From: Vignesh R <vigneshr@ti.com> To: Thierry Reding <thierry.reding@gmail.com> Cc: <linux-pwm@vger.kernel.org>, <linux-omap@vger.kernel.org>, <linux-kernel@vger.kernel.org>, Vignesh R <vigneshr@ti.com> Subject: [PATCH 2/2] pwm: pwm-tiehrpwm: Fix disabling of output of PWMs Date: Mon, 11 Jun 2018 11:39:56 +0530 [thread overview] Message-ID: <20180611060956.27999-3-vigneshr@ti.com> (raw) In-Reply-To: <20180611060956.27999-1-vigneshr@ti.com> 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> --- drivers/pwm/pwm-tiehrpwm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c index 768176f54d5e..f7b8a86fa5c5 100644 --- a/drivers/pwm/pwm-tiehrpwm.c +++ b/drivers/pwm/pwm-tiehrpwm.c @@ -381,6 +381,8 @@ 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 -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Vignesh R <vigneshr@ti.com> To: Thierry Reding <thierry.reding@gmail.com> Cc: linux-pwm@vger.kernel.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, Vignesh R <vigneshr@ti.com> Subject: [PATCH 2/2] pwm: pwm-tiehrpwm: Fix disabling of output of PWMs Date: Mon, 11 Jun 2018 11:39:56 +0530 [thread overview] Message-ID: <20180611060956.27999-3-vigneshr@ti.com> (raw) In-Reply-To: <20180611060956.27999-1-vigneshr@ti.com> 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> --- drivers/pwm/pwm-tiehrpwm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c index 768176f54d5e..f7b8a86fa5c5 100644 --- a/drivers/pwm/pwm-tiehrpwm.c +++ b/drivers/pwm/pwm-tiehrpwm.c @@ -381,6 +381,8 @@ 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 -- 2.17.1
next prev parent reply other threads:[~2018-06-11 6:09 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-06-11 6:09 [PATCH 0/2] pwm-tiehrpwm: fixes for disabling PWMs Vignesh R 2018-06-11 6:09 ` Vignesh R 2018-06-11 6:09 ` [PATCH 1/2] pwm: pwm-tiehrpwm: Don't use emulation mode bits to control PWM output Vignesh R 2018-06-11 6:09 ` Vignesh R 2018-06-11 6:09 ` Vignesh R [this message] 2018-06-11 6:09 ` [PATCH 2/2] pwm: pwm-tiehrpwm: Fix disabling of output of PWMs Vignesh R 2018-07-09 16:58 ` [PATCH 0/2] pwm-tiehrpwm: fixes for disabling PWMs Thierry Reding
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