linux-kernel - [PATCH] hwmon: (aspeed-pwm-tacho) Using falling edge.

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Date:   Thu, 24 Jun 2021 11:58:21 +0800
From:   Billy Tsai <billy_tsai@...eedtech.com>
To:     <jdelvare@...e.com>, <linux@...ck-us.net>, <joel@....id.au>,
        <andrew@...id.au>, <linux-hwmon@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
CC:     <BMC-SW@...eedtech.com>
Subject: [PATCH] hwmon: (aspeed-pwm-tacho) Using falling edge.

The tach shouldn't use both edges to measure. When the tach input
duty cycle isn't 50% the return value will inaccurate.

Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
---
 drivers/hwmon/aspeed-pwm-tacho.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/aspeed-pwm-tacho.c b/drivers/hwmon/aspeed-pwm-tacho.c
index 3d8239fd66ed..0a70a0e22acf 100644
--- a/drivers/hwmon/aspeed-pwm-tacho.c
+++ b/drivers/hwmon/aspeed-pwm-tacho.c
@@ -158,7 +158,7 @@
  * 10: both
  * 11: reserved.
  */
-#define M_TACH_MODE 0x02 /* 10b */
+#define M_TACH_MODE 0x00 /* 10b */
 #define M_TACH_UNIT 0x0210
 #define INIT_FAN_CTRL 0xFF
 
-- 
2.25.1