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2024-01-04 1543e317f1da31b75942316931e8f491a8920811 
 kernel/drivers/media/dvb-frontends/mb86a20s.c
....@@ -1,17 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  *   Fujitu mb86a20s ISDB-T/ISDB-Tsb Module driver
34  *
45  *   Copyright (C) 2010-2013 Mauro Carvalho Chehab
56  *   Copyright (C) 2009-2010 Douglas Landgraf <dougsland@redhat.com>
6
- *
7
- *   This program is free software; you can redistribute it and/or
8
- *   modify it under the terms of the GNU General Public License as
9
- *   published by the Free Software Foundation version 2.
10
- *
11
- *   This program is distributed in the hope that it will be useful,
12
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- *   General Public License for more details.
157  */
168 
179 #include <linux/kernel.h>
....@@ -525,7 +517,7 @@
525517  * Estimates the bit rate using the per-segment bit rate given by
526518  * ABNT/NBR 15601 spec (table 4).
527519  */
528
-static u32 isdbt_rate[3][5][4] = {
520
+static const u32 isdbt_rate[3][5][4] = {
529521 	{	/* DQPSK/QPSK */
530522 		{  280850,  312060,  330420,  340430 },	/* 1/2 */
531523 		{  374470,  416080,  440560,  453910 },	/* 2/3 */
....@@ -547,13 +539,9 @@
547539 	}
548540 };
549541 
550
-static void mb86a20s_layer_bitrate(struct dvb_frontend *fe, u32 layer,
551
-				   u32 modulation, u32 forward_error_correction,
552
-				   u32 guard_interval,
553
-				   u32 segment)
542
+static u32 isdbt_layer_min_bitrate(struct dtv_frontend_properties *c,
543
+				   u32 layer)
554544 {
555
-	struct mb86a20s_state *state = fe->demodulator_priv;
556
-	u32 rate;
557545 	int mod, fec, guard;
558546 
559547 	/*
....@@ -561,7 +549,7 @@
561549 	 * to consider the lowest bit rate, to avoid taking too long time
562550 	 * to get BER.
563551 	 */
564
-	switch (modulation) {
552
+	switch (c->layer[layer].modulation) {
565553 	case DQPSK:
566554 	case QPSK:
567555 	default:
....@@ -575,7 +563,7 @@
575563 		break;
576564 	}
577565 
578
-	switch (forward_error_correction) {
566
+	switch (c->layer[layer].fec) {
579567 	default:
580568 	case FEC_1_2:
581569 	case FEC_AUTO:
....@@ -595,7 +583,7 @@
595583 		break;
596584 	}
597585 
598
-	switch (guard_interval) {
586
+	switch (c->guard_interval) {
599587 	default:
600588 	case GUARD_INTERVAL_1_4:
601589 		guard = 0;
....@@ -611,29 +599,14 @@
611599 		break;
612600 	}
613601 
614
-	/* Samples BER at BER_SAMPLING_RATE seconds */
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-	rate = isdbt_rate[mod][fec][guard] * segment * BER_SAMPLING_RATE;
616
-
617
-	/* Avoids sampling too quickly or to overflow the register */
618
-	if (rate < 256)
619
-		rate = 256;
620
-	else if (rate > (1 << 24) - 1)
621
-		rate = (1 << 24) - 1;
622
-
623
-	dev_dbg(&state->i2c->dev,
624
-		"%s: layer %c bitrate: %d kbps; counter = %d (0x%06x)\n",
625
-		__func__, 'A' + layer,
626
-		segment * isdbt_rate[mod][fec][guard]/1000,
627
-		rate, rate);
628
-
629
-	state->estimated_rate[layer] = rate;
602
+	return isdbt_rate[mod][fec][guard] * c->layer[layer].segment_count;
630603 }
631604 
632605 static int mb86a20s_get_frontend(struct dvb_frontend *fe)
633606 {
634607 	struct mb86a20s_state *state = fe->demodulator_priv;
635608 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
636
-	int layer, rc;
609
+	int layer, rc, rate, counter;
637610 
638611 	dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
639612 
....@@ -684,10 +657,21 @@
684657 		dev_dbg(&state->i2c->dev, "%s: interleaving %d.\n",
685658 			__func__, rc);
686659 		c->layer[layer].interleaving = rc;
687
-		mb86a20s_layer_bitrate(fe, layer, c->layer[layer].modulation,
688
-				       c->layer[layer].fec,
689
-				       c->guard_interval,
690
-				       c->layer[layer].segment_count);
660
+
661
+		rate = isdbt_layer_min_bitrate(c, layer);
662
+		counter = rate * BER_SAMPLING_RATE;
663
+
664
+		/* Avoids sampling too quickly or to overflow the register */
665
+		if (counter < 256)
666
+			counter = 256;
667
+		else if (counter > (1 << 24) - 1)
668
+			counter = (1 << 24) - 1;
669
+
670
+		dev_dbg(&state->i2c->dev,
671
+			"%s: layer %c bitrate: %d kbps; counter = %d (0x%06x)\n",
672
+			__func__, 'A' + layer, rate / 1000, counter, counter);
673
+
674
+		state->estimated_rate[layer] = counter;
691675 	}
692676 
693677 	rc = mb86a20s_writereg(state, 0x6d, 0x84);
....@@ -2097,7 +2081,7 @@
20972081 	dev_info(&i2c->dev, "Detected a Fujitsu mb86a20s frontend\n");
20982082 	return &state->frontend;
20992083 }
2100
-EXPORT_SYMBOL(mb86a20s_attach);
2084
+EXPORT_SYMBOL_GPL(mb86a20s_attach);
21012085 
21022086 static const struct dvb_frontend_ops mb86a20s_ops = {
21032087 	.delsys = { SYS_ISDBT },