From: Fancy Fang Date: Fri, 5 May 2023 06:58:39 +0000 (+0800) Subject: pwm: imx-tpm: force 'real_period' to be zero in suspend X-Git-Tag: v6.6.7~2418^2~9 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=661dfb7f46298e53f6c3deaa772fa527aae86193;p=platform%2Fkernel%2Flinux-starfive.git pwm: imx-tpm: force 'real_period' to be zero in suspend 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 Signed-off-by: Clark Wang Acked-by: Uwe Kleine-König Fixes: 738a1cfec2ed ("pwm: Add i.MX TPM PWM driver support") Signed-off-by: Thierry Reding --- diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c index 5e2b452..98ab65c 100644 --- a/drivers/pwm/pwm-imx-tpm.c +++ b/drivers/pwm/pwm-imx-tpm.c @@ -397,6 +397,13 @@ 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;