[PATCH net 3/3] net: ipa: introduce ipa_cmd_tag_process()

[Alex Elder]

Create a new function ipa_cmd_tag_process() that simply allocates a
transaction, adds a tag process command to it to clear the hardware
pipeline, and commits the transaction.

Call it in from ipa_endpoint_suspend(), after suspending the modem
endpoints but before suspending the AP command TX and AP LAN RX
endpoints (which are used by the tag sequence).

Signed-off-by: Alex Elder <el...@linaro.org>
---
 drivers/net/ipa/ipa_cmd.c      | 15 +++++++++++++++
 drivers/net/ipa/ipa_cmd.h      |  8 ++++++++
 drivers/net/ipa/ipa_endpoint.c |  2 ++
 3 files changed, 25 insertions(+)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index c9ab865e7290..d92dd3f09b73 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -586,6 +586,21 @@ u32 ipa_cmd_tag_process_count(void)
        return 4;
 }
 
+void ipa_cmd_tag_process(struct ipa *ipa)
+{
+       u32 count = ipa_cmd_tag_process_count();
+       struct gsi_trans *trans;
+
+       trans = ipa_cmd_trans_alloc(ipa, count);
+       if (trans) {
+               ipa_cmd_tag_process_add(trans);
+               gsi_trans_commit_wait(trans);
+       } else {
+               dev_err(&ipa->pdev->dev,
+                       "error allocating %u entry tag transaction\n", count);
+       }
+}
+
 static struct ipa_cmd_info *
 ipa_cmd_info_alloc(struct ipa_endpoint *endpoint, u32 tre_count)
 {
diff --git a/drivers/net/ipa/ipa_cmd.h b/drivers/net/ipa/ipa_cmd.h
index e440aa69c8b5..1a646e0264a0 100644
--- a/drivers/net/ipa/ipa_cmd.h
+++ b/drivers/net/ipa/ipa_cmd.h
@@ -171,6 +171,14 @@ void ipa_cmd_tag_process_add(struct gsi_trans *trans);
  */
 u32 ipa_cmd_tag_process_count(void);
 
+/**
+ * ipa_cmd_tag_process() - Perform a tag process
+ *
+ * @Return:    The number of elements to allocate in a transaction
+ *             to hold tag process commands
+ */
+void ipa_cmd_tag_process(struct ipa *ipa);
+
 /**
  * ipa_cmd_trans_alloc() - Allocate a transaction for the command TX endpoint
  * @ipa:       IPA pointer
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 9f50d0d11704..9e58e495d373 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1450,6 +1450,8 @@ void ipa_endpoint_suspend(struct ipa *ipa)
        if (ipa->modem_netdev)
                ipa_modem_suspend(ipa->modem_netdev);
 
+       ipa_cmd_tag_process(ipa);
+
        ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);
        ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
 }
-- 
2.25.1