dmaengine Archive on lore.kernel.org
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From: Peter Ujfalusi <peter.ujfalusi@ti.com>
To: <vkoul@kernel.org>
Cc: <dan.j.williams@intel.com>, <dmaengine@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <grygorii.strashko@ti.com>,
	<t-kristo@ti.com>, <tony@atomide.com>, <vigneshr@ti.com>
Subject: [PATCH 1/3] dmaengine: ti: k3-udma: Correct completed descriptor's residue value
Date: Mon, 2 Dec 2019 22:31:26 +0200
Message-ID: <20191202203128.14348-2-peter.ujfalusi@ti.com> (raw)
In-Reply-To: <20191202203128.14348-1-peter.ujfalusi@ti.com>

The residue should show the number of _not_ completed bytes, so it has to
be 0 when the full transfer is completed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 drivers/dma/ti/k3-udma.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index c1450b0a8224..1b929f7a84d4 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -2784,13 +2784,14 @@ static void udma_desc_pre_callback(struct virt_dma_chan *vc,
 
 		if (cppi5_desc_get_type(desc_vaddr) ==
 		    CPPI5_INFO0_DESC_TYPE_VAL_HOST) {
-			result->residue = cppi5_hdesc_get_pktlen(desc_vaddr);
-			if (result->residue == d->residue)
-				result->result = DMA_TRANS_NOERROR;
-			else
+			result->residue = d->residue -
+					  cppi5_hdesc_get_pktlen(desc_vaddr);
+			if (result->residue)
 				result->result = DMA_TRANS_ABORTED;
+			else
+				result->result = DMA_TRANS_NOERROR;
 		} else {
-			result->residue = d->residue;
+			result->residue = 0;
 			result->result = DMA_TRANS_NOERROR;
 		}
 	}
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki


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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <0191128105945.13071-1-peter.ujfalusi@ti.com>
2019-12-02 20:31 ` [PATCH 0/3] dmaengine: ti: k3-udma: Fixes against v6 series Peter Ujfalusi
2019-12-02 20:31   ` Peter Ujfalusi [this message]
2019-12-02 20:31   ` [PATCH 2/3] dmaengine: ti: k3-udma: Workaround for stale transfers Peter Ujfalusi
2019-12-02 20:31   ` [PATCH 3/3] dmaengine: ti: k3-udma: Fix early TX completion against PDMAs Peter Ujfalusi

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