linux-kernel - [PATCH v2] dmaengine: ti: k3-udma: Fix BCHAN count with UHC and HC channels

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Date: Fri, 7 Jun 2024 23:41:03 +0530
From: Jai Luthra <j-luthra@...com>
To: Peter Ujfalusi <peter.ujfalusi@...il.com>, Vinod Koul <vkoul@...nel.org>
CC: <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Devarsh Thakkar <devarsht@...com>,
        Jayesh Choudhary <j-choudhary@...com>,
        Vignesh Raghavendra <vigneshr@...com>, Jai Luthra <j-luthra@...com>
Subject: [PATCH v2] dmaengine: ti: k3-udma: Fix BCHAN count with UHC and HC
 channels

From: Vignesh Raghavendra <vigneshr@...com>

Unlike other channel counts in CAPx registers, BCDMA BCHAN CNT doesn't
include UHC and HC BC channels. So include them explicitly to arrive at
total BC channel in the instance.

Fixes: 8844898028d4 ("dmaengine: ti: k3-udma: Add support for BCDMA channel TPL handling")
Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
Signed-off-by: Jai Luthra <j-luthra@...com>
---
Changes in v2:
- Add all BCHANs in a single operation
- Update the Fixes tag to the commit adding TPL support
- Link to v1: https://lore.kernel.org/r/20240604-bcdma_chan_cnt-v1-1-1e8932f68dca@ti.com
---
 drivers/dma/ti/k3-udma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 6400d06588a2..df507d96660b 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -4472,7 +4472,9 @@ static int udma_get_mmrs(struct platform_device *pdev, struct udma_dev *ud)
 		ud->rchan_cnt = UDMA_CAP2_RCHAN_CNT(cap2);
 		break;
 	case DMA_TYPE_BCDMA:
-		ud->bchan_cnt = BCDMA_CAP2_BCHAN_CNT(cap2);
+		ud->bchan_cnt = BCDMA_CAP2_BCHAN_CNT(cap2) +
+				BCDMA_CAP3_HBCHAN_CNT(cap3) +
+				BCDMA_CAP3_UBCHAN_CNT(cap3);
 		ud->tchan_cnt = BCDMA_CAP2_TCHAN_CNT(cap2);
 		ud->rchan_cnt = BCDMA_CAP2_RCHAN_CNT(cap2);
 		ud->rflow_cnt = ud->rchan_cnt;

---
base-commit: d97496ca23a2d4ee80b7302849404859d9058bcd
change-id: 20240604-bcdma_chan_cnt-bbc6c0c95259

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