linux-kernel - [PATCH v2 3/4] PCI/ACPI: Add Broadcom bcm2711 MCFG quirk

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Message-Id: <20210819215655.84866-4-jeremy.linton@arm.com>
Date:   Thu, 19 Aug 2021 16:56:54 -0500
From:   Jeremy Linton <jeremy.linton@....com>
To:     linux-pci@...r.kernel.org
Cc:     lorenzo.pieralisi@....com, nsaenz@...nel.org, bhelgaas@...gle.com,
        rjw@...ysocki.net, lenb@...nel.org, robh@...nel.org, kw@...ux.com,
        f.fainelli@...il.com, sdonthineni@...dia.com,
        stefan.wahren@...e.com, bcm-kernel-feedback-list@...adcom.com,
        linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jeremy Linton <jeremy.linton@....com>
Subject: [PATCH v2 3/4] PCI/ACPI: Add Broadcom bcm2711 MCFG quirk

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 <jeremy.linton@....com>
---
 drivers/acpi/pci_mcfg.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index 53cab975f612..4b991ee5c66c 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),
+
+	{ "bcm2711", "", 0, 0, MCFG_BUS_ANY, &bcm2711_pcie_ops,
+	  DEFINE_RES_MEM(0xFD500000, 0xA000) },
 };
 
 static char mcfg_oem_id[ACPI_OEM_ID_SIZE];
@@ -198,8 +201,18 @@ 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)) {
+		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