cosmetic: Remove "FIXME?" from Odd AMR CMI phase

This default phase of the Codec Mode Indication in downlink direction is
called "odd", which is defined by starting with CMC in every 26
multiframe.

At call set-up, after every successful handover and after a channel mode
modify, the default phase (odd) shall be used in downlink direction.
During a call, the phase of Codec Mode Indication may be changed in
downlink by using a RATSCCH message.

As we don't implement RATSCCH, odd is always correct.

Change-Id: Ia64767fbfdc3fb067d72dbf5eabb1d84e3868ce5
---
M src/osmo-bts-lc15/oml.c
M src/osmo-bts-oc2g/oml.c
M src/osmo-bts-sysmo/oml.c
3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/src/osmo-bts-lc15/oml.c b/src/osmo-bts-lc15/oml.c
index 9057f9d..4847c17 100644
--- a/src/osmo-bts-lc15/oml.c
+++ b/src/osmo-bts-lc15/oml.c
@@ -973,7 +973,9 @@
 	case GSM48_CMODE_SPEECH_AMR:
 		lch_par->tch.tchPlType = GsmL1_TchPlType_Amr;
 		set_payload_format(lch_par);
-		lch_par->tch.amrCmiPhase = GsmL1_AmrCmiPhase_Odd; /* FIXME? */
+		/* At call set-up, after every successful handover and after a channel mode modify, the
+		 * default phase (odd) shall be used in downlink direction. */
+		lch_par->tch.amrCmiPhase = GsmL1_AmrCmiPhase_Odd;
 		lch_par->tch.amrInitCodecMode = amr_get_initial_mode(lchan);
 
 		/* initialize to clean state */
diff --git a/src/osmo-bts-oc2g/oml.c b/src/osmo-bts-oc2g/oml.c
index bcbe92c..233a1f7 100644
--- a/src/osmo-bts-oc2g/oml.c
+++ b/src/osmo-bts-oc2g/oml.c
@@ -988,7 +988,9 @@
 	case GSM48_CMODE_SPEECH_AMR:
 		lch_par->tch.tchPlType = GsmL1_TchPlType_Amr;
 		set_payload_format(lch_par);
-		lch_par->tch.amrCmiPhase = GsmL1_AmrCmiPhase_Odd; /* FIXME? */
+		/* At call set-up, after every successful handover and after a channel mode modify, the
+		 * default phase (odd) shall be used in downlink direction. */
+		 lch_par->tch.amrCmiPhase = GsmL1_AmrCmiPhase_Odd;
 		lch_par->tch.amrInitCodecMode = amr_get_initial_mode(lchan);
 
 		/* initialize to clean state */
diff --git a/src/osmo-bts-sysmo/oml.c b/src/osmo-bts-sysmo/oml.c
index 87b6a9a..653d37d 100644
--- a/src/osmo-bts-sysmo/oml.c
+++ b/src/osmo-bts-sysmo/oml.c
@@ -981,7 +981,9 @@
 	case GSM48_CMODE_SPEECH_AMR:
 		lch_par->tch.tchPlType = GsmL1_TchPlType_Amr;
 		set_payload_format(lch_par);
-		lch_par->tch.amrCmiPhase = GsmL1_AmrCmiPhase_Odd; /* FIXME? */
+		/* At call set-up, after every successful handover and after a channel mode modify, the
+		 * default phase (odd) shall be used in downlink direction. */
+		lch_par->tch.amrCmiPhase = GsmL1_AmrCmiPhase_Odd;
 		lch_par->tch.amrInitCodecMode = amr_get_initial_mode(lchan);
 
 		/* initialize to clean state */

