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authorFancy Fang <chen.fang@nxp.com>2023-05-05 09:58:39 +0300
committerThierry Reding <thierry.reding@gmail.com>2023-06-23 16:42:44 +0300
commit661dfb7f46298e53f6c3deaa772fa527aae86193 (patch)
tree362e0b1ff0cbbfa7c45ea8c3afc344bd6f70d4ea /drivers/pwm
parent329db102a26da0ba876974dbe04308d08acfad94 (diff)
downloadlinux-661dfb7f46298e53f6c3deaa772fa527aae86193.tar.xz
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 <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>
Diffstat (limited to 'drivers/pwm')
-rw-r--r--drivers/pwm/pwm-imx-tpm.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c
index 5e2b452ee5f2..98ab65c89685 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;