drivers: dma: dw: Add power management state check in get_status

Add power management state validation in dw_dma_get_status() to ensure
the device is in active state before attempting to read DMA status.
Returns -EINVAL if device is not active, preventing potential issues
when accessing hardware registers while device is suspended.

Signed-off-by: Adrian Bonislawski <[email protected]>

Author: abonislawski

drivers/dma/dma_dw_common.c

@@ -826,11 +826,18 @@ int dw_dma_get_status(const struct device *dev, uint32_t channel,
 	struct dw_dma_dev_data *const dev_data = dev->data;
 	const struct dw_dma_dev_cfg *const dev_cfg = dev->config;
 	struct dw_dma_chan_data *chan_data;
+	enum pm_device_state pm_state;
+	int ret;
 
 	if (channel >= DW_CHAN_COUNT) {
 		return -EINVAL;
 	}
 
+	ret = pm_device_state_get(dev, &pm_state);
+	if (!ret && pm_state != PM_DEVICE_STATE_ACTIVE) {
+		return -EINVAL;
+	}
+
 	chan_data = &dev_data->chan[channel];
 
 	if (chan_data->direction == MEMORY_TO_MEMORY ||