diff options
Diffstat (limited to 'drivers/mfd/ti_am335x_tscadc.c')
| -rw-r--r-- | drivers/mfd/ti_am335x_tscadc.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index 467c80e1c4ae..e4e4b22eebc9 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -68,12 +68,6 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) DEFINE_WAIT(wait); u32 reg; - /* - * disable TSC steps so it does not run while the ADC is using it. If - * write 0 while it is running (it just started or was already running) - * then it completes all steps that were enabled and stops then. - */ - tscadc_writel(tsadc, REG_SE, 0); reg = tscadc_readl(tsadc, REG_ADCFSM); if (reg & SEQ_STATUS) { tsadc->adc_waiting = true; @@ -86,8 +80,12 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) spin_lock_irq(&tsadc->reg_lock); finish_wait(&tsadc->reg_se_wait, &wait); + /* + * Sequencer should either be idle or + * busy applying the charge step. + */ reg = tscadc_readl(tsadc, REG_ADCFSM); - WARN_ON(reg & SEQ_STATUS); + WARN_ON((reg & SEQ_STATUS) && !(reg & CHARGE_STEP)); tsadc->adc_waiting = false; } tsadc->adc_in_use = true; @@ -96,7 +94,6 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val) { spin_lock_irq(&tsadc->reg_lock); - tsadc->reg_se_cache |= val; am335x_tscadc_need_adc(tsadc); tscadc_writel(tsadc, REG_SE, val); |