[PATCH v1 1/2] at_hdmac: check and return DMA_PAUSED status when suitable

Andy Shevchenko
2022-11-08T07:49:28Z

device_tx_status() may return DMA_PAUSED status when driver supports it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/dma/at_hdmac.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 8858470246e1..a9d8dd990d6e 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1669,9 +1669,19 @@ atc_tx_status(struct dma_chan *chan,
int ret;

dma_status = dma_cookie_status(chan, cookie, txstate);
- if (dma_status == DMA_COMPLETE || !txstate)
+ if (dma_status == DMA_COMPLETE)
return dma_status;

+ /*
+ * There's no point in calculating the residue if there's
+ * no txstate to store the value.
+ */
+ if (!txstate) {
+ if (test_bit(ATC_IS_PAUSED, &atchan->status))
+ return DMA_PAUSED;
+ return DMA_ERROR;
+ }
+
spin_lock_irqsave(&atchan->vc.lock, flags);
/* Get number of bytes left in the active transactions */
ret = atc_get_residue(chan, cookie, &residue);
@@ -1684,6 +1694,9 @@ atc_tx_status(struct dma_chan *chan,
dma_set_residue(txstate, residue);
}

+ if (test_bit(ATC_IS_PAUSED, &atchan->status))
+ dma_status = DMA_PAUSED;
+
dev_vdbg(chan2dev(chan), "tx_status %d: cookie = %d residue = %u\n",
dma_status, cookie, residue);

--
2.35.1