[PATCH] jsm: fix for high baud rates problem

Scott Kilau <[e-mail]>

Digi serial port console doesn't work when baud rates are set higher than
38400. So the lookup table and code in jsm_neo.c has been modified and
tested. Please let me have the feed-back.

Signed-off-by: V.Ananda Krishnan <[e-mail]>
Cc: Alan Cox <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/serial/jsm/jsm_neo.c

···
 			baud = ch->ch_custom_speed;
 			if (ch->ch_flags & CH_BAUD0)
 				ch->ch_flags &= ~(CH_BAUD0);
-		} else {
-			int iindex = 0;
-			int jindex = 0;
+	} else {
+		int i;
+		unsigned int cflag;
+		static struct {
+			unsigned int rate;
+			unsigned int cflag;
+		} baud_rates[] = {
+			{ 921600, B921600 },
+			{ 460800, B460800 },
+			{ 230400, B230400 },
+			{ 115200, B115200 },
+			{  57600, B57600  },
+			{  38400, B38400  },
+			{  19200, B19200  },
+			{   9600, B9600   },
+			{   4800, B4800   },
+			{   2400, B2400   },
+			{   1200, B1200   },
+			{    600, B600    },
+			{    300, B300    },
+			{    200, B200    },
+			{    150, B150    },
+			{    134, B134    },
+			{    110, B110    },
+			{     75, B75     },
+			{     50, B50     },
+		};
 
-			const u64 bauds[4][16] = {
-				{
-					0,	50,	75,	110,
-					134,	150,	200,	300,
-					600,	1200,	1800,	2400,
-					4800,	9600,	19200,	38400 },
-				{
-					0,	57600,	115200, 230400,
-					460800, 150,	200,	921600,
-					600,	1200,	1800,	2400,
-					4800,	9600,	19200,	38400 },
-				{
-					0,	57600,	76800, 115200,
-					131657, 153600, 230400, 460800,
-					921600, 1200,	1800,	2400,
-					4800,	9600,	19200,	38400 },
-				{
-					0,	57600,	115200, 230400,
-					460800, 150,	200,	921600,
-					600,	1200,	1800,	2400,
-					4800,	9600,	19200,	38400 }
-			};
-
-			baud = C_BAUD(ch->uart_port.info->tty) & 0xff;
-
-			if (ch->ch_c_cflag & CBAUDEX)
-				iindex = 1;
-
-			jindex = baud;
-
-			if ((iindex >= 0) && (iindex < 4) && (jindex >= 0) && (jindex < 16))
-				baud = bauds[iindex][jindex];
-			else {
-				jsm_printk(IOCTL, DEBUG, &ch->ch_bd->pci_dev,
-					"baud indices were out of range (%d)(%d)",
-				iindex, jindex);
-				baud = 0;
+		cflag = C_BAUD(ch->uart_port.info->tty);
+		baud = 9600;
+		for (i = 0; i < ARRAY_SIZE(baud_rates); i++) {
+			if (baud_rates[i].cflag == cflag) {
+				baud = baud_rates[i].rate;
+				break;
 			}
-
-			if (baud == 0)
-				baud = 9600;
-
-			if (ch->ch_flags & CH_BAUD0)
-				ch->ch_flags &= ~(CH_BAUD0);
 		}
+
+		if (ch->ch_flags & CH_BAUD0)
+			ch->ch_flags &= ~(CH_BAUD0);
+	}
 
 	if (ch->ch_c_cflag & PARENB)
 		lcr |= UART_LCR_PARITY;