KVM: arm64: vgic-v3: Log which GICv3 system registers are trapped

[mirror_ubuntu-zesty-kernel.git] / drivers / acpi / spcr.c

diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c
index b8019c4c1d38908895b21a92a094074ca2bd5bd8..2051a8ce9c853ff90592bc5e496ef85272ceaba1 100644 (file)
--- a/drivers/acpi/spcr.c
+++ b/drivers/acpi/spcr.c
@@ -16,6 +16,26 @@
 #include <linux/kernel.h>
 #include <linux/serial_core.h>
 
+/*
+ * Some Qualcomm Datacenter Technologies SoCs have a defective UART BUSY bit.
+ * Detect them by examining the OEM fields in the SPCR header, similiar to PCI
+ * quirk detection in pci_mcfg.c.
+ */
+static bool qdf2400_erratum_44_present(struct acpi_table_header *h)
+{
+       if (memcmp(h->oem_id, "QCOM  ", ACPI_OEM_ID_SIZE))
+               return false;
+
+       if (!memcmp(h->oem_table_id, "QDF2432 ", ACPI_OEM_TABLE_ID_SIZE))
+               return true;
+
+       if (!memcmp(h->oem_table_id, "QDF2400 ", ACPI_OEM_TABLE_ID_SIZE) &&
+                       h->oem_revision == 1)
+               return true;
+
+       return false;
+}
+
 /**
  * parse_spcr() - parse ACPI SPCR table and add preferred console
  *
@@ -93,6 +113,9 @@ int __init parse_spcr(bool earlycon)
                goto done;
        }
 
+       if (qdf2400_erratum_44_present(&table->header))
+               uart = "qdf2400_e44";
+
        snprintf(opts, sizeof(opts), "%s,%s,0x%llx,%d", uart, iotype,
                 table->serial_port.address, baud_rate);