6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jai Luthra j-luthra@ti.com
[ Upstream commit bc9847c9ba134cfe3398011e343dcf6588c1c902 ]
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: 25dcb5dd7b7c ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/ti/k3-udma.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c index 30fd2f386f36..037f1408e798 100644 --- a/drivers/dma/ti/k3-udma.c +++ b/drivers/dma/ti/k3-udma.c @@ -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; } } }