diff -purN img/2.6_kernel/drivers/serial/8250.c 2.6_kernel/drivers/serial/8250.c
--- img/2.6_kernel/drivers/serial/8250.c	2008-05-09 18:50:53.000000000 -0500
+++ 2.6_kernel/drivers/serial/8250.c	2008-06-03 19:44:24.000000000 -0500
@@ -1221,6 +1221,14 @@ static inline void __stop_tx(struct uart
 		p->ier &= ~UART_IER_THRI;
 		serial_out(p, UART_IER, p->ier);
 	}
+#ifdef CONFIG_OMAP3_PM
+	{
+		/* Advertise partial idle to save power. RX side can do async wake */
+		unsigned int tmp;
+		tmp = (serial_in(p, UART_OMAP_SYSC) & 0x7) | (2 << 3);
+		serial_out(p, UART_OMAP_SYSC, tmp); /* smart-idle */
+	}
+#endif
 }
 
 static void serial8250_stop_tx(struct uart_port *port)
@@ -1268,6 +1276,15 @@ static void serial8250_start_tx(struct u
 		up->acr &= ~UART_ACR_TXDIS;
 		serial_icr_write(up, UART_ACR, up->acr);
 	}
+#ifdef CONFIG_OMAP3_PM
+	{
+		/* Don't advertise partial idle else TX irqs will not be seen */
+		/* Alternative is to set kernel timer at fifo drain rate */
+		unsigned int tmp;
+		tmp = (serial_in(up, UART_OMAP_SYSC) & 0x7) | (1 << 3);
+		serial_out(up, UART_OMAP_SYSC, tmp); /* no-idle */
+	}
+#endif
 }