From: Christopher Covington <cov@xxxxxxxxxxxxxx>
[ Upstream commit 2ca5b8ddc6f70d77a51851ba5e5cd0d39c27dd88 ]
The Qualcomm Technologies QDF2432 SoC does not support accesses smaller
than 32 bits to the PCI configuration space. Register the appropriate
quirk.
[bhelgaas: add QCOM_ECAM32 macro, ifdef for ACPI and PCI_QUIRKS]
Signed-off-by: Christopher Covington <cov@xxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
drivers/acpi/pci_mcfg.c | 11 +++++++++++
drivers/pci/ecam.c | 12 ++++++++++++
include/linux/pci-ecam.h | 4 ++++
3 files changed, 27 insertions(+)
diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index 1ef7285..cee33b0 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -51,6 +51,17 @@ struct mcfg_fixup {
static struct mcfg_fixup mcfg_quirks[] = {
/* { OEM_ID, OEM_TABLE_ID, REV, SEGMENT, BUS_RANGE, ops, cfgres }, */
+
+#define QCOM_ECAM32(seg) \
+ { "QCOM ", "QDF2432 ", 1, seg, MCFG_BUS_ANY, &pci_32b_ops }
+ QCOM_ECAM32(0),
+ QCOM_ECAM32(1),
+ QCOM_ECAM32(2),
+ QCOM_ECAM32(3),
+ QCOM_ECAM32(4),
+ QCOM_ECAM32(5),
+ QCOM_ECAM32(6),
+ QCOM_ECAM32(7),
};
static char mcfg_oem_id[ACPI_OEM_ID_SIZE];
diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
index 43ed08d..2fee61b 100644
--- a/drivers/pci/ecam.c
+++ b/drivers/pci/ecam.c
@@ -162,3 +162,15 @@ struct pci_ecam_ops pci_generic_ecam_ops = {
.write = pci_generic_config_write,
}
};
+
+#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
+/* ECAM ops for 32-bit access only (non-compliant) */
+struct pci_ecam_ops pci_32b_ops = {
+ .bus_shift = 20,
+ .pci_ops = {
+ .map_bus = pci_ecam_map_bus,
+ .read = pci_generic_config_read32,
+ .write = pci_generic_config_write32,
+ }
+};
+#endif
diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 7adad20..739d233 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -59,6 +59,10 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
/* default ECAM ops */
extern struct pci_ecam_ops pci_generic_ecam_ops;
+#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
+extern struct pci_ecam_ops pci_32b_ops; /* 32-bit accesses only */
+#endif
+
#ifdef CONFIG_PCI_HOST_GENERIC
/* for DT-based PCI controllers that support ECAM */
int pci_host_common_probe(struct platform_device *pdev,
--
2.9.3