msm: ipa3: Update channel start as success in flow control state

Observing race condition when we are starting the channel and
modem trying to offload flow_control on same channel. Add changes
to retrun success if channel state is flow control when trying to
start the channel.

Change-Id: Id254cd0e3e17c74e931d27cb96577224559c091e
Signed-off-by: Praveen Kurapati <pkurapat@codeaurora.org>

drivers/platform/msm/gsi/gsi.c

@@ -175,7 +175,8 @@ static void gsi_channel_state_change_wait(unsigned long chan_hdl,
 		}
 
 		if (op == GSI_CH_START) {
-			if (curr_state == GSI_CHAN_STATE_STARTED) {
+			if (curr_state == GSI_CHAN_STATE_STARTED ||
+				curr_state == GSI_CHAN_STATE_FLOW_CONTROL) {
 				ctx->state = curr_state;
 				return;
 			}
@@ -2780,7 +2781,8 @@ int gsi_start_channel(unsigned long chan_hdl)
 		ctx,
 		GSI_START_CMD_TIMEOUT_MS, op);
 
-	if (ctx->state != GSI_CHAN_STATE_STARTED) {
+	if (ctx->state != GSI_CHAN_STATE_STARTED &&
+		ctx->state != GSI_CHAN_STATE_FLOW_CONTROL) {
 		/*
 		* Hardware returned unexpected status, unexpected
 		* hardware state.

drivers/platform/msm/gsi/gsi.h

@@ -90,6 +90,7 @@ enum gsi_chan_state {
 	GSI_CHAN_STATE_STARTED = 0x2,
 	GSI_CHAN_STATE_STOPPED = 0x3,
 	GSI_CHAN_STATE_STOP_IN_PROC = 0x4,
+	GSI_CHAN_STATE_FLOW_CONTROL = 0x5,
 	GSI_CHAN_STATE_ERROR = 0xf
 };