mhi: mhi_uci: add support for shutdown and system error notification

Add support to handle system error and shutdown
notifications from mhi host.

CRs-Fixed: 1097560
Change-Id: Ied6c907586aa4dc2ed3b1a7c19305877144b3b21
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>

diff --git a/drivers/platform/msm/mhi_uci/mhi_uci.c b/drivers/platform/msm/mhi_uci/mhi_uci.c
index ab3c350..3191ec0 100644 (file)
--- a/drivers/platform/msm/mhi_uci/mhi_uci.c
+++ b/drivers/platform/msm/mhi_uci/mhi_uci.c
@@ -1185,9 +1185,43 @@ static void uci_xfer_cb(struct mhi_cb_info *cb_info)
                mutex_unlock(&chan_attr->chan_lock);
                wake_up(&chan_attr->wq);
                break;
+       case MHI_CB_SYS_ERROR:
+       case MHI_CB_MHI_SHUTDOWN:
        case MHI_CB_MHI_DISABLED:
                uci_log(uci_handle->uci_ipc_log, UCI_DBG_INFO,
-                       "MHI disabled CB received\n");
+                       "MHI disabled CB received 0x%x for chan:%d\n",
+                       cb_info->cb_reason, cb_info->chan);
+
+               chan_attr = (cb_info->chan % 2) ? &uci_handle->in_attr :
+                       &uci_handle->out_attr;
+               mutex_lock(&chan_attr->chan_lock);
+               chan_attr->enabled = false;
+               /* we disable entire handler by grabbing only one lock */
+               uci_handle->enabled = false;
+               mutex_unlock(&chan_attr->chan_lock);
+               wake_up(&chan_attr->wq);
+
+               /*
+                * if it's ctrl channel clear the resource now
+                * otherwise during file close we will release the
+                * resources
+                */
+               if (uci_handle == uci_handle->uci_ctxt->ctrl_client &&
+                   chan_attr == &uci_handle->out_attr) {
+                       struct uci_buf *itr, *tmp;
+
+                       mutex_lock(&chan_attr->chan_lock);
+                       atomic_set(&uci_handle->out_attr.avail_pkts, 0);
+                       atomic_set(&uci_handle->out_pkt_pend_ack, 0);
+                       list_for_each_entry_safe(itr, tmp, &chan_attr->buf_head,
+                                                node) {
+                               list_del(&itr->node);
+                               kfree(itr->data);
+                       }
+                       atomic_set(&uci_handle->completion_ack, 0);
+                       INIT_LIST_HEAD(&uci_handle->out_attr.buf_head);
+                       mutex_unlock(&chan_attr->chan_lock);
+               }
                break;
        case MHI_CB_XFER:
                if (!cb_info->result) {