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{
    "id": 2218226,
    "url": "http://patchwork.ozlabs.org/api/patches/2218226/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260331171248.973014-3-gaohan@iscas.ac.cn/",
    "project": {
        "id": 28,
        "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api",
        "name": "Linux PCI development",
        "link_name": "linux-pci",
        "list_id": "linux-pci.vger.kernel.org",
        "list_email": "linux-pci@vger.kernel.org",
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    "msgid": "<20260331171248.973014-3-gaohan@iscas.ac.cn>",
    "list_archive_url": null,
    "date": "2026-03-31T17:12:48",
    "name": "[2/2] riscv: dts: sophgo: Add dma-coherent to SG2042 PCIe controllers",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "28603674b323cd57b631ed819e712784050d19ff",
    "submitter": {
        "id": 92681,
        "url": "http://patchwork.ozlabs.org/api/people/92681/?format=api",
        "name": "Han Gao",
        "email": "gaohan@iscas.ac.cn"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260331171248.973014-3-gaohan@iscas.ac.cn/mbox/",
    "series": [
        {
            "id": 498232,
            "url": "http://patchwork.ozlabs.org/api/series/498232/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=498232",
            "date": "2026-03-31T17:12:47",
            "name": "riscv: sophgo: sg2042: Enable PCIe DMA coherence",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/498232/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2218226/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2218226/checks/",
    "tags": {},
    "related": [],
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        "From": "Han Gao <gaohan@iscas.ac.cn>",
        "To": "Bjorn Helgaas <bhelgaas@google.com>,\n Lorenzo Pieralisi <lpieralisi@kernel.org>, =?utf-8?q?Krzysztof_Wilczy=C5=84?=\n\t=?utf-8?q?ski?= <kwilczynski@kernel.org>,\n Manivannan Sadhasivam <mani@kernel.org>, Rob Herring <robh@kernel.org>,\n Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor Dooley <conor+dt@kernel.org>,\n Chen Wang <unicorn_wang@outlook.com>, Inochi Amaoto <inochiama@gmail.com>,\n Paul Walmsley <pjw@kernel.org>, Palmer Dabbelt <palmer@dabbelt.com>,\n Albert Ou <aou@eecs.berkeley.edu>, Alexandre Ghiti <alex@ghiti.fr>,\n Han Gao <gaohan@iscas.ac.cn>, Zixian Zeng <sycamoremoon376@gmail.com>",
        "Cc": "linux-pci@vger.kernel.org,\n\tdevicetree@vger.kernel.org,\n\tsophgo@lists.linux.dev,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-riscv@lists.infradead.org,\n\tHan Gao <rabenda.cn@gmail.com>,\n\tstable@vger.kernel.org",
        "Subject": "[PATCH 2/2] riscv: dts: sophgo: Add dma-coherent to SG2042 PCIe\n controllers",
        "Date": "Wed,  1 Apr 2026 01:12:48 +0800",
        "Message-ID": "<20260331171248.973014-3-gaohan@iscas.ac.cn>",
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        "In-Reply-To": "<20260331171248.973014-1-gaohan@iscas.ac.cn>",
        "References": "<20260331171248.973014-1-gaohan@iscas.ac.cn>",
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    "content": "SG2042's PCIe root complexes are cache-coherent with the CPU. Mark all\nfour PCIe controller nodes (pcie_rc0 through pcie_rc3) as dma-coherent\nso the kernel uses coherent DMA mappings instead of non-coherent bounce\nbuffering.\n\nCc: stable@vger.kernel.org\nSigned-off-by: Han Gao <gaohan@iscas.ac.cn>\n---\n arch/riscv/boot/dts/sophgo/sg2042.dtsi | 4 ++++\n 1 file changed, 4 insertions(+)",
    "diff": "diff --git a/arch/riscv/boot/dts/sophgo/sg2042.dtsi b/arch/riscv/boot/dts/sophgo/sg2042.dtsi\nindex 9fddf3f0b3b9..3af770549742 100644\n--- a/arch/riscv/boot/dts/sophgo/sg2042.dtsi\n+++ b/arch/riscv/boot/dts/sophgo/sg2042.dtsi\n@@ -417,6 +417,7 @@ pcie_rc0: pcie@7060000000 {\n \t\t\tvendor-id = <0x1f1c>;\n \t\t\tdevice-id = <0x2042>;\n \t\t\tcdns,no-bar-match-nbits = <48>;\n+\t\t\tdma-coherent;\n \t\t\tmsi-parent = <&msi>;\n \t\t\tstatus = \"disabled\";\n \t\t};\n@@ -439,6 +440,7 @@ pcie_rc1: pcie@7060800000 {\n \t\t\tvendor-id = <0x1f1c>;\n \t\t\tdevice-id = <0x2042>;\n \t\t\tcdns,no-bar-match-nbits = <48>;\n+\t\t\tdma-coherent;\n \t\t\tmsi-parent = <&msi>;\n \t\t\tstatus = \"disabled\";\n \t\t};\n@@ -461,6 +463,7 @@ pcie_rc2: pcie@7062000000 {\n \t\t\tvendor-id = <0x1f1c>;\n \t\t\tdevice-id = <0x2042>;\n \t\t\tcdns,no-bar-match-nbits = <48>;\n+\t\t\tdma-coherent;\n \t\t\tmsi-parent = <&msi>;\n \t\t\tstatus = \"disabled\";\n \t\t};\n@@ -483,6 +486,7 @@ pcie_rc3: pcie@7062800000 {\n \t\t\tvendor-id = <0x1f1c>;\n \t\t\tdevice-id = <0x2042>;\n \t\t\tcdns,no-bar-match-nbits = <48>;\n+\t\t\tdma-coherent;\n \t\t\tmsi-parent = <&msi>;\n \t\t\tstatus = \"disabled\";\n \t\t};\n",
    "prefixes": [
        "2/2"
    ]
}