V4L/DVB (7654): tda10086: make the xtal frequency a configuration option

Some DVB-S boards, i.e. with the SD1878 tuner, use a 4 MHz reference frequency.
This reqires a different setup of the clock PLL.
This patch adds an enum to the tda10086_config struct and sets the proper
values for the boards.

This patch also fixes the DVB-S section of the MD7134_BRIDGE_2
Signed-off-by: Hartmut Hackmann <hartmut.hackmann@t-online.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/dvb-usb/ttusb2.c

@@ -147,6 +147,7 @@ static struct tda10086_config tda10086_config = {
 	.demod_address = 0x0e,
 	.invert = 0,
 	.diseqc_tone = 1,
+	.xtal_freq = TDA10086_XTAL_16M,
 };
 
 static int ttusb2_frontend_attach(struct dvb_usb_adapter *adap)

drivers/media/dvb/frontends/tda10086.c

@@ -128,10 +128,15 @@ static int tda10086_init(struct dvb_frontend* fe)
 	tda10086_write_byte(state, 0x32, 0x00); // irq off
 	tda10086_write_byte(state, 0x31, 0x56); // setup AFC
 
-	// setup PLL (assumes 16Mhz XIN)
+	// setup PLL (this assumes SACLK = 96MHz)
 	tda10086_write_byte(state, 0x55, 0x2c); // misc PLL setup
+	if (state->config->xtal_freq == TDA10086_XTAL_16M) {
 		tda10086_write_byte(state, 0x3a, 0x0b); // M=12
 		tda10086_write_byte(state, 0x3b, 0x01); // P=2
+	} else {
+		tda10086_write_byte(state, 0x3a, 0x17); // M=24
+		tda10086_write_byte(state, 0x3b, 0x00); // P=1
+	}
 	tda10086_write_mask(state, 0x55, 0x20, 0x00); // powerup PLL
 
 	// setup TS interface

drivers/media/dvb/frontends/tda10086.h

@@ -26,6 +26,11 @@
 #include <linux/dvb/frontend.h>
 #include <linux/firmware.h>
 
+enum tda10086_xtal {
+	TDA10086_XTAL_16M,
+	TDA10086_XTAL_4M
+};
+
 struct tda10086_config
 {
 	/* the demodulator's i2c address */
@@ -36,6 +41,9 @@ struct tda10086_config
 
 	/* do we need the diseqc signal with carrier? */
 	u8 diseqc_tone;
+
+	/* frequency of the reference xtal */
+	enum tda10086_xtal xtal_freq;
 };
 
 #if defined(CONFIG_DVB_TDA10086) || (defined(CONFIG_DVB_TDA10086_MODULE) && defined(MODULE))

drivers/media/dvb/ttpci/budget.c

@@ -365,6 +365,7 @@ static struct tda10086_config tda10086_config = {
 	.demod_address = 0x0e,
 	.invert = 0,
 	.diseqc_tone = 1,
+	.xtal_freq = TDA10086_XTAL_16M,
 };
 
 static u8 read_pwm(struct budget* budget)

drivers/media/video/saa7134/saa7134-dvb.c

@@ -851,6 +851,14 @@ static struct tda10086_config flydvbs = {
 	.demod_address = 0x0e,
 	.invert = 0,
 	.diseqc_tone = 0,
+	.xtal_freq = TDA10086_XTAL_16M,
+};
+
+static struct tda10086_config sd1878_4m = {
+	.demod_address = 0x0e,
+	.invert = 0,
+	.diseqc_tone = 0,
+	.xtal_freq = TDA10086_XTAL_4M,
 };
 
 /* ------------------------------------------------------------------
@@ -1206,7 +1214,7 @@ static int dvb_init(struct saa7134_dev *dev)
 		break;
 	case SAA7134_BOARD_MD7134_BRIDGE_2:
 		dev->dvb.frontend = dvb_attach(tda10086_attach,
-						&flydvbs, &dev->i2c_adap);
+						&sd1878_4m, &dev->i2c_adap);
 		if (dev->dvb.frontend) {
 			struct dvb_frontend *fe;
 			if (dvb_attach(dvb_pll_attach, dev->dvb.frontend, 0x60,