Commit 5375c024 authored May 05, 2023 by Fancy Fang Committed by Greg Kroah-Hartman Jul 27, 2023

pwm: imx-tpm: force 'real_period' to be zero in suspend



[ Upstream commit 661dfb7f46298e53f6c3deaa772fa527aae86193 ]

During suspend, all the tpm registers will lose values.
So the 'real_period' value of struct 'imx_tpm_pwm_chip'
should be forced to be zero to force the period update
code can be executed after system resume back.

Signed-off-by: Fancy Fang <chen.fang@nxp.com>
Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Fixes: 738a1cfe ("pwm: Add i.MX TPM PWM driver support")
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent d252c74b

drivers/pwm/pwm-imx-tpm.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -405,6 +405,13 @@ static int __maybe_unused pwm_imx_tpm_suspend(struct device *dev)
		if (tpm->enable_count > 0)
		return -EBUSY;

		/*
		* Force 'real_period' to be zero to force period update code
		* can be executed after system resume back, since suspend causes
		* the period related registers to become their reset values.
		*/
		tpm->real_period = 0;

		clk_disable_unprepare(tpm->clk);

		return 0;