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| author | Tudor Ambarus <tudor.ambarus@microchip.com> | 2021-12-15 13:01:04 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-01-05 15:50:03 +0530 |
| commit | bccfb96b59179d4f96cbbd1ddff8fac6d335eae4 (patch) | |
| tree | 3a591445ae5008d90869d22797c07863878dd68a /drivers/dma/at_xdmac.c | |
| parent | fde212e44f45e491f8e3875084b587c0c2189078 (diff) | |
| download | linux-rpi-bccfb96b59179d4f96cbbd1ddff8fac6d335eae4.tar.gz linux-rpi-bccfb96b59179d4f96cbbd1ddff8fac6d335eae4.tar.bz2 linux-rpi-bccfb96b59179d4f96cbbd1ddff8fac6d335eae4.zip | |
dmaengine: at_xdmac: Don't start transactions at tx_submit level
tx_submit is supposed to push the current transaction descriptor to a
pending queue, waiting for issue_pending() to be called. issue_pending()
must start the transfer, not tx_submit(), thus remove
at_xdmac_start_xfer() from at_xdmac_tx_submit(). Clients of at_xdmac that
assume that tx_submit() starts the transfer must be updated and call
dma_async_issue_pending() if they miss to call it (one example is
atmel_serial).
As the at_xdmac_start_xfer() is now called only from
at_xdmac_advance_work() when !at_xdmac_chan_is_enabled(), the
at_xdmac_chan_is_enabled() check is no longer needed in
at_xdmac_start_xfer(), thus remove it.
Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20211215110115.191749-2-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/at_xdmac.c')
| -rw-r--r-- | drivers/dma/at_xdmac.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index e42dede5b243..4ff12b083136 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -385,9 +385,6 @@ static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan, dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, first); - if (at_xdmac_chan_is_enabled(atchan)) - return; - /* Set transfer as active to not try to start it again. */ first->active_xfer = true; @@ -479,9 +476,6 @@ static dma_cookie_t at_xdmac_tx_submit(struct dma_async_tx_descriptor *tx) dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n", __func__, atchan, desc); list_add_tail(&desc->xfer_node, &atchan->xfers_list); - if (list_is_singular(&atchan->xfers_list)) - at_xdmac_start_xfer(atchan, desc); - spin_unlock_irqrestore(&atchan->lock, irqflags); return cookie; } |