Patch "pwm: meson: modify and simplify calculation in meson_pwm_get_state" has been added to the 6.1-stable tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This is a note to let you know that I've just added the patch titled

    pwm: meson: modify and simplify calculation in meson_pwm_get_state

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pwm-meson-modify-and-simplify-calculation-in-meson_pwm_get_state.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 6b9352f3f8a1a35faf0efc1ad1807ee303467796 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Date: Wed, 24 May 2023 21:47:43 +0200
Subject: pwm: meson: modify and simplify calculation in meson_pwm_get_state
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Heiner Kallweit <hkallweit1@xxxxxxxxx>

commit 6b9352f3f8a1a35faf0efc1ad1807ee303467796 upstream.

I don't see a reason why we should treat the case lo < hi differently
and return 0 as period and duty_cycle. The current logic was added with
c375bcbaabdb ("pwm: meson: Read the full hardware state in
meson_pwm_get_state()"), Martin as original author doesn't remember why
it was implemented this way back then.
So let's handle it as normal use case and also remove the optimization
for lo == 0. I think the improved readability is worth it.

Fixes: c375bcbaabdb ("pwm: meson: Read the full hardware state in meson_pwm_get_state()")
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Reviewed-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx>
Acked-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pwm/pwm-meson.c |   14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -351,18 +351,8 @@ static int meson_pwm_get_state(struct pw
 	channel->lo = FIELD_GET(PWM_LOW_MASK, value);
 	channel->hi = FIELD_GET(PWM_HIGH_MASK, value);
 
-	if (channel->lo == 0) {
-		state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->hi);
-		state->duty_cycle = state->period;
-	} else if (channel->lo >= channel->hi) {
-		state->period = meson_pwm_cnt_to_ns(chip, pwm,
-						    channel->lo + channel->hi);
-		state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm,
-							channel->hi);
-	} else {
-		state->period = 0;
-		state->duty_cycle = 0;
-	}
+	state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->lo + channel->hi);
+	state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, channel->hi);
 
 	state->polarity = PWM_POLARITY_NORMAL;
 


Patches currently in stable-queue which might be from hkallweit1@xxxxxxxxx are

queue-6.1/pwm-meson-modify-and-simplify-calculation-in-meson_pwm_get_state.patch
queue-6.1/pwm-meson-fix-handling-of-period-duty-if-greater-than-uint_max.patch



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux