[PATCH 5/5] cx22702: Simplify cx22702_set_tps()

Jean Delvare
2010-09-10T13:36:44Z

Code in function cx22702_set_tps() can be slightly simplified.
Apparently gcc was smart enough to optimize it anyway, but it can't
hurt to make the code more readable.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Steven Toth <stoth@kernellabs.com>
---
drivers/media/dvb/frontends/cx22702.c | 58 ++++++++++++++-------------------
1 file changed, 26 insertions(+), 32 deletions(-)

--- linux-2.6.32-rc5.orig/drivers/media/dvb/frontends/cx22702.c 2009-10-17 14:50:42.000000000 +0200
+++ linux-2.6.32-rc5/drivers/media/dvb/frontends/cx22702.c 2009-10-17 16:12:39.000000000 +0200
@@ -316,33 +316,31 @@ static int cx22702_set_tps(struct dvb_fr
}

/* manually programmed values */
- val = 0;
- switch (p->u.ofdm.constellation) {
+ switch (p->u.ofdm.constellation) { /* mask 0x18 */
case QPSK:
- val = (val & 0xe7);
+ val = 0x00;
break;
case QAM_16:
- val = (val & 0xe7) | 0x08;
+ val = 0x08;
break;
case QAM_64:
- val = (val & 0xe7) | 0x10;
+ val = 0x10;
break;
default:
dprintk("%s: invalid constellation\n", __func__);
return -EINVAL;
}
- switch (p->u.ofdm.hierarchy_information) {
+ switch (p->u.ofdm.hierarchy_information) { /* mask 0x07 */
case HIERARCHY_NONE:
- val = (val & 0xf8);
break;
case HIERARCHY_1:
- val = (val & 0xf8) | 1;
+ val |= 0x01;
break;
case HIERARCHY_2:
- val = (val & 0xf8) | 2;
+ val |= 0x02;
break;
case HIERARCHY_4:
- val = (val & 0xf8) | 3;
+ val |= 0x03;
break;
default:
dprintk("%s: invalid hierarchy\n", __func__);
@@ -350,44 +348,42 @@ static int cx22702_set_tps(struct dvb_fr
}
cx22702_writereg(state, 0x06, val);

- val = 0;
- switch (p->u.ofdm.code_rate_HP) {
+ switch (p->u.ofdm.code_rate_HP) { /* mask 0x38 */
case FEC_NONE:
case FEC_1_2:
- val = (val & 0xc7);
+ val = 0x00;
break;
case FEC_2_3:
- val = (val & 0xc7) | 0x08;
+ val = 0x08;
break;
case FEC_3_4:
- val = (val & 0xc7) | 0x10;
+ val = 0x10;
break;
case FEC_5_6:
- val = (val & 0xc7) | 0x18;
+ val = 0x18;
break;
case FEC_7_8:
- val = (val & 0xc7) | 0x20;
+ val = 0x20;
break;
default:
dprintk("%s: invalid code_rate_HP\n", __func__);
return -EINVAL;
}
- switch (p->u.ofdm.code_rate_LP) {
+ switch (p->u.ofdm.code_rate_LP) { /* mask 0x07 */
case FEC_NONE:
case FEC_1_2:
- val = (val & 0xf8);
break;
case FEC_2_3:
- val = (val & 0xf8) | 1;
+ val |= 0x01;
break;
case FEC_3_4:
- val = (val & 0xf8) | 2;
+ val |= 0x02;
break;
case FEC_5_6:
- val = (val & 0xf8) | 3;
+ val |= 0x03;
break;
case FEC_7_8:
- val = (val & 0xf8) | 4;
+ val |= 0x04;
break;
default:
dprintk("%s: invalid code_rate_LP\n", __func__);
@@ -395,30 +391,28 @@ static int cx22702_set_tps(struct dvb_fr
}
cx22702_writereg(state, 0x07, val);

- val = 0;
- switch (p->u.ofdm.guard_interval) {
+ switch (p->u.ofdm.guard_interval) { /* mask 0x0c */
case GUARD_INTERVAL_1_32:
- val = (val & 0xf3);
+ val = 0x00;
break;
case GUARD_INTERVAL_1_16:
- val = (val & 0xf3) | 0x04;
+ val = 0x04;
break;
case GUARD_INTERVAL_1_8:
- val = (val & 0xf3) | 0x08;
+ val = 0x08;
break;
case GUARD_INTERVAL_1_4:
- val = (val & 0xf3) | 0x0c;
+ val = 0x0c;
break;
default:
dprintk("%s: invalid guard_interval\n", __func__);
return -EINVAL;
}
- switch (p->u.ofdm.transmission_mode) {
+ switch (p->u.ofdm.transmission_mode) { /* mask 0x03 */
case TRANSMISSION_MODE_2K:
- val = (val & 0xfc);
break;
case TRANSMISSION_MODE_8K:
- val = (val & 0xfc) | 1;
+ val |= 0x1;
break;
default:
dprintk("%s: invalid transmission_mode\n", __func__);

--
Jean Delvare