[PATCH 4.9 55/95] pwm: rcar: Fix a condition to prevent mismatch value setting to duty

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ryo Kodama <ryo.kodama.vz@renesas.com>

commit 6225f9c64b40bc8a22503e9cda70f55d7a9dd3c6 upstream.

This patch fixes an issue that is possible to set mismatch value to duty
for R-Car PWM if we input the following commands:

 # cd /sys/class/pwm/<pwmchip>/
 # echo 0 > export
 # cd pwm0
 # echo 30 > period
 # echo 30 > duty_cycle
 # echo 0 > duty_cycle
 # cat duty_cycle
 0
 # echo 1 > enable
 --> Then, the actual duty_cycle is 30, not 0.

So, this patch adds a condition into rcar_pwm_config() to fix this
issue.

Signed-off-by: Ryo Kodama <ryo.kodama.vz@renesas.com>
[shimoda: revise the commit log and add Fixes and Cc tags]
Fixes: ed6c1476bf7f ("pwm: Add support for R-Car PWM Timer")
Cc: Cc: <stable@vger.kernel.org> # v4.4+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pwm/pwm-rcar.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/pwm/pwm-rcar.c
+++ b/drivers/pwm/pwm-rcar.c
@@ -156,8 +156,12 @@ static int rcar_pwm_config(struct pwm_ch
 	if (div < 0)
 		return div;
 
-	/* Let the core driver set pwm->period if disabled and duty_ns == 0 */
-	if (!pwm_is_enabled(pwm) && !duty_ns)
+	/*
+	 * Let the core driver set pwm->period if disabled and duty_ns == 0.
+	 * But, this driver should prevent to set the new duty_ns if current
+	 * duty_cycle is not set
+	 */
+	if (!pwm_is_enabled(pwm) && !duty_ns && !pwm->state.duty_cycle)
 		return 0;
 
 	rcar_pwm_update(rp, RCAR_PWMCR_SYNC, RCAR_PWMCR_SYNC, RCAR_PWMCR);