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drivers: adc: stm32: prevent suspend to ram while measure in progress

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Prevents the system to go in Suspend to RAM low power mode while ADC
measurement is in progress.

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
This commit is contained in:
Guillaume Gautier 2023-12-15 09:07:30 +01:00 • committed by Carles Cufí
commit 276fc569d6
1 changed files with 15 additions and 1 deletions
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16
drivers/adc/adc_stm32.c
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@ -676,7 +676,7 @@ static void adc_stm32_oversampling_ratioshift(ADC_TypeDef *adc, uint32_t ratio,
} }
/* /*
* Function to configure the oversampling ratio and shit using stm32 LL * Function to configure the oversampling ratio and shift using stm32 LL
* ratio is directly the sequence->oversampling (a 2^n value) * ratio is directly the sequence->oversampling (a 2^n value)
* shift is the corresponding LL_ADC_OVS_SHIFT_RIGHT_x constant * shift is the corresponding LL_ADC_OVS_SHIFT_RIGHT_x constant
*/ */
@ -760,6 +760,10 @@ static void dma_callback(const struct device *dev, void *user_data,
adc_context_on_sampling_done(&data->ctx, dev); adc_context_on_sampling_done(&data->ctx, dev);
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE,
PM_ALL_SUBSTATES); PM_ALL_SUBSTATES);
if (IS_ENABLED(CONFIG_PM_S2RAM)) {
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_RAM,
PM_ALL_SUBSTATES);
}
} else if (status < 0) { } else if (status < 0) {
LOG_ERR("DMA sampling complete, but DMA reported error %d", status); LOG_ERR("DMA sampling complete, but DMA reported error %d", status);
data->dma_error = status; data->dma_error = status;
@ -1062,6 +1066,10 @@ static void adc_stm32_isr(const struct device *dev)
adc_context_on_sampling_done(&data->ctx, dev); adc_context_on_sampling_done(&data->ctx, dev);
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE,
PM_ALL_SUBSTATES); PM_ALL_SUBSTATES);
if (IS_ENABLED(CONFIG_PM_S2RAM)) {
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_RAM,
PM_ALL_SUBSTATES);
}
} }
} }
@ -1098,6 +1106,9 @@ static int adc_stm32_read(const struct device *dev,
adc_context_lock(&data->ctx, false, NULL); adc_context_lock(&data->ctx, false, NULL);
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES); pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
if (IS_ENABLED(CONFIG_PM_S2RAM)) {
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES);
}
error = start_read(dev, sequence); error = start_read(dev, sequence);
adc_context_release(&data->ctx, error); adc_context_release(&data->ctx, error);
@ -1114,6 +1125,9 @@ static int adc_stm32_read_async(const struct device *dev,
adc_context_lock(&data->ctx, true, async); adc_context_lock(&data->ctx, true, async);
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES); pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
if (IS_ENABLED(CONFIG_PM_S2RAM)) {
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES);
}
error = start_read(dev, sequence); error = start_read(dev, sequence);
adc_context_release(&data->ctx, error); adc_context_release(&data->ctx, error);