linux-kernel - [PATCH 5.10 421/717] dmaengine: ti: k3-udma: Correct normal channel offset when uchan

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Date:   Mon, 28 Dec 2020 13:46:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Ujfalusi <peter.ujfalusi@...com>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 421/717] dmaengine: ti: k3-udma: Correct normal channel offset when uchan_cnt is not 0

From: Peter Ujfalusi <peter.ujfalusi@...com>

[ Upstream commit e2de925bbfe321ba0588c99f577c59386ab1f428 ]

According to different sections of the TRM, the hchan_cnt of CAP3 includes
the number of uchan in UDMA, thus the start offset of the normal channels
are hchan_cnt.

Fixes: daf4ad0499aa4 ("dmaengine: ti: k3-udma: Query throughput level information from hardware")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Link: https://lore.kernel.org/r/20201208090440.31792-2-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/ti/k3-udma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 82cf6c77f5c93..d3902784cae24 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -3201,8 +3201,7 @@ static int udma_setup_resources(struct udma_dev *ud)
 	} else if (UDMA_CAP3_UCHAN_CNT(cap3)) {
 		ud->tpl_levels = 3;
 		ud->tpl_start_idx[1] = UDMA_CAP3_UCHAN_CNT(cap3);
-		ud->tpl_start_idx[0] = ud->tpl_start_idx[1] +
-				       UDMA_CAP3_HCHAN_CNT(cap3);
+		ud->tpl_start_idx[0] = UDMA_CAP3_HCHAN_CNT(cap3);
 	} else if (UDMA_CAP3_HCHAN_CNT(cap3)) {
 		ud->tpl_levels = 2;
 		ud->tpl_start_idx[0] = UDMA_CAP3_HCHAN_CNT(cap3);
-- 
2.27.0