1 files changed, 31 insertions, 11 deletions

diff --git a/drivers/media/dvb-frontends/dib8000.c b/drivers/media/dvb-frontends/dib8000.c
index a54182dd0e91..362de38a7d8e 100644
--- a/drivers/media/dvb-frontends/dib8000.c
+++ b/drivers/media/dvb-frontends/dib8000.c
@@ -157,15 +157,10 @@ static u16 dib8000_i2c_read16(struct i2c_device *i2c, u16 reg)
 	return ret;
 }
 
-static u16 dib8000_read_word(struct dib8000_state *state, u16 reg)
+static u16 __dib8000_read_word(struct dib8000_state *state, u16 reg)
 {
 	u16 ret;
 
-	if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
-		dprintk("could not acquire lock");
-		return 0;
-	}
-
 	state->i2c_write_buffer[0] = reg >> 8;
 	state->i2c_write_buffer[1] = reg & 0xff;
 
@@ -183,6 +178,21 @@ static u16 dib8000_read_word(struct dib8000_state *state, u16 reg)
 		dprintk("i2c read error on %d", reg);
 
 	ret = (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
+
+	return ret;
+}
+
+static u16 dib8000_read_word(struct dib8000_state *state, u16 reg)
+{
+	u16 ret;
+
+	if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+		dprintk("could not acquire lock");
+		return 0;
+	}
+
+	ret = __dib8000_read_word(state, reg);
+
 	mutex_unlock(&state->i2c_buffer_lock);
 
 	return ret;
@@ -192,8 +202,15 @@ static u32 dib8000_read32(struct dib8000_state *state, u16 reg)
 {
 	u16 rw[2];
 
-	rw[0] = dib8000_read_word(state, reg + 0);
-	rw[1] = dib8000_read_word(state, reg + 1);
+	if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
+		dprintk("could not acquire lock");
+		return 0;
+	}
+
+	rw[0] = __dib8000_read_word(state, reg + 0);
+	rw[1] = __dib8000_read_word(state, reg + 1);
+
+	mutex_unlock(&state->i2c_buffer_lock);
 
 	return ((rw[0] << 16) | (rw[1]));
 }
@@ -2445,7 +2462,8 @@ static int dib8000_autosearch_start(struct dvb_frontend *fe)
 	if (state->revision == 0x8090)
 		internal = dib8000_read32(state, 23) / 1000;
 
-	if (state->autosearch_state == AS_SEARCHING_FFT) {
+	if ((state->revision >= 0x8002) &&
+	    (state->autosearch_state == AS_SEARCHING_FFT)) {
 		dib8000_write_word(state,  37, 0x0065); /* P_ctrl_pha_off_max default values */
 		dib8000_write_word(state, 116, 0x0000); /* P_ana_gain to 0 */
 
@@ -2481,7 +2499,8 @@ static int dib8000_autosearch_start(struct dvb_frontend *fe)
 		dib8000_write_word(state, 770, (dib8000_read_word(state, 770) & 0xdfff) | (1 << 13)); /* P_restart_ccg = 1 */
 		dib8000_write_word(state, 770, (dib8000_read_word(state, 770) & 0xdfff) | (0 << 13)); /* P_restart_ccg = 0 */
 		dib8000_write_word(state, 0, (dib8000_read_word(state, 0) & 0x7ff) | (0 << 15) | (1 << 13)); /* P_restart_search = 0; */
-	} else if (state->autosearch_state == AS_SEARCHING_GUARD) {
+	} else if ((state->revision >= 0x8002) &&
+		   (state->autosearch_state == AS_SEARCHING_GUARD)) {
 		c->transmission_mode = TRANSMISSION_MODE_8K;
 		c->guard_interval = GUARD_INTERVAL_1_8;
 		c->inversion = 0;
@@ -2583,7 +2602,8 @@ static int dib8000_autosearch_irq(struct dvb_frontend *fe)
 	struct dib8000_state *state = fe->demodulator_priv;
 	u16 irq_pending = dib8000_read_word(state, 1284);
 
-	if (state->autosearch_state == AS_SEARCHING_FFT) {
+	if ((state->revision >= 0x8002) &&
+	    (state->autosearch_state == AS_SEARCHING_FFT)) {
 		if (irq_pending & 0x1) {
 			dprintk("dib8000_autosearch_irq: max correlation result available");
 			return 3;