pwm: tiehrpwm: Don't use emulation mode bits to control PWM output

As per AM335x TRM SPRUH73P "15.2.2.11 ePWM Behavior During Emulation",
TBCTL[15:14] only have effect during emulation suspend events (IOW,
to stop PWM when debugging using a debugger). These bits have no effect
on PWM output during normal running of system. Hence, remove code
accessing these bits as they have no role in enabling/disabling PWMs.

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>

1 files changed, 1 insertions, 11 deletions

diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 4c22cb395040..768176f54d5e 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -33,10 +33,6 @@
 #define TBCTL                   0x00
 #define TBPRD                   0x0A
 
-#define TBCTL_RUN_MASK          (BIT(15) | BIT(14))
-#define TBCTL_STOP_NEXT         0
-#define TBCTL_STOP_ON_CYCLE     BIT(14)
-#define TBCTL_FREE_RUN          (BIT(15) | BIT(14))
 #define TBCTL_PRDLD_MASK        BIT(3)
 #define TBCTL_PRDLD_SHDW        0
 #define TBCTL_PRDLD_IMDT        BIT(3)
@@ -360,7 +356,7 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
         /* Channels polarity can be configured from action qualifier module */
         configure_polarity(pc, pwm->hwpwm);
 
-        /* Enable TBCLK before enabling PWM device */
+        /* Enable TBCLK */
         ret = clk_enable(pc->tbclk);
         if (ret) {
                 dev_err(chip->dev, "Failed to enable TBCLK for %s: %d\n",
@@ -368,9 +364,6 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
                 return ret;
         }
 
-        /* Enable time counter for free_run */
-        ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_FREE_RUN);
-
         return 0;
 }
 
@@ -400,9 +393,6 @@ static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
         /* Disabling TBCLK on PWM disable */
         clk_disable(pc->tbclk);
 
-        /* Stop Time base counter */
-        ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_STOP_NEXT);
-
         /* Disable clock on PWM disable */
         pm_runtime_put_sync(chip->dev);
 }