = (u64)(GENMASK(23, 0) + 1) * 2 * HZ_PER_MHZ;
+		div = (u64)(GENMASK(23, 0) + 1) * HZ_PER_MHZ;
 		max_debounce = DIV_ROUND_CLOSEST_ULL(div, freq);
 		if (debounce > max_debounce)
 			return -EINVAL;
 
 		div = (u64)debounce * freq;
-		div_reg = DIV_ROUND_CLOSEST_ULL(div, 2 * USEC_PER_SEC) - 1;
+		div_reg = DIV_ROUND_CLOSEST_ULL(div, USEC_PER_SEC) - 1;
 	}
 
 	raw_spin_lock_irqsave(&bank->slock, flags);
-- 
2.34.1