linux-kernel - [PATCH 6.12.y] dmaengine: ti: k3-udma: Enable second resource range for BCDMA and PKTDMA

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Message-ID: <20260127191105.1961020-1-s-adivi@ti.com>
Date: Wed, 28 Jan 2026 00:41:05 +0530
From: Sai Sree Kartheek Adivi <s-adivi@...com>
To: <stable@...r.kernel.org>
CC: <s-vadapalli@...com>, <peter.ujfalusi@...il.com>, <vkoul@...nel.org>,
	<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <vigneshr@...com>
Subject: [PATCH 6.12.y] dmaengine: ti: k3-udma: Enable second resource range for BCDMA and PKTDMA

From: Siddharth Vadapalli <s-vadapalli@...com>

commit 566beb347eded7a860511164a7a163bc882dc4d0 upstream.

The SoC DMA resources for UDMA, BCDMA and PKTDMA can be described via a
combination of up to two resource ranges. The first resource range handles
the default partitioning wherein all resources belonging to that range are
allocated to a single entity and form a continuous range. For use-cases
where the resources are shared across multiple entities and require to be
described via discontinuous ranges, a second resource range is required.

Currently, udma_setup_resources() supports handling resources that belong
to the second range. Extend bcdma_setup_resources() and
pktdma_setup_resources() to support the same.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@...il.com>
Link: https://lore.kernel.org/r/20250205121805.316792-1-s-vadapalli@ti.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Tested-by: Sai Sree Kartheek Adivi <s-adivi@...com>
Signed-off-by: Sai Sree Kartheek Adivi <s-adivi@...com>
---

Hi,

This patch is upstreamed at [1]. This is required for ethernet to be
functional on TI AM62P SoC.

Thanks,
Kartheek

[1] v6.14-rc1-24-g566beb347ede
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/dma/ti/k3-udma.c?id=566beb347eded7a860511164a7a163bc882dc4d0

 drivers/dma/ti/k3-udma.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 38b54719587cf..e877cd50898bc 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -4876,6 +4876,12 @@ static int bcdma_setup_resources(struct udma_dev *ud)
 				irq_res.desc[i].start = rm_res->desc[i].start +
 							oes->bcdma_bchan_ring;
 				irq_res.desc[i].num = rm_res->desc[i].num;
+
+				if (rm_res->desc[i].num_sec) {
+					irq_res.desc[i].start_sec = rm_res->desc[i].start_sec +
+									oes->bcdma_bchan_ring;
+					irq_res.desc[i].num_sec = rm_res->desc[i].num_sec;
+				}
 			}
 		}
 	} else {
@@ -4899,6 +4905,15 @@ static int bcdma_setup_resources(struct udma_dev *ud)
 				irq_res.desc[i + 1].start = rm_res->desc[j].start +
 							oes->bcdma_tchan_ring;
 				irq_res.desc[i + 1].num = rm_res->desc[j].num;
+
+				if (rm_res->desc[j].num_sec) {
+					irq_res.desc[i].start_sec = rm_res->desc[j].start_sec +
+									oes->bcdma_tchan_data;
+					irq_res.desc[i].num_sec = rm_res->desc[j].num_sec;
+					irq_res.desc[i + 1].start_sec = rm_res->desc[j].start_sec +
+									oes->bcdma_tchan_ring;
+					irq_res.desc[i + 1].num_sec = rm_res->desc[j].num_sec;
+				}
 			}
 		}
 	}
@@ -4919,6 +4934,15 @@ static int bcdma_setup_resources(struct udma_dev *ud)
 				irq_res.desc[i + 1].start = rm_res->desc[j].start +
 							oes->bcdma_rchan_ring;
 				irq_res.desc[i + 1].num = rm_res->desc[j].num;
+
+				if (rm_res->desc[j].num_sec) {
+					irq_res.desc[i].start_sec = rm_res->desc[j].start_sec +
+									oes->bcdma_rchan_data;
+					irq_res.desc[i].num_sec = rm_res->desc[j].num_sec;
+					irq_res.desc[i + 1].start_sec = rm_res->desc[j].start_sec +
+									oes->bcdma_rchan_ring;
+					irq_res.desc[i + 1].num_sec = rm_res->desc[j].num_sec;
+				}
 			}
 		}
 	}
@@ -5053,6 +5077,12 @@ static int pktdma_setup_resources(struct udma_dev *ud)
 			irq_res.desc[i].start = rm_res->desc[i].start +
 						oes->pktdma_tchan_flow;
 			irq_res.desc[i].num = rm_res->desc[i].num;
+
+			if (rm_res->desc[i].num_sec) {
+				irq_res.desc[i].start_sec = rm_res->desc[i].start_sec +
+								oes->pktdma_tchan_flow;
+				irq_res.desc[i].num_sec = rm_res->desc[i].num_sec;
+			}
 		}
 	}
 	rm_res = tisci_rm->rm_ranges[RM_RANGE_RFLOW];
@@ -5064,6 +5094,12 @@ static int pktdma_setup_resources(struct udma_dev *ud)
 			irq_res.desc[i].start = rm_res->desc[j].start +
 						oes->pktdma_rchan_flow;
 			irq_res.desc[i].num = rm_res->desc[j].num;
+
+			if (rm_res->desc[j].num_sec) {
+				irq_res.desc[i].start_sec = rm_res->desc[j].start_sec +
+								oes->pktdma_rchan_flow;
+				irq_res.desc[i].num_sec = rm_res->desc[j].num_sec;
+			}
 		}
 	}
 	ret = ti_sci_inta_msi_domain_alloc_irqs(ud->dev, &irq_res);
-- 
2.34.1