[2.6.27.y PATCH 2/4] DVB: s5h1411: bugfix: Setting serial or parallel mode could destroy bits

[Michael Krufky <mkrufky@xxxxxxxxxxx>]

From: Steven Toth <stoth@xxxxxxxxxxx>

DVB: s5h1411: bugfix: Setting serial or parallel mode could destroy bits

Adding a serialmode function to read/and/or/write the register for safety.

Signed-off-by: Steven Toth <stoth@xxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Michael Krufky <mkrufky@xxxxxxxxxxx>
(cherry picked from commit 1af46b450fa49c57d73764d66f267335ccd807e2)
---
 drivers/media/dvb/frontends/s5h1411.c |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/media/dvb/frontends/s5h1411.c b/drivers/media/dvb/frontends/s5h1411.c
index 2da1a37..a710ea3 100644
--- a/drivers/media/dvb/frontends/s5h1411.c
+++ b/drivers/media/dvb/frontends/s5h1411.c
@@ -471,6 +471,20 @@ static int s5h1411_set_spectralinversion(struct dvb_frontend *fe, int inversion)
 	return s5h1411_writereg(state, S5H1411_I2C_TOP_ADDR, 0x24, val);
 }
 
+static int s5h1411_set_serialmode(struct dvb_frontend *fe, int serial)
+{
+	struct s5h1411_state *state = fe->demodulator_priv;
+	u16 val;
+
+	dprintk("%s(%d)\n", __func__, serial);
+	val = s5h1411_readreg(state, S5H1411_I2C_TOP_ADDR, 0xbd) & ~0x100;
+
+	if (serial == 1)
+		val |= 0x100;
+
+	return s5h1411_writereg(state, S5H1411_I2C_TOP_ADDR, 0xbd, val);
+}
+
 static int s5h1411_enable_modulation(struct dvb_frontend *fe,
 				     fe_modulation_t m)
 {
@@ -612,10 +626,10 @@ static int s5h1411_init(struct dvb_frontend *fe)
 
 	if (state->config->output_mode == S5H1411_SERIAL_OUTPUT)
 		/* Serial */
-		s5h1411_writereg(state, S5H1411_I2C_TOP_ADDR, 0xbd, 0x1101);
+		s5h1411_set_serialmode(fe, 1);
 	else
 		/* Parallel */
-		s5h1411_writereg(state, S5H1411_I2C_TOP_ADDR, 0xbd, 0x1001);
+		s5h1411_set_serialmode(fe, 0);
 
 	s5h1411_set_spectralinversion(fe, state->config->inversion);
 	s5h1411_set_if_freq(fe, state->config->vsb_if);

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