dmaengine: mmp_tdma: Log an error if channel is in wrong state

Let's log an error if the channel can't be prepared because it is in an
unexpected state.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200419164912.670973-6-lkundrak@v3.sk
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c
index fa00665efd9d87e530fa630d360d882a126f2b95..1597f6ebf3357908243a79c4366a006b11534279 100644 (file)
--- a/drivers/dma/mmp_tdma.c
+++ b/drivers/dma/mmp_tdma.c
@@ -427,8 +427,10 @@ static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
        int num_periods = buf_len / period_len;
        int i = 0, buf = 0;
 
-       if (tdmac->status != DMA_COMPLETE)
+       if (tdmac->status != DMA_COMPLETE) {
+               dev_err(tdmac->dev, "controller busy");
                return NULL;
+       }
 
        if (period_len > TDMA_MAX_XFER_BYTES) {
                dev_err(tdmac->dev,