From: Billy Tsai <billy_tsai@aspeedtech.com>
To: <b.zolnierkie@samsung.com>, <jdelvare@suse.com>,
<linux@roeck-us.net>, <u.kleine-koenig@pengutronix.de>,
<linux-hwmon@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <BMC-SW@aspeedtech.com>, <stable@vger.kernel.org>
Subject: [PATCH] hwmon: (pwm-fan) Ensure the fan going on in .probe()
Date: Tue, 30 Nov 2021 17:22:12 +0800 [thread overview]
Message-ID: <20211130092212.17783-1-billy_tsai@aspeedtech.com> (raw)
Before commit 86585c61972f ("hwmon: (pwm-fan) stop using legacy
PWM functions and some cleanups") pwm_apply_state() was called
unconditionally in pwm_fan_probe(). In this commit this direct
call was replaced by a call to __set_pwm(ct, MAX_PWM) which
however is a noop if ctx->pwm_value already matches the value to
set.
After probe the fan is supposed to run at full speed, and the
internal driver state suggests it does, but this isn't asserted
and depending on bootloader and pwm low-level driver, the fan
might just be off.
So drop setting pwm_value to MAX_PWM to ensure the check in
__set_pwm doesn't make it exit early and the fan goes on as
intended.
Cc: stable@vger.kernel.org
Fixes: 86585c61972f ("hwmon: (pwm-fan) stop using legacy PWM functions and some cleanups")
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
---
drivers/hwmon/pwm-fan.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 17518b4cab1b..f12b9a28a232 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -336,8 +336,6 @@ static int pwm_fan_probe(struct platform_device *pdev)
return ret;
}
- ctx->pwm_value = MAX_PWM;
-
pwm_init_state(ctx->pwm, &ctx->pwm_state);
/*
--
2.25.1
next reply other threads:[~2021-11-30 9:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-30 9:22 Billy Tsai [this message]
2021-11-30 10:38 ` Uwe Kleine-König
2021-11-30 14:33 ` Guenter Roeck
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20211130092212.17783-1-billy_tsai@aspeedtech.com \
--to=billy_tsai@aspeedtech.com \
--cc=BMC-SW@aspeedtech.com \
--cc=b.zolnierkie@samsung.com \
--cc=jdelvare@suse.com \
--cc=linux-hwmon@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=stable@vger.kernel.org \
--cc=u.kleine-koenig@pengutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®