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dmaengine: ti: k3-udma: Report short packet errors 

Propagate the TR response status to the device using BCDMA
split-channels. For example CSI-RX driver should be able to check if a
frame was not transferred completely (short packet) and needs to be
discarded.

Fixes: 25dcb5dd7b ("dmaengine: ti: New driver for K3 UDMA")
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20240103-tr_resp_err-v1-1-2fdf6d48ab92@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Jai Luthra 2024-01-03 14:37:55 +05:30 committed by Vinod Koul
parent 6e2276203a
commit bc9847c9ba
1 changed files with 8 additions and 2 deletions
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10
drivers/dma/ti/k3-udma.c
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@ -3968,6 +3968,7 @@ static void udma_desc_pre_callback(struct virt_dma_chan *vc,
{
struct udma_chan *uc = to_udma_chan(&vc->chan);
struct udma_desc *d;
u8 status;
if (!vd)
return;
@ -3977,12 +3978,12 @@ static void udma_desc_pre_callback(struct virt_dma_chan *vc,
if (d->metadata_size)
udma_fetch_epib(uc, d);
/* Provide residue information for the client */
if (result) {
void *desc_vaddr = udma_curr_cppi5_desc_vaddr(d, d->desc_idx);
if (cppi5_desc_get_type(desc_vaddr) ==
CPPI5_INFO0_DESC_TYPE_VAL_HOST) {
/* Provide residue information for the client */
result->residue = d->residue -
cppi5_hdesc_get_pktlen(desc_vaddr);
if (result->residue)
@ -3991,7 +3992,12 @@ static void udma_desc_pre_callback(struct virt_dma_chan *vc,
result->result = DMA_TRANS_NOERROR;
} else {
result->residue = 0;
result->result = DMA_TRANS_NOERROR;
/* Propagate TR Response errors to the client */
status = d->hwdesc[0].tr_resp_base->status;
if (status)
result->result = DMA_TRANS_ABORTED;
else
result->result = DMA_TRANS_NOERROR;
}
}
}