linux-kernel - [PATCH 4.14 55/85] pinctrl: amd: use higher precision for 512 RtcClk

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Message-Id: <20201117122113.731504088@linuxfoundation.org>
Date:   Tue, 17 Nov 2020 14:05:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Coiby Xu <coiby.xu@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.14 55/85] pinctrl: amd: use higher precision for 512 RtcClk

From: Coiby Xu <coiby.xu@...il.com>

commit c64a6a0d4a928c63e5bc3b485552a8903a506c36 upstream.

RTC is 32.768kHz thus 512 RtcClk equals 15625 usec. The documentation
likely has dropped precision and that's why the driver mistakenly took
the slightly deviated value.

Cc: stable@...r.kernel.org
Reported-by: Andy Shevchenko <andy.shevchenko@...il.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
Suggested-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Coiby Xu <coiby.xu@...il.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Link: https://lore.kernel.org/linux-gpio/2f4706a1-502f-75f0-9596-cc25b4933b6c@redhat.com/
Link: https://lore.kernel.org/r/20201105231912.69527-3-coiby.xu@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pinctrl/pinctrl-amd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -144,7 +144,7 @@ static int amd_gpio_set_debounce(struct
 			pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
 			pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
 		} else if (debounce < 250000) {
-			time = debounce / 15600;
+			time = debounce / 15625;
 			pin_reg |= time & DB_TMR_OUT_MASK;
 			pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
 			pin_reg |= BIT(DB_TMR_LARGE_OFF);