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

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[ 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: 738a1cfec2ed ("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>
This commit is contained in:
Fancy Fang 2023-05-05 14:58:39 +08:00 committed by Greg Kroah-Hartman
parent d252c74b8b
commit 5375c024f8
1 changed files with 7 additions and 0 deletions
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7
drivers/pwm/pwm-imx-tpm.c
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@ -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;