pwm: sifive: Reduce time the controller lock is held

stable inclusion
from stable-v5.10.173
commit 8b98e7a45e6382b75cacf7932bcdb27482a56e49
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8BFR3

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8b98e7a45e6382b75cacf7932bcdb27482a56e49



--------------------------------

[ Upstream commit 0f02f491 ]

The lock is only to serialize access and update to user_count and
approx_period between different PWMs served by the same pwm_chip.
So the lock needs only to be taken during the check if the (chip global)
period can and/or needs to be changed.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Stable-dep-of: 334c7b13 ("pwm: sifive: Always let the first pwm_apply_state succeed")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>