On x86 architecture, the configuration of serial device maybe get from ACPI
DSDT, but the order of DSDT is not mandatory, result as array serial8250_ports
is out of order. This situation is more obvious in multiple serial port
mainboard. Sort it by unique id that in DSDT will fix it.
Signed-off-by: Scott Yuan <scottze...@gmail.com>
---
drivers/pnp/pnpacpi/core.c | 1 +
drivers/tty/serial/8250/8250_core.c | 40 ++++++++++++++++++++++++++++++++++++-
drivers/tty/serial/8250/8250_pnp.c | 12 +++++++++++
include/linux/pnp.h | 1 +
include/linux/serial_8250.h | 2 ++
5 files changed, 55 insertions(+), 1 deletion(-)
diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index a5c6cb7..84b518e 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -254,6 +254,7 @@ static int __init pnpacpi_add_device(struct acpi_device
*device)
return -ENOMEM;
dev->data = device;
+ dev->is_acpi = 1;
/* .enabled means the device can decode the resources */
dev->active = device->status.enabled;
if (acpi_has_method(device->handle, "_SRS"))
diff --git a/drivers/tty/serial/8250/8250_core.c
b/drivers/tty/serial/8250/8250_core.c
index 7a91c6d..0e5ece5 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -3221,6 +3221,41 @@ static struct uart_8250_port
*serial8250_find_match_or_unused(struct uart_port *
return NULL;
}
+static struct uart_8250_port *
+serial8250_find_match_sorted_port(struct uart_port *port)
+{
+ int i, j;
+ struct uart_8250_port *uart;
+
+ uart = container_of(port, struct uart_8250_port, port);
+
+ /*
+ * We need sorted array serial8250_ports, it is sort by ACPI
+ * device unique id, so find an apropriate position to insert.
+ */
+ for (i = 0; i < nr_uarts; i++) {
+ if (serial8250_ports[i].uid == 0 ||
+ uart->uid < serial8250_ports[i].uid)
+ break;
+ }
+
+ /*
+ * If current uid that in serial8250_ports is big than port uid,
+ * then move 8250 port data.
+ */
+ if (i < nr_uarts - 1 &&
+ uart->uid < serial8250_ports[i].uid) {
+ memmove(&serial8250_ports[i+1], &serial8250_ports[i],
+ (nr_uarts - i - 1) * sizeof(struct uart_8250_port));
+
+ /* modify port.line, since data moved */
+ for (j = i + 1; j < nr_uarts; j++)
+ serial8250_ports[j].port.line += 1;
+ }
+ serial8250_ports[i].uid = uart->uid;
+ return &serial8250_ports[i];
+}
+
/**
* serial8250_register_8250_port - register a serial port
* @up: serial port template
@@ -3244,7 +3279,10 @@ int serial8250_register_8250_port(struct uart_8250_port
*up)
mutex_lock(&serial_mutex);
- uart = serial8250_find_match_or_unused(&up->port);
+ if (up->is_acpi)
+ uart = serial8250_find_match_sorted_port(&up->port);
+ else
+ uart = serial8250_find_match_or_unused(&up->port);
if (uart && uart->port.type != PORT_8250_CIR) {
if (uart->port.dev)
uart_remove_one_port(&serial8250_reg, &uart->port);
diff --git a/drivers/tty/serial/8250/8250_pnp.c
b/drivers/tty/serial/8250/8250_pnp.c
index 682a2fb..c880ed3 100644
--- a/drivers/tty/serial/8250/8250_pnp.c
+++ b/drivers/tty/serial/8250/8250_pnp.c
@@ -15,6 +15,8 @@
#include <linux/pci.h>
#include <linux/pnp.h>
#include <linux/string.h>
+#include <acpi/acpi.h>
+#include <acpi/acpi_bus.h>
#include <linux/kernel.h>
#include <linux/serial_core.h>
#include <linux/bitops.h>
@@ -427,6 +429,8 @@ static int
serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
struct uart_8250_port uart;
+ struct acpi_device *acpi_dev;
+ char *serial_uid;
int ret, line, flags = dev_id->driver_data;
if (flags & UNKNOWN_DEV) {
@@ -451,6 +455,14 @@ serial_pnp_probe(struct pnp_dev *dev, const struct
pnp_device_id *dev_id)
} else
return -ENODEV;
+ if (dev->is_acpi) {
+ acpi_dev = dev->data;
+ serial_uid = acpi_dev->pnp.unique_id;
+ uart.is_acpi = 1;
+ if (kstrtoint(serial_uid, 10, &uart.uid))
+ return -EINVAL;
+ }
+
#ifdef SERIAL_DEBUG_PNP
printk(KERN_DEBUG
"Setup PNP port: port %x, mem 0x%lx, irq %d, type %d\n",
diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index 195aafc..d745f14 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -245,6 +245,7 @@ struct pnp_dev {
u64 dma_mask;
unsigned int number; /* used as an index, must be unique */
int status;
+ unsigned char is_acpi; /* is acpi device */
struct list_head global_list; /* node in global list of devices */
struct list_head protocol_list; /* node in list of device's protocol */
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index af47a8a..8f1e1bd 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -74,7 +74,9 @@ struct uart_8250_port {
struct list_head list; /* ports on this IRQ */
unsigned short capabilities; /* port capabilities */
unsigned short bugs; /* port bugs */
+ int uid; /* ACPI device unique id */
unsigned int tx_loadsz; /* transmit fifo load size */
+ unsigned char is_acpi; /* is acpi device */
unsigned char acr;
unsigned char ier;
unsigned char lcr;
--
1.9.1
--
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