---

yaml --- r: 109408 b: refs/heads/master c: 363f66f h: refs/heads/master v: v3
git-mirror · Sep 3, 2008 · a686f63 · a686f63
1 parent edd50a9
commit a686f63
Show file tree

Hide file tree

Showing 3 changed files with 14 additions and 5 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: bd7aa4b2dafd8e653df265479d99c80747602a50
+refs/heads/master: 363f66fe06c75270b669c88e321e6b354ba0201e
diff --git a/trunk/drivers/serial/8250.c b/trunk/drivers/serial/8250.c
@@ -1908,14 +1908,22 @@ static int serial8250_startup(struct uart_port *port)
 		 * kick the UART on a regular basis.
 		 */
 		if (!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) {
+			up->bugs |= UART_BUG_THRE;
 			pr_debug("ttyS%d - using backup timer\n", port->line);
-			up->timer.function = serial8250_backup_timeout;
-			up->timer.data = (unsigned long)up;
-			mod_timer(&up->timer, jiffies +
-				poll_timeout(up->port.timeout) + HZ / 5);
 		}
 	}
 
+	/*
+	 * The above check will only give an accurate result the first time
+	 * the port is opened so this value needs to be preserved.
+	 */
+	if (up->bugs & UART_BUG_THRE) {
+		up->timer.function = serial8250_backup_timeout;
+		up->timer.data = (unsigned long)up;
+		mod_timer(&up->timer, jiffies +
+			  poll_timeout(up->port.timeout) + HZ / 5);
+	}
+
 	/*
 	 * If the "interrupt" for this port doesn't correspond with any
 	 * hardware interrupt, we use a timer-based system.  The original

diff --git a/trunk/drivers/serial/8250.h b/trunk/drivers/serial/8250.h
@@ -47,6 +47,7 @@ struct serial8250_config {
 #define UART_BUG_QUOT	(1 << 0)	/* UART has buggy quot LSB */
 #define UART_BUG_TXEN	(1 << 1)	/* UART has buggy TX IIR status */
 #define UART_BUG_NOMSR	(1 << 2)	/* UART has buggy MSR status bits (Au1x00) */
+#define UART_BUG_THRE	(1 << 3)	/* UART has buggy THRE reassertion */
 
 #define PROBE_RSA	(1 << 0)
 #define PROBE_ANY	(~0)