linux-kernel - [PATCH] dmaengine: ti: k3-udma: Report short packet errors

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Message-ID: <20240103-tr_resp_err-v1-1-2fdf6d48ab92@ti.com>
Date: Wed, 3 Jan 2024 14:37:55 +0530
From: Jai Luthra <j-luthra@...com>
To: Peter Ujfalusi <peter.ujfalusi@...il.com>, Vinod Koul <vkoul@...nel.org>,
        Grygorii Strashko <grygorii.strashko@...com>
CC: Peter Ujfalusi <peter.ujfalusi@...com>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Vignesh Raghavendra <vigneshr@...com>,
        "Jai
 Luthra" <j-luthra@...com>
Subject: [PATCH] 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: 25dcb5dd7b7c ("dmaengine: ti: New driver for K3 UDMA")
Signed-off-by: Jai Luthra <j-luthra@...com>
---
 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;
 		}
 	}
 }

---
base-commit: 610a9b8f49fbcf1100716370d3b5f6f884a2835a
change-id: 20240103-tr_resp_err-9f4eebbdcd3b

Best regards,
-- 
Jai Luthra <j-luthra@...com>