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[5.6,011/167] pwm: imx27: Fix clock handling in pwm_imx27_apply()

Message ID 20200428182226.639247102@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH April 28, 2020, 6:23 p.m. UTC 
From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

[ Upstream commit 15d4dbd601591858611184f9ddeb5bf21569159c ]

pwm_imx27_apply() enables the clocks if the previous PWM state was
disabled. Given that the clocks are supposed to be left on iff the PWM
is running, the decision to disable the clocks at the end of the
function must not depend on the previous state.

Without this fix the enable count of the two affected clocks increases
by one whenever ->apply() changes from one disabled state to another.

Fixes: bd88d319abe9 ("pwm: imx27: Unconditionally write state to hardware")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pwm/pwm-imx27.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c
index 35a7ac42269c2..7e5ed01529773 100644
--- a/drivers/pwm/pwm-imx27.c
+++ b/drivers/pwm/pwm-imx27.c
@@ -289,7 +289,7 @@  static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	writel(cr, imx->mmio_base + MX3_PWMCR);
 
-	if (!state->enabled && cstate.enabled)
+	if (!state->enabled)
 		pwm_imx27_clk_disable_unprepare(chip);
 
 	return 0;