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{
    "id": 2175747,
    "url": "http://patchwork.ozlabs.org/api/1.0/patches/2175747/?format=api",
    "project": {
        "id": 28,
        "url": "http://patchwork.ozlabs.org/api/1.0/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",
        "web_url": null,
        "scm_url": null,
        "webscm_url": null
    },
    "msgid": "<6128656.MhkbZ0Pkbq@rafael.j.wysocki>",
    "date": "2025-12-18T20:42:32",
    "name": "[v1,8/8] ACPI: bus: Rework the handling of \\_SB._OSC USB4 features",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "2b04161c040d26d4067daeeb3ee103f83e0b308a",
    "submitter": {
        "id": 64267,
        "url": "http://patchwork.ozlabs.org/api/1.0/people/64267/?format=api",
        "name": "Rafael J. Wysocki",
        "email": "rafael@kernel.org"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/6128656.MhkbZ0Pkbq@rafael.j.wysocki/mbox/",
    "series": [
        {
            "id": 485914,
            "url": "http://patchwork.ozlabs.org/api/1.0/series/485914/?format=api",
            "date": "2025-12-18T20:37:36",
            "name": "ACPI: bus: Rework of the \\_SB._OSC handling",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/485914/mbox/"
        }
    ],
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2175747/checks/",
    "tags": {},
    "headers": {
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        "From": "\"Rafael J. Wysocki\" <rafael@kernel.org>",
        "To": "Linux ACPI <linux-acpi@vger.kernel.org>",
        "Cc": "LKML <linux-kernel@vger.kernel.org>,\n Linux PCI <linux-pci@vger.kernel.org>, Bjorn Helgaas <helgaas@kernel.org>,\n Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,\n Hans de Goede <hansg@kernel.org>,\n Mario Limonciello <mario.limonciello@amd.com>",
        "Subject": "\n [PATCH v1 8/8] ACPI: bus: Rework the handling of \\_SB._OSC USB4 features",
        "Date": "Thu, 18 Dec 2025 21:42:32 +0100",
        "Message-ID": "<6128656.MhkbZ0Pkbq@rafael.j.wysocki>",
        "Organization": "Linux Kernel Development",
        "In-Reply-To": "<5049211.GXAFRqVoOG@rafael.j.wysocki>",
        "References": "<5049211.GXAFRqVoOG@rafael.j.wysocki>",
        "Precedence": "bulk",
        "X-Mailing-List": "linux-pci@vger.kernel.org",
        "List-Id": "<linux-pci.vger.kernel.org>",
        "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>",
        "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>",
        "MIME-Version": "1.0",
        "Content-Transfer-Encoding": "7Bit",
        "Content-Type": "text/plain; charset=\"UTF-8\""
    },
    "content": "From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>\n\nUse acpi_osc_handshake() introduced previously for implementing the\n\\_SB._OSC USB4 features control negotiation.\n\nSigned-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>\n---\n drivers/acpi/bus.c |   58 ++++++++---------------------------------------------\n 1 file changed, 9 insertions(+), 49 deletions(-)",
    "diff": "--- a/drivers/acpi/bus.c\n+++ b/drivers/acpi/bus.c\n@@ -499,19 +499,15 @@ static void acpi_bus_decode_usb_osc(cons\n \t       (bits & OSC_USB_XDOMAIN) ? '+' : '-');\n }\n \n-static u8 sb_usb_uuid_str[] = \"23A0D13A-26AB-486C-9C5F-0FFA525A575A\";\n static void acpi_bus_osc_negotiate_usb_control(void)\n {\n-\tu32 capbuf[3], *capbuf_ret;\n-\tstruct acpi_osc_context context = {\n-\t\t.uuid_str = sb_usb_uuid_str,\n-\t\t.rev = 1,\n-\t\t.cap.length = sizeof(capbuf),\n-\t\t.cap.pointer = capbuf,\n+\tstatic const u8 sb_usb_uuid_str[] = \"23A0D13A-26AB-486C-9C5F-0FFA525A575A\";\n+\tu32 capbuf[3], control, granted;\n+\tstruct acpi_buffer cap = {\n+\t\t.pointer = capbuf,\n+\t\t.length = sizeof(capbuf),\n \t};\n \tacpi_handle handle;\n-\tacpi_status status;\n-\tu32 control;\n \n \tif (!osc_sb_native_usb4_support_confirmed)\n \t\treturn;\n@@ -522,54 +518,18 @@ static void acpi_bus_osc_negotiate_usb_c\n \tcontrol = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |\n \t\t  OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;\n \n-\t/*\n-\t * Run _OSC first with query bit set, trying to get control over\n-\t * all tunneling. The platform can then clear out bits in the\n-\t * control dword that it does not want to grant to the OS.\n-\t */\n-\tcapbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;\n \tcapbuf[OSC_SUPPORT_DWORD] = 0;\n \tcapbuf[OSC_CONTROL_DWORD] = control;\n \n-\tstatus = acpi_run_osc(handle, &context);\n-\tif (ACPI_FAILURE(status))\n+\tif (acpi_osc_handshake(handle, sb_usb_uuid_str, 1, &cap))\n \t\treturn;\n \n-\tif (context.ret.length != sizeof(capbuf)) {\n-\t\tpr_info(\"USB4 _OSC: returned invalid length buffer\\n\");\n-\t\tgoto out_free;\n-\t}\n-\n-\t/*\n-\t * Run _OSC again now with query bit clear and the control dword\n-\t * matching what the platform granted (which may not have all\n-\t * the control bits set).\n-\t */\n-\tcapbuf_ret = context.ret.pointer;\n+\tgranted = capbuf[OSC_CONTROL_DWORD];\n \n-\tcapbuf[OSC_QUERY_DWORD] = 0;\n-\tcapbuf[OSC_CONTROL_DWORD] = capbuf_ret[OSC_CONTROL_DWORD];\n-\n-\tkfree(context.ret.pointer);\n-\n-\tstatus = acpi_run_osc(handle, &context);\n-\tif (ACPI_FAILURE(status))\n-\t\treturn;\n-\n-\tif (context.ret.length != sizeof(capbuf)) {\n-\t\tpr_info(\"USB4 _OSC: returned invalid length buffer\\n\");\n-\t\tgoto out_free;\n-\t}\n-\n-\tosc_sb_native_usb4_control =\n-\t\tcontrol & acpi_osc_ctx_get_pci_control(&context);\n+\tosc_sb_native_usb4_control = control & granted;\n \n \tacpi_bus_decode_usb_osc(\"USB4 _OSC: OS supports\", control);\n-\tacpi_bus_decode_usb_osc(\"USB4 _OSC: OS controls\",\n-\t\t\t\tosc_sb_native_usb4_control);\n-\n-out_free:\n-\tkfree(context.ret.pointer);\n+\tacpi_bus_decode_usb_osc(\"USB4 _OSC: OS controls\", granted);\n }\n \n /* --------------------------------------------------------------------------\n",
    "prefixes": [
        "v1",
        "8/8"
    ]
}