abis_rsl: fix encoding RSL_IE_IPAC_RTP_CSD_FORMAT

The A-bis/IP RTP CSD Format IR Values need to be shifted by 4 bits
instead of 5. See OsmoBTS Abis Protocol Specification § 5.8.14
RSL_IE_IPAC_RTP_CSD_FORMAT.

Related: https://ftp.osmocom.org/docs/osmo-bts/master/osmobts-abis.pdf
Related: OS#4393
Change-Id: I9ce0b2d9b77eef61a6d4dce417efe4e853217dc5
---
M src/osmo-bsc/abis_rsl.c
1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/src/osmo-bsc/abis_rsl.c b/src/osmo-bsc/abis_rsl.c
index dfe7da9..6370942 100644
--- a/src/osmo-bsc/abis_rsl.c
+++ b/src/osmo-bsc/abis_rsl.c
@@ -2590,18 +2590,18 @@
 	switch (ch_mode_rate->data_rate.t) {
 	case RSL_CMOD_CSD_T_32k0:
 	case RSL_CMOD_CSD_T_29k0:
-		ret |= RSL_IPAC_RTP_CSD_IR_32k << 5;
+		ret |= RSL_IPAC_RTP_CSD_IR_32k << 4;
 		break;
 	case RSL_CMOD_CSD_T_14k4:
 	case RSL_CMOD_CSD_T_9k6:
-		ret |= RSL_IPAC_RTP_CSD_IR_16k << 5;
+		ret |= RSL_IPAC_RTP_CSD_IR_16k << 4;
 		break;
 	case RSL_CMOD_CSD_T_4k8:
 	case RSL_CMOD_CSD_T_2k4:
 	case RSL_CMOD_CSD_T_1k2:
 	case RSL_CMOD_CSD_T_600:
 	case RSL_CMOD_CSD_T_1200_75:
-		ret |= RSL_IPAC_RTP_CSD_IR_8k << 5;
+		ret |= RSL_IPAC_RTP_CSD_IR_8k << 4;
 		break;
 	default:
 		return -EINVAL;
@@ -2622,19 +2622,19 @@
 	case RSL_CMOD_CSD_NTA_14k5_43k5:
 	case RSL_CMOD_CSD_NTA_29k0_43k5:
 	case RSL_CMOD_CSD_NT_43k5:
-		ret |= RSL_IPAC_RTP_CSD_IR_64k << 5;
+		ret |= RSL_IPAC_RTP_CSD_IR_64k << 4;
 		break;
 	case RSL_CMOD_CSD_NTA_29k0_14k5:
 	case RSL_CMOD_CSD_NTA_14k5_29k0:
 	case RSL_CMOD_CSD_NT_28k8:
-		ret |= RSL_IPAC_RTP_CSD_IR_32k << 5;
+		ret |= RSL_IPAC_RTP_CSD_IR_32k << 4;
 		break;
 	case RSL_CMOD_CSD_NT_14k5:
 	case RSL_CMOD_CSD_NT_12k0:
-		ret |= RSL_IPAC_RTP_CSD_IR_16k << 5;
+		ret |= RSL_IPAC_RTP_CSD_IR_16k << 4;
 		break;
 	case RSL_CMOD_CSD_NT_6k0:
-		ret |= RSL_IPAC_RTP_CSD_IR_8k << 5;
+		ret |= RSL_IPAC_RTP_CSD_IR_8k << 4;
 		break;
 	default:
 		return -EINVAL;

