Thread (28 messages) 28 messages, 6 authors, 2021-10-22

Re: [PATCH v3 3/4] PCI/ACPI: Add Broadcom bcm2711 MCFG quirk

From: "Rafael J. Wysocki" <rafael@kernel.org>
Date: 2021-09-13 16:12:18
Also in: linux-acpi, linux-pci, lkml

On Thu, Aug 26, 2021 at 9:16 AM Jeremy Linton [off-list ref] wrote:
Now that there is a bcm2711 quirk, it needs to be enabled when the
MCFG is missing. Use an ACPI namespace _DSD property
"linux-ecam-quirk-id" as an alternative to the MCFG OEM.

Signed-off-by: Jeremy Linton <redacted>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <redacted>
quoted hunk ↗ jump to hunk
---
 drivers/acpi/pci_mcfg.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index 53cab975f612..04c517418365 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -169,6 +169,9 @@ static struct mcfg_fixup mcfg_quirks[] = {
        ALTRA_ECAM_QUIRK(1, 13),
        ALTRA_ECAM_QUIRK(1, 14),
        ALTRA_ECAM_QUIRK(1, 15),
+
+       { "bc2711", "", 0, 0, MCFG_BUS_ANY, &bcm2711_pcie_ops,
+         DEFINE_RES_MEM(0xFD500000, 0xA000) },
 };

 static char mcfg_oem_id[ACPI_OEM_ID_SIZE];
@@ -198,8 +201,22 @@ static void pci_mcfg_apply_quirks(struct acpi_pci_root *root,
        u16 segment = root->segment;
        struct resource *bus_range = &root->secondary;
        struct mcfg_fixup *f;
+       const char *soc;
        int i;

+       /*
+        * This may be a machine with a PCI/SMC conduit, which means it doesn't
+        * have an MCFG. Use an ACPI namespace definition instead.
+        */
+       if (!fwnode_property_read_string(acpi_fwnode_handle(root->device),
+                                        "linux-ecam-quirk-id", &soc)) {
+               if (strlen(soc) != ACPI_OEM_ID_SIZE)
+                       dev_err(&root->device->dev, "ECAM quirk should be %d characters\n",
+                               ACPI_OEM_ID_SIZE);
+               else
+                       memcpy(mcfg_oem_id, soc, ACPI_OEM_ID_SIZE);
+       }
+
        for (i = 0, f = mcfg_quirks; i < ARRAY_SIZE(mcfg_quirks); i++, f++) {
                if (pci_mcfg_quirk_matches(f, segment, bus_range)) {
                        if (f->cfgres.start)
--
2.31.1
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