V4L/DVB (12131): BUGFIX: An incorrect Carrier Recovery Loop optimizat…

…ion table was being

loaded for a given chip version. This would cause the optimization in
tuning not to be applied and thus a failed expectation, in tuning speed
increment. The patch swaps the tables in use. It also fixes a possible
one in a million condition where state->dev_ver implies an older Cut
(Cut < 2.0, eventhough the driver doesn't attach to any Cut older than
2.0) or even negative (due to a bad I2C bus master driver) for the card
combination.

Thanks to Mauro Carvalho Chehab <mchehab@infradead.org> for pointing
out the issue at large.

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/stv090x.c

@@ -2694,10 +2694,13 @@ static u8 stv090x_optimize_carloop_short(struct stv090x_state *state)
 		break;
 	}
 
-	if (state->dev_ver >= 0x30)
-		short_crl = stv090x_s2_short_crl_cut20;
-	else if (state->dev_ver >= 0x20)
+	if (state->dev_ver >= 0x30) {
+		/* Cut 3.0 and up */
 		short_crl = stv090x_s2_short_crl_cut30;
+	} else {
+		/* Cut 2.0 and up: we don't support cuts older than 2.0 */
+		short_crl = stv090x_s2_short_crl_cut20;
+	}
 
 	if (state->srate <= 3000000)
 		aclc = short_crl[index].crl_2;