[PATCH] dvb: LGDT3302 QAM256 initialization fix

- Initialize all non mutually exclusive variables
  without regard to the mode selected.
- Do a software reset each time the parameters are
  set, regardless of whether anything changes.
  This may allow an application to recover from a
  hung condition.
- Improved error reporting.
- Removed $Id:$
Signed-off-by: NMac Michaels <wmichaels1@earthlink.net>
Signed-off-by: NMichael Krufky <mkrufky@m1k.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/media/dvb/frontends/lgdt3302.c

 /*
- * $Id: lgdt3302.c,v 1.5 2005/07/07 03:47:15 mkrufky Exp $
- *
  *    Support for LGDT3302 (DViCO FustionHDTV 3 Gold) - VSB/QAM
  *
  *    Copyright (C) 2005 Wilson Michaels <wilsonmichaels@earthlink.net>
@@ -83,6 +81,9 @@ static int i2c_writebytes (struct lgdt3302_state* state,
 
 		if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
 			printk(KERN_WARNING "lgdt3302: %s error (addr %02x <- %02x, err == %i)\n", __FUNCTION__, addr, buf[0], err);
+			if (err < 0)
+				return err;
+			else
 				return -EREMOTEIO;
 		}
 	} else {
@@ -96,6 +97,9 @@ static int i2c_writebytes (struct lgdt3302_state* state,
 			tmp[1] = buf[i];
 			if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
 				printk(KERN_WARNING "lgdt3302: %s error (addr %02x <- %02x, err == %i)\n", __FUNCTION__, addr, buf[0], err);
+				if (err < 0)
+					return err;
+				else
 					return -EREMOTEIO;
 			}
 			tmp[0]++;
@@ -218,6 +222,8 @@ static int lgdt3302_set_parameters(struct dvb_frontend* fe,
 
 	/* Change only if we are actually changing the modulation */
 	if (state->current_modulation != param->u.vsb.modulation) {
+		int value;
+
 		switch(param->u.vsb.modulation) {
 		case VSB_8:
 			dprintk("%s: VSB_8 MODE\n", __FUNCTION__);
@@ -266,17 +272,12 @@ static int lgdt3302_set_parameters(struct dvb_frontend* fe,
 		i2c_writebytes(state, state->config->demod_address,
 			       demux_ctrl_cfg, sizeof(demux_ctrl_cfg));
 
-		if (param->u.vsb.modulation == VSB_8) {
-			/* Initialization for VSB modes only */
-			/* Change the value of NCOCTFV[25:0]of carrier
-			   recovery center frequency register for VSB */
+		/* Change the value of NCOCTFV[25:0] of carrier
+		   recovery center frequency register */
 		i2c_writebytes(state, state->config->demod_address,
 				       vsb_freq_cfg, sizeof(vsb_freq_cfg));
-		} else {
-			/* Initialization for QAM modes only */
 		/* Set the value of 'INLVTHD' register 0x2a/0x2c
 		   to value from 'IFACC' register 0x39/0x3b -1 */
-			int value;
 		i2c_selectreadbytes(state, AGC_RFIF_ACC0,
 				    &agc_delay_cfg[1], 3);
 		value = ((agc_delay_cfg[1] & 0x0f) << 8) | agc_delay_cfg[3];
@@ -292,10 +293,8 @@ static int lgdt3302_set_parameters(struct dvb_frontend* fe,
 		   of inner AGC loop filter bandwith */
 		i2c_writebytes(state, state->config->demod_address,
 			       agc_loop_cfg, sizeof(agc_loop_cfg));
-		}
 
 		state->config->set_ts_params(fe, 0);
-		lgdt3302_SwReset(state);
 		state->current_modulation = param->u.vsb.modulation;
 	}
 
@@ -311,11 +310,10 @@ static int lgdt3302_set_parameters(struct dvb_frontend* fe,
 		i2c_readbytes(state, state->config->pll_address, buf, 1);
 		dprintk("%s: tuner status byte = 0x%02x\n", __FUNCTION__, buf[0]);
 
-		lgdt3302_SwReset(state);
-
 		/* Update current frequency */
 		state->current_frequency = param->frequency;
 	}
+	lgdt3302_SwReset(state);
 	return 0;
 }