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V4L/DVB (3804): Tweak bandselect setup fox cx24123 

*) Allow forcing the bandselect value with a module parameter to 
facilitate determining the correct bandselect frequencies.
*) Changes the bandselect frequency thresholds based on experiments 
with the above parameter in conjunction with the values in the spec.

Signed-off-by: Yeasah Pell <yeasah at schwide.net>
Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Yeasah Pell 2006-04-13 17:26:22 -03:00 committed by Mauro Carvalho Chehab
parent 0e4558ab4a
commit 70047f9cca
1 changed files with 60 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
drivers/media/dvb/frontends/cx24123.c
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@ -31,6 +31,7 @@
#define XTAL 10111000 #define XTAL 10111000
static int force_band;
static int debug; static int debug;
#define dprintk(args...) \ #define dprintk(args...) \
do { \ do { \
@ -109,65 +110,76 @@ static struct
u32 progdata; u32 progdata;
} cx24123_bandselect_vals[] = } cx24123_bandselect_vals[] =
{ {
/* band 1 */
{ {
.freq_low = 950000, .freq_low = 950000,
.freq_high = 1018999,
.VCOdivider = 4,
.progdata = (0 << 18) | (0 << 9) | 0x40,
},
{
.freq_low = 1019000,
.freq_high = 1074999, .freq_high = 1074999,
.VCOdivider = 4, .VCOdivider = 4,
.progdata = (0 << 18) | (0 << 9) | 0x80, .progdata = (0 << 19) | (0 << 9) | 0x40,
}, },
/* band 2 */
{ {
.freq_low = 1075000, .freq_low = 1075000,
.freq_high = 1227999, .freq_high = 1177999,
.VCOdivider = 2, .VCOdivider = 4,
.progdata = (0 << 18) | (1 << 9) | 0x01, .progdata = (0 << 19) | (0 << 9) | 0x80,
}, },
/* band 3 */
{ {
.freq_low = 1228000, .freq_low = 1178000,
.freq_high = 1349999, .freq_high = 1295999,
.VCOdivider = 2, .VCOdivider = 2,
.progdata = (0 << 18) | (1 << 9) | 0x02, .progdata = (0 << 19) | (1 << 9) | 0x01,
}, },
/* band 4 */
{ {
.freq_low = 1350000, .freq_low = 1296000,
.freq_high = 1481999, .freq_high = 1431999,
.VCOdivider = 2, .VCOdivider = 2,
.progdata = (0 << 18) | (1 << 9) | 0x04, .progdata = (0 << 19) | (1 << 9) | 0x02,
}, },
/* band 5 */
{ {
.freq_low = 1482000, .freq_low = 1432000,
.freq_high = 1595999, .freq_high = 1575999,
.VCOdivider = 2, .VCOdivider = 2,
.progdata = (0 << 18) | (1 << 9) | 0x08, .progdata = (0 << 19) | (1 << 9) | 0x04,
}, },
/* band 6 */
{ {
.freq_low = 1596000, .freq_low = 1576000,
.freq_high = 1717999, .freq_high = 1717999,
.VCOdivider = 2, .VCOdivider = 2,
.progdata = (0 << 18) | (1 << 9) | 0x10, .progdata = (0 << 19) | (1 << 9) | 0x08,
}, },
/* band 7 */
{ {
.freq_low = 1718000, .freq_low = 1718000,
.freq_high = 1855999, .freq_high = 1855999,
.VCOdivider = 2, .VCOdivider = 2,
.progdata = (0 << 18) | (1 << 9) | 0x20, .progdata = (0 << 19) | (1 << 9) | 0x10,
}, },
/* band 8 */
{ {
.freq_low = 1856000, .freq_low = 1856000,
.freq_high = 2035999, .freq_high = 2035999,
.VCOdivider = 2, .VCOdivider = 2,
.progdata = (0 << 18) | (1 << 9) | 0x40, .progdata = (0 << 19) | (1 << 9) | 0x20,
}, },
/* band 9 */
{ {
.freq_low = 2036000, .freq_low = 2036000,
.freq_high = 2149999, .freq_high = 2150000,
.VCOdivider = 2, .VCOdivider = 2,
.progdata = (0 << 18) | (1 << 9) | 0x80, .progdata = (0 << 19) | (1 << 9) | 0x40,
}, },
}; };
@ -520,6 +532,8 @@ static int cx24123_pll_calculate(struct dvb_frontend* fe, struct dvb_frontend_pa
u32 ndiv = 0, adiv = 0, vco_div = 0; u32 ndiv = 0, adiv = 0, vco_div = 0;
int i = 0; int i = 0;
int pump = 2; int pump = 2;
int band = 0;
int num_bands = sizeof(cx24123_bandselect_vals) / sizeof(cx24123_bandselect_vals[0]);
/* Defaults for low freq, low rate */ /* Defaults for low freq, low rate */
state->VCAarg = cx24123_AGC_vals[0].VCAprogdata; state->VCAarg = cx24123_AGC_vals[0].VCAprogdata;
@ -538,21 +552,27 @@ static int cx24123_pll_calculate(struct dvb_frontend* fe, struct dvb_frontend_pa
} }
} }
/* For the given frequency, determine the bandselect programming bits */ /* determine the band to use */
for (i = 0; i < sizeof(cx24123_bandselect_vals) / sizeof(cx24123_bandselect_vals[0]); i++) if(force_band < 1 || force_band > num_bands)
{ {
if ((cx24123_bandselect_vals[i].freq_low <= p->frequency) && for (i = 0; i < num_bands; i++)
(cx24123_bandselect_vals[i].freq_high >= p->frequency) ) { {
state->bandselectarg = cx24123_bandselect_vals[i].progdata; if ((cx24123_bandselect_vals[i].freq_low <= p->frequency) &&
vco_div = cx24123_bandselect_vals[i].VCOdivider; (cx24123_bandselect_vals[i].freq_high >= p->frequency) )
band = i;
/* determine the charge pump current */
if ( p->frequency < (cx24123_bandselect_vals[i].freq_low + cx24123_bandselect_vals[i].freq_high)/2 )
pump = 0x01;
else
pump = 0x02;
} }
} }
else
band = force_band - 1;
state->bandselectarg = cx24123_bandselect_vals[band].progdata;
vco_div = cx24123_bandselect_vals[band].VCOdivider;
/* determine the charge pump current */
if ( p->frequency < (cx24123_bandselect_vals[band].freq_low + cx24123_bandselect_vals[band].freq_high)/2 )
pump = 0x01;
else
pump = 0x02;
/* Determine the N/A dividers for the requested lband freq (in kHz). */ /* Determine the N/A dividers for the requested lband freq (in kHz). */
/* Note: the reference divider R=10, frequency is in KHz, XTAL is in Hz */ /* Note: the reference divider R=10, frequency is in KHz, XTAL is in Hz */
@ -1086,6 +1106,9 @@ static struct dvb_frontend_ops cx24123_ops = {
module_param(debug, int, 0644); module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)"); MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
module_param(force_band, int, 0644);
MODULE_PARM_DESC(force_band, "Force a specific band select (1-9, default:off).");
MODULE_DESCRIPTION("DVB Frontend module for Conexant cx24123/cx24109 hardware"); MODULE_DESCRIPTION("DVB Frontend module for Conexant cx24123/cx24109 hardware");
MODULE_AUTHOR("Steven Toth"); MODULE_AUTHOR("Steven Toth");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");