Hello. The attached patch adds better shifting and masking of SNR and signal strength to stv0297 frontend. This makes the frontend report more reasonable strength and SNR values to user space. I tested the patch only with my Cablestar 2 so mileage with other cards may vary. Please test and let me know if there is an improvement for other cards as well. Signed-off-by: Antti Seppälä <ajhseppa@xxxxxxxxxxxxxx>
--- v4l-dvb-orig/linux/drivers/media/dvb/frontends/stv0297.c 2007-02-14 10:23:45.000000000 +0200 +++ v4l-dvb-cs2/linux/drivers/media/dvb/frontends/stv0297.c 2007-02-14 10:21:54.000000000 +0200 @@ -356,7 +356,7 @@ u8 STRENGTH[2]; stv0297_readregs(state, 0x41, STRENGTH, 2); - *strength = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0]; + *strength = ~(((STRENGTH[1] & 0x03) << 14) | (STRENGTH[0] << 6) | (STRENGTH[0] & 0x3F)); return 0; } @@ -367,7 +367,7 @@ u8 SNR[2]; stv0297_readregs(state, 0x07, SNR, 2); - *snr = SNR[1] << 8 | SNR[0]; + *snr = ~(((SNR[1] & 0x3F) << 10) | (SNR[0] << 2) | (SNR[0] & 0x3)); return 0; }
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