iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

iio: trigger: stm32-timer: disable master mode when stopping

Browse Source 
commit 29e8c8253d7d5265f58122c0a7902e26df6c6f61 upstream.

Master mode should be disabled when stopping. This mainly impacts
possible other use-case after timer has been stopped. Currently,
master mode remains set (from start routine).

Fixes: 6fb34812c2a2 ("iio: stm32 trigger: Add support for TRGO2 triggers")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fabrice Gasnier 2020-02-14 17:46:35 +01:00 committed by Greg Kroah-Hartman
parent 59dfa43ef5
commit 5d777b76b2
1 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/iio/trigger/stm32-timer-trigger.c
View File

@ -161,7 +161,8 @@ static int stm32_timer_start(struct stm32_timer_trigger *priv,
return 0;
}
static void stm32_timer_stop(struct stm32_timer_trigger *priv)
static void stm32_timer_stop(struct stm32_timer_trigger *priv,
struct iio_trigger *trig)
{
u32 ccer, cr1;
@ -179,6 +180,12 @@ static void stm32_timer_stop(struct stm32_timer_trigger *priv)
regmap_write(priv->regmap, TIM_PSC, 0);
regmap_write(priv->regmap, TIM_ARR, 0);
/* Force disable master mode */
if (stm32_timer_is_trgo2_name(trig->name))
regmap_update_bits(priv->regmap, TIM_CR2, TIM_CR2_MMS2, 0);
else
regmap_update_bits(priv->regmap, TIM_CR2, TIM_CR2_MMS, 0);
/* Make sure that registers are updated */
regmap_update_bits(priv->regmap, TIM_EGR, TIM_EGR_UG, TIM_EGR_UG);
}
@ -197,7 +204,7 @@ static ssize_t stm32_tt_store_frequency(struct device *dev,
return ret;
if (freq == 0) {
stm32_timer_stop(priv);
stm32_timer_stop(priv, trig);
} else {
ret = stm32_timer_start(priv, trig, freq);
if (ret)