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dmaengine: ti: omap-dma: Improved memcpy polling support 

When a DMA client driver does not set the DMA_PREP_INTERRUPT because it
does not want to use interrupts for DMA completion or because it can not
rely on DMA interrupts due to executing the memcpy when interrupts are
disabled it will poll the status of the transfer.

If the interrupts are enabled then the cookie will be set completed in the
interrupt handler so only check in HW completion when the polling is really
needed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20190716082459.1222-3-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Peter Ujfalusi 2019-07-16 11:24:59 +03:00 committed by Vinod Koul
parent aac8670369
commit 4689d35c76
1 changed files with 28 additions and 16 deletions
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44
drivers/dma/ti/omap-dma.c
View File

@ -91,6 +91,7 @@ struct omap_desc {
bool using_ll;
enum dma_transfer_direction dir;
dma_addr_t dev_addr;
bool polled;
int32_t fi; /* for OMAP_DMA_SYNC_PACKET / double indexing */
int16_t ei; /* for double indexing */
@ -816,26 +817,20 @@ static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
struct virt_dma_desc *vd;
enum dma_status ret;
unsigned long flags;
struct omap_desc *d = NULL;
ret = dma_cookie_status(chan, cookie, txstate);
if (!c->paused && c->running) {
uint32_t ccr = omap_dma_chan_read(c, CCR);
/*
* The channel is no longer active, set the return value
* accordingly
*/
if (!(ccr & CCR_ENABLE))
ret = DMA_COMPLETE;
}
if (ret == DMA_COMPLETE || !txstate)
if (ret == DMA_COMPLETE)
return ret;
spin_lock_irqsave(&c->vc.lock, flags);
if (c->desc && c->desc->vd.tx.cookie == cookie)
d = c->desc;
if (c->desc && c->desc->vd.tx.cookie == cookie) {
struct omap_desc *d = c->desc;
if (!txstate)
goto out;
if (d) {
dma_addr_t pos;
if (d->dir == DMA_MEM_TO_DEV)
@ -852,8 +847,22 @@ static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
txstate->residue = 0;
}
if (ret == DMA_IN_PROGRESS && c->paused)
out:
if (ret == DMA_IN_PROGRESS && c->paused) {
ret = DMA_PAUSED;
} else if (d && d->polled && c->running) {
uint32_t ccr = omap_dma_chan_read(c, CCR);
/*
* The channel is no longer active, set the return value
* accordingly and mark it as completed
*/
if (!(ccr & CCR_ENABLE)) {
struct omap_desc *d = c->desc;
ret = DMA_COMPLETE;
omap_dma_start_desc(c);
vchan_cookie_complete(&d->vd);
}
}
spin_unlock_irqrestore(&c->vc.lock, flags);
@ -1181,7 +1190,10 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_memcpy(
d->ccr = c->ccr;
d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_POSTINC;
d->cicr = CICR_DROP_IE | CICR_FRAME_IE;
if (tx_flags & DMA_PREP_INTERRUPT)
d->cicr |= CICR_FRAME_IE;
else
d->polled = true;
d->csdp = data_type;