Merge "msm: ipa3: Ring IPA MHI event ring doorbell on channel start"

2 files changed, 47 insertions, 0 deletions

diff --git a/drivers/platform/msm/gsi/gsi.c b/drivers/platform/msm/gsi/gsi.c
index 08bffc344429..b111a5904952 100644
--- a/drivers/platform/msm/gsi/gsi.c
+++ b/drivers/platform/msm/gsi/gsi.c
@@ -1319,6 +1319,35 @@ int gsi_query_evt_ring_db_addr(unsigned long evt_ring_hdl,
 }
 EXPORT_SYMBOL(gsi_query_evt_ring_db_addr);
 
+int gsi_ring_evt_ring_db(unsigned long evt_ring_hdl, uint64_t value)
+{
+	struct gsi_evt_ctx *ctx;
+
+	if (!gsi_ctx) {
+		pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
+		return -GSI_STATUS_NODEV;
+	}
+
+	if (evt_ring_hdl >= gsi_ctx->max_ev) {
+		GSIERR("bad params evt_ring_hdl=%lu\n", evt_ring_hdl);
+		return -GSI_STATUS_INVALID_PARAMS;
+	}
+
+	ctx = &gsi_ctx->evtr[evt_ring_hdl];
+
+	if (ctx->state != GSI_EVT_RING_STATE_ALLOCATED) {
+		GSIERR("bad state %d\n",
+				gsi_ctx->evtr[evt_ring_hdl].state);
+		return -GSI_STATUS_UNSUPPORTED_OP;
+	}
+
+	ctx->ring.wp_local = value;
+	gsi_ring_evt_doorbell(ctx);
+
+	return GSI_STATUS_SUCCESS;
+}
+EXPORT_SYMBOL(gsi_ring_evt_ring_db);
+
 int gsi_reset_evt_ring(unsigned long evt_ring_hdl)
 {
 	uint32_t val;
diff --git a/drivers/platform/msm/ipa/ipa_v3/ipa_mhi.c b/drivers/platform/msm/ipa/ipa_v3/ipa_mhi.c
index 9e2ffe70170c..cd027c28e597 100644
--- a/drivers/platform/msm/ipa/ipa_v3/ipa_mhi.c
+++ b/drivers/platform/msm/ipa/ipa_v3/ipa_mhi.c
@@ -255,6 +255,24 @@ static int ipa_mhi_start_gsi_channel(enum ipa_client_type client,
 		ep->gsi_evt_ring_hdl = *params->cached_gsi_evt_ring_hdl;
 	}
 
+	if (params->ev_ctx_host->wp == params->ev_ctx_host->rbase) {
+		IPA_MHI_ERR("event ring wp is not updated. base=wp=0x%llx\n",
+			params->ev_ctx_host->wp);
+		goto fail_alloc_ch;
+		return res;
+	}
+
+	IPA_MHI_DBG("Ring event db: evt_ring_hdl=%lu host_wp=0x%llx\n",
+		ep->gsi_evt_ring_hdl, params->ev_ctx_host->wp);
+	res = gsi_ring_evt_ring_db(ep->gsi_evt_ring_hdl,
+		params->ev_ctx_host->wp);
+	if (res) {
+		IPA_MHI_ERR("fail to ring evt ring db %d. hdl=%lu wp=0x%llx\n",
+			res, ep->gsi_evt_ring_hdl, params->ev_ctx_host->wp);
+		goto fail_alloc_ch;
+		return res;
+	}
+
 	memset(&ch_props, 0, sizeof(ch_props));
 	ch_props.prot = GSI_CHAN_PROT_MHI;
 	ch_props.dir = IPA_CLIENT_IS_PROD(client) ?