iwlwifi: add very first D0i3 support

When the bus is in D0i3, we can't send regular commands to
the firmware. This means that we need to add a state to
remember what is our d0i3 state and make sure that only
d0i3 exit commands can be sent.
Add flags to CMD_ flags and transport status for this
purpose.

Commands with CMD_HIGH_PRIO set are queued at the head of
the command queue, behind other high priority commands.

Commands with CMD_SEND_IN_IDLE set can be sent while the
transport is idle (without taking rpm reference).

Commands with CMD_MAKE_TRANS_IDLE set indicate that command
completion should mark the transport as idle (and release
the bus).

Commands with CMD_WAKE_UP_TRANS set instruct the transport
to exit from idle when this command is completed.

The transport is marked as idle (STATUS_TRANS_IDLE) when
the FW enters D0i3 state. This bit is cleared when it
enters D0 state again.

Process only commands with CMD_SEND_IN_IDLE flag while the
transport is idle. Other enqueued commands will be
processed only later, right after exiting D0i3.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h
index 1b2ac31d7445..7b19274b550f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans.h
@@ -193,12 +193,23 @@ static inline u32 iwl_rx_packet_payload_len(const struct iwl_rx_packet *pkt)
  * @CMD_ASYNC: Return right away and don't wait for the response
  * @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
  *      response. The caller needs to call iwl_free_resp when done.
+ * @CMD_HIGH_PRIO: The command is high priority - it goes to the front of the
+ *      command queue, but after other high priority commands. valid only
+ *      with CMD_ASYNC.
+ * @CMD_SEND_IN_IDLE: The command should be sent even when the trans is idle.
+ * @CMD_MAKE_TRANS_IDLE: The command response should mark the trans as idle.
+ * @CMD_WAKE_UP_TRANS: The command response should wake up the trans
+ *      (i.e. mark it as non-idle).
  */
 enum CMD_MODE {
         CMD_SYNC                = 0,
         CMD_ASYNC               = BIT(0),
         CMD_WANT_SKB            = BIT(1),
         CMD_SEND_IN_RFKILL      = BIT(2),
+        CMD_HIGH_PRIO           = BIT(3),
+        CMD_SEND_IN_IDLE        = BIT(4),
+        CMD_MAKE_TRANS_IDLE     = BIT(5),
+        CMD_WAKE_UP_TRANS       = BIT(6),
 };
 
 #define DEF_CMD_PAYLOAD_SIZE 320
@@ -335,6 +346,9 @@ enum iwl_d3_status {
  * @STATUS_INT_ENABLED: interrupts are enabled
  * @STATUS_RFKILL: the HW RFkill switch is in KILL position
  * @STATUS_FW_ERROR: the fw is in error state
+ * @STATUS_TRANS_GOING_IDLE: shutting down the trans, only special commands
+ *      are sent
+ * @STATUS_TRANS_IDLE: the trans is idle - general commands are not to be sent
  */
 enum iwl_trans_status {
         STATUS_SYNC_HCMD_ACTIVE,
@@ -343,6 +357,8 @@ enum iwl_trans_status {
         STATUS_INT_ENABLED,
         STATUS_RFKILL,
         STATUS_FW_ERROR,
+        STATUS_TRANS_GOING_IDLE,
+        STATUS_TRANS_IDLE,
 };
 
 /**