[SERIAL] 8250: add UART_CAP_SLEEP capability.

drivers/serial/8250.c

@@ -164,13 +164,13 @@ static const struct serial8250_config uart_config[PORT_MAX_8250+1] = {
 	{ "16550",	1,	1,	0 },
 	{ "16550A",	16,	16,	UART_CAP_FIFO },
 	{ "Cirrus",	1, 	1,	0 },
-	{ "ST16650",	1,	1,	UART_CAP_FIFO | UART_STARTECH },
-	{ "ST16650V2",	32,	16,	UART_CAP_FIFO | UART_STARTECH },
-	{ "TI16750",	64,	64,	UART_CAP_FIFO },
+	{ "ST16650",	1,	1,	UART_CAP_FIFO | UART_CAP_SLEEP | UART_STARTECH },
+	{ "ST16650V2",	32,	16,	UART_CAP_FIFO | UART_CAP_SLEEP | UART_STARTECH },
+	{ "TI16750",	64,	64,	UART_CAP_FIFO | UART_CAP_SLEEP },
 	{ "Startech",	1,	1,	0 },
 	{ "16C950/954",	128,	128,	UART_CAP_FIFO },
-	{ "ST16654",	64,	32,	UART_CAP_FIFO | UART_STARTECH },
-	{ "XR16850",	128,	128,	UART_CAP_FIFO | UART_STARTECH },
+	{ "ST16654",	64,	32,	UART_CAP_FIFO | UART_CAP_SLEEP | UART_STARTECH },
+	{ "XR16850",	128,	128,	UART_CAP_FIFO | UART_CAP_SLEEP | UART_STARTECH },
 	{ "RSA",	2048,	2048,	UART_CAP_FIFO },
 	{ "NS16550A",	16,	16,	UART_CAP_FIFO | UART_NATSEMI },
 	{ "XScale",	32,	32,	UART_CAP_FIFO },
@@ -262,18 +262,18 @@ static inline void serial8250_clear_fifos(struct uart_8250_port *p)
  */
 static inline void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
 {
-	if (up->capabilities & UART_STARTECH) {
-		serial_outp(up, UART_LCR, 0xBF);
-		serial_outp(up, UART_EFR, UART_EFR_ECB);
-		serial_outp(up, UART_LCR, 0);
-		serial_outp(up, UART_IER, sleep ? UART_IERX_SLEEP : 0);
-		serial_outp(up, UART_LCR, 0xBF);
-		serial_outp(up, UART_EFR, 0);
-		serial_outp(up, UART_LCR, 0);
+	if (p->capabilities & UART_CAP_SLEEP) {
+		if (p->capabilities & UART_STARTECH) {
+			serial_outp(p, UART_LCR, 0xBF);
+			serial_outp(p, UART_EFR, UART_EFR_ECB);
+			serial_outp(p, UART_LCR, 0);
+		}
+		serial_outp(p, UART_IER, sleep ? UART_IERX_SLEEP : 0);
+		if (p->capabilities & UART_STARTECH) {
+			serial_outp(p, UART_LCR, 0xBF);
+			serial_outp(p, UART_EFR, 0);
+			serial_outp(p, UART_LCR, 0);
 		}
-	if (up->port.type == PORT_16750) {
-		/* Arrange to enter sleep mode */
-		serial_outp(up, UART_IER, sleep ? UART_IERX_SLEEP : 0);
 	}
 }
 

drivers/serial/8250.h

@@ -44,6 +44,7 @@ struct serial8250_config {
 };
 
 #define UART_CAP_FIFO	(1 << 8)	/* UART has FIFO */
+#define UART_CAP_SLEEP	(1 << 10)	/* UART has IER sleep */
 
 #undef SERIAL_DEBUG_PCI