Writing to ecap register on second insmod crashes with an external abort. This happens becuase the STOP_CLK bit remains set(from rmmod) during the second insmod thereby not allowing the clocks to get enabled.
So, we disable STOP clock bit while doing a clock enable. Signed-off-by: Sourav Poddar <[email protected]> --- drivers/pwm/pwm-tipwmss.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/pwm/pwm-tipwmss.c b/drivers/pwm/pwm-tipwmss.c index 3b119bc..4749866 100644 --- a/drivers/pwm/pwm-tipwmss.c +++ b/drivers/pwm/pwm-tipwmss.c @@ -40,6 +40,8 @@ u16 pwmss_submodule_state_change(struct device *dev, int set) mutex_lock(&info->pwmss_lock); val = readw(info->mmio_base + PWMSS_CLKCONFIG); + if (set == PWMSS_ECAPCLK_EN) + val &= ~PWMSS_ECAPCLK_STOP_REQ; val |= set; writew(val , info->mmio_base + PWMSS_CLKCONFIG); mutex_unlock(&info->pwmss_lock); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-pwm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
