diff options
| author | Fancy Fang <chen.fang@nxp.com> | 2023-05-05 09:58:39 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-27 09:44:07 +0300 |
| commit | 8a0413be8a1e352d15b8634e0551c3111a4f919f (patch) | |
| tree | c9da87bc31ad60bf81ddec70fd86f45622dce27b | |
| parent | e4845cdea71e280de71946577e7a47ba48dc84af (diff) | |
| download | linux-8a0413be8a1e352d15b8634e0551c3111a4f919f.tar.xz | |
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: 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>
| -rw-r--r-- | drivers/pwm/pwm-imx-tpm.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c index fcdf6befb838..871527b78aa4 100644 --- a/drivers/pwm/pwm-imx-tpm.c +++ b/drivers/pwm/pwm-imx-tpm.c @@ -403,6 +403,13 @@ 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; |