The proper place for the main logic of the soft LLP mode is
dwc_scan_descriptors. It prevents to get the transfer unexpectedly aborted in
case the user calls dwc_tx_status.
Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
drivers/dma/dw_dmac.c | 43 +++++++++++++++++++++----------------------
1 file changed, 21 insertions(+), 22 deletions(-)
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 28593b7..3935ed7 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -400,6 +400,20 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct
dw_dma_chan *dwc)
if (status_xfer & dwc->mask) {
/* Everything we've submitted is done */
dma_writel(dw, CLEAR.XFER, dwc->mask);
+
+ if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
+ if (dwc->tx_node_active != dwc->tx_list) {
+ desc = to_dw_desc(dwc->tx_node_active);
+
+ /* Submit next block */
+ dwc_do_single_block(dwc, desc);
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ return;
+ }
+ /* We are done here */
+ clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
+ }
spin_unlock_irqrestore(&dwc->lock, flags);
dwc_complete_all(dw, dwc);
@@ -411,6 +425,12 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct
dw_dma_chan *dwc)
return;
}
+ if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
+ dev_vdbg(chan2dev(&dwc->chan), "%s: soft LLP mode\n", __func__);
+ spin_unlock_irqrestore(&dwc->lock, flags);
+ return;
+ }
+
dev_vdbg(chan2dev(&dwc->chan), "%s: llp=0x%llx\n", __func__,
(unsigned long long)llp);
@@ -596,29 +616,8 @@ static void dw_dma_tasklet(unsigned long data)
dwc_handle_cyclic(dw, dwc, status_err, status_xfer);
else if (status_err & (1 << i))
dwc_handle_error(dw, dwc);
- else if (status_xfer & (1 << i)) {
- unsigned long flags;
-
- spin_lock_irqsave(&dwc->lock, flags);
- if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
- if (dwc->tx_node_active != dwc->tx_list) {
- struct dw_desc *desc =
- to_dw_desc(dwc->tx_node_active);
-
- dma_writel(dw, CLEAR.XFER, dwc->mask);
-
- dwc_do_single_block(dwc, desc);
-
- spin_unlock_irqrestore(&dwc->lock,
flags);
- continue;
- }
- /* we are done here */
- clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
- }
- spin_unlock_irqrestore(&dwc->lock, flags);
-
+ else if (status_xfer & (1 << i))
dwc_scan_descriptors(dw, dwc);
- }
}
/*
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
