#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
*
{
static char opts[64];
struct acpi_table_spcr *table;
- acpi_size table_size;
acpi_status status;
char *uart;
char *iotype;
if (acpi_disabled)
return -ENODEV;
- status = acpi_get_table_with_size(ACPI_SIG_SPCR, 0,
- (struct acpi_table_header **)&table,
- &table_size);
+ status = acpi_get_table(ACPI_SIG_SPCR, 0,
+ (struct acpi_table_header **)&table);
if (ACPI_FAILURE(status))
return -ENOENT;
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);
err = add_preferred_console(uart, 0, opts + strlen(uart) + 1);
done:
- early_acpi_os_unmap_memory((void __iomem *)table, table_size);
+ acpi_put_table((struct acpi_table_header *)table);
return err;
}