mirror of https://gitee.com/openkylin/linux.git
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
Mauro Carvalho Chehab
parent
0e4558ab4a
commit
70047f9cca
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@ -31,6 +31,7 @@
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#define XTAL 10111000
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static int force_band;
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static int debug;
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#define dprintk(args...) \
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do { \
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@ -109,65 +110,76 @@ static struct
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u32 progdata;
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} cx24123_bandselect_vals[] =
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{
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/* band 1 */
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{
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.freq_low = 950000,
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.freq_high = 1018999,
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.VCOdivider = 4,
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.progdata = (0 << 18) | (0 << 9) | 0x40,
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},
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{
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.freq_low = 1019000,
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.freq_high = 1074999,
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.VCOdivider = 4,
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.progdata = (0 << 18) | (0 << 9) | 0x80,
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.progdata = (0 << 19) | (0 << 9) | 0x40,
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},
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/* band 2 */
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{
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.freq_low = 1075000,
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.freq_high = 1227999,
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.VCOdivider = 2,
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.progdata = (0 << 18) | (1 << 9) | 0x01,
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.freq_high = 1177999,
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.VCOdivider = 4,
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.progdata = (0 << 19) | (0 << 9) | 0x80,
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},
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/* band 3 */
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{
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.freq_low = 1228000,
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.freq_high = 1349999,
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.freq_low = 1178000,
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.freq_high = 1295999,
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.VCOdivider = 2,
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.progdata = (0 << 18) | (1 << 9) | 0x02,
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.progdata = (0 << 19) | (1 << 9) | 0x01,
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},
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/* band 4 */
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{
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.freq_low = 1350000,
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.freq_high = 1481999,
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.freq_low = 1296000,
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.freq_high = 1431999,
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.VCOdivider = 2,
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.progdata = (0 << 18) | (1 << 9) | 0x04,
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.progdata = (0 << 19) | (1 << 9) | 0x02,
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},
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/* band 5 */
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{
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.freq_low = 1482000,
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.freq_high = 1595999,
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.freq_low = 1432000,
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.freq_high = 1575999,
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.VCOdivider = 2,
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.progdata = (0 << 18) | (1 << 9) | 0x08,
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.progdata = (0 << 19) | (1 << 9) | 0x04,
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},
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/* band 6 */
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{
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.freq_low = 1596000,
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.freq_low = 1576000,
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.freq_high = 1717999,
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.VCOdivider = 2,
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.progdata = (0 << 18) | (1 << 9) | 0x10,
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.progdata = (0 << 19) | (1 << 9) | 0x08,
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},
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/* band 7 */
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{
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.freq_low = 1718000,
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.freq_high = 1855999,
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.VCOdivider = 2,
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.progdata = (0 << 18) | (1 << 9) | 0x20,
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.progdata = (0 << 19) | (1 << 9) | 0x10,
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},
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/* band 8 */
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{
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.freq_low = 1856000,
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.freq_high = 2035999,
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.VCOdivider = 2,
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.progdata = (0 << 18) | (1 << 9) | 0x40,
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.progdata = (0 << 19) | (1 << 9) | 0x20,
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},
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/* band 9 */
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{
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.freq_low = 2036000,
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.freq_high = 2149999,
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.freq_high = 2150000,
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.VCOdivider = 2,
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.progdata = (0 << 18) | (1 << 9) | 0x80,
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.progdata = (0 << 19) | (1 << 9) | 0x40,
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},
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};
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@ -520,6 +532,8 @@ static int cx24123_pll_calculate(struct dvb_frontend* fe, struct dvb_frontend_pa
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u32 ndiv = 0, adiv = 0, vco_div = 0;
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int i = 0;
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int pump = 2;
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int band = 0;
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int num_bands = sizeof(cx24123_bandselect_vals) / sizeof(cx24123_bandselect_vals[0]);
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/* Defaults for low freq, low rate */
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state->VCAarg = cx24123_AGC_vals[0].VCAprogdata;
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@ -538,21 +552,27 @@ static int cx24123_pll_calculate(struct dvb_frontend* fe, struct dvb_frontend_pa
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}
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}
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/* For the given frequency, determine the bandselect programming bits */
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for (i = 0; i < sizeof(cx24123_bandselect_vals) / sizeof(cx24123_bandselect_vals[0]); i++)
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/* determine the band to use */
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if(force_band < 1 || force_band > num_bands)
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{
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if ((cx24123_bandselect_vals[i].freq_low <= p->frequency) &&
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(cx24123_bandselect_vals[i].freq_high >= p->frequency) ) {
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state->bandselectarg = cx24123_bandselect_vals[i].progdata;
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vco_div = cx24123_bandselect_vals[i].VCOdivider;
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/* determine the charge pump current */
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if ( p->frequency < (cx24123_bandselect_vals[i].freq_low + cx24123_bandselect_vals[i].freq_high)/2 )
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pump = 0x01;
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else
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pump = 0x02;
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for (i = 0; i < num_bands; i++)
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{
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if ((cx24123_bandselect_vals[i].freq_low <= p->frequency) &&
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(cx24123_bandselect_vals[i].freq_high >= p->frequency) )
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band = i;
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}
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}
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else
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band = force_band - 1;
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state->bandselectarg = cx24123_bandselect_vals[band].progdata;
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vco_div = cx24123_bandselect_vals[band].VCOdivider;
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/* determine the charge pump current */
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if ( p->frequency < (cx24123_bandselect_vals[band].freq_low + cx24123_bandselect_vals[band].freq_high)/2 )
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pump = 0x01;
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else
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pump = 0x02;
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/* Determine the N/A dividers for the requested lband freq (in kHz). */
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/* Note: the reference divider R=10, frequency is in KHz, XTAL is in Hz */
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@ -1086,6 +1106,9 @@ static struct dvb_frontend_ops cx24123_ops = {
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
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module_param(force_band, int, 0644);
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MODULE_PARM_DESC(force_band, "Force a specific band select (1-9, default:off).");
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MODULE_DESCRIPTION("DVB Frontend module for Conexant cx24123/cx24109 hardware");
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MODULE_AUTHOR("Steven Toth");
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MODULE_LICENSE("GPL");
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