Explain the SNR for DVB-S.
Google-Bug-Id: 19432272
Change-Id: I567346ad04c24b2d326accdfbf2afa4bad7efc0c
diff --git a/drivers/media/dvb/frontends/dvbsky_m88rs6000.c b/drivers/media/dvb/frontends/dvbsky_m88rs6000.c
index f58bcea..9c5bfe3 100644
--- a/drivers/media/dvb/frontends/dvbsky_m88rs6000.c
+++ b/drivers/media/dvb/frontends/dvbsky_m88rs6000.c
@@ -526,11 +526,11 @@
snr_total += val;
cnt--;
}
- /* TODO(kedong): The following code is based on the formula
- * from data sheet. The formula is basically
- * 10*ln(snr/8)/ln(10). The result SNR seems very low though
- * more reasonable at magnitude level compared to the original
- * setting. Need to double check with vendor on this.
+ /* The following code is based on the formula from data sheet.
+ * The formula is basically 10*ln(snr/8)/ln(10). The result SNR
+ * seems can go up to 14. The real SNR could be large than 14,
+ * but the vendor only supports up to 14. Any value beyond 14
+ * displays as 14.
*/
tmp = (u16)(snr_total/80);
if(tmp > 0){
