summaryrefslogtreecommitdiff
path: root/drivers/pwm
diff options
context:
space:
mode:
authorVignesh R <vigneshr@ti.com>2018-06-11 11:39:56 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-09 20:04:35 +0200
commit57d78f3e00b9877cdeea6b44a6f0c070e7b0d3a7 (patch)
tree63ec97d60f18a33017084d424cec0caa07e7bfd4 /drivers/pwm
parentdfd7543a6734b982b007734826add041158618ef (diff)
pwm: tiehrpwm: Fix disabling of output of PWMs
commit 38dabd91ff0bde33352ca3cc65ef515599b77a05 upstream. pwm-tiehrpwm driver disables PWM output by putting it in low output state via active AQCSFRC register in ehrpwm_pwm_disable(). But, the AQCSFRC shadow register is not updated. Therefore, when shadow AQCSFRC register is re-enabled in ehrpwm_pwm_enable() (say to enable second PWM output), previous settings are lost as shadow register value is loaded into active register. This results in things like PWMA getting enabled automatically, when PWMB is enabled and vice versa. Fix this by updating AQCSFRC shadow register as well during ehrpwm_pwm_disable(). Fixes: 19891b20e7c2 ("pwm: pwm-tiehrpwm: PWM driver support for EHRPWM") Cc: stable@vger.kernel.org Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/pwm')
-rw-r--r--drivers/pwm/pwm-tiehrpwm.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 6a41e66015b6..062dff1c902d 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -384,6 +384,8 @@ static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
aqcsfrc_mask = AQCSFRC_CSFA_MASK;
}
+ /* Update shadow register first before modifying active register */
+ ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
/*
* Changes to immediate action on Action Qualifier. This puts
* Action Qualifier control on PWM output from next TBCLK