NS16550A: Restore HS settings in EXCR2 on resume

After a suspend/resume cycle, the UART may have been reset into
low-speed mode -- either because it's actually been reset, or because
the firmware pokes at the old-style divisor registers. If we detected it
as a NS16550A SuperIO chip in the first place and set baud_base to
921600, then we should do so again in the resume path.

This patch adds that code to serial8250_resume_port(), and also makes
serial8250_resume() actually call serial8250_resume_port() for each port
instead of just calling uart_resume_port() directly. And thus fixes
serial port operation after suspend/resume.

It also fixes a bogus comment where we write the EXCR2 register with a
comment saying /* EXCR1 */

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 3 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 48e259a0167d..c84dab083a85 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -894,7 +894,7 @@ static void autoconfig_16550a(struct uart_8250_port *up)
                         quot = serial_dl_read(up);
                         quot <<= 3;
 
-                        status1 = serial_in(up, 0x04); /* EXCR1 */
+                        status1 = serial_in(up, 0x04); /* EXCR2 */
                         status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
                         status1 |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
                         serial_outp(up, 0x04, status1);
@@ -2617,7 +2617,22 @@ void serial8250_suspend_port(int line)
  */
 void serial8250_resume_port(int line)
 {
-        uart_resume_port(&serial8250_reg, &serial8250_ports[line].port);
+        struct uart_8250_port *up = &serial8250_ports[line];
+
+        if (up->capabilities & UART_NATSEMI) {
+                unsigned char tmp;
+
+                /* Ensure it's still in high speed mode */
+                serial_outp(up, UART_LCR, 0xE0);
+
+                tmp = serial_in(up, 0x04); /* EXCR2 */
+                tmp &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
+                tmp |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
+                serial_outp(up, 0x04, tmp);
+
+                serial_outp(up, UART_LCR, 0);
+        }
+        uart_resume_port(&serial8250_reg, &up->port);
 }
 
 /*
@@ -2694,7 +2709,7 @@ static int serial8250_resume(struct platform_device *dev)
                 struct uart_8250_port *up = &serial8250_ports[i];
 
                 if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
-                        uart_resume_port(&serial8250_reg, &up->port);
+                        serial8250_resume_port(i);
         }
 
         return 0;