iwlwifi: add D0i3 references boiler plate
D0i3 is bus power saving feature. It involves the
firmware - the driver needs to send a list of commands
to the firmware before entering this state. Wake up from
d0i3 also requires a few commands to the firmware.
The trigger to enter D0i3 is an idle timeout that will be
implemented later and will most probably rely on RUNTIME_PM
infrastructure.
In order to prevent entrance to D0i3 in critical flows, we
implement here a reference infrastructure. When a ref is
taken, we can't enter D0i3.
PCIe does't support D0i3.
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h
index a350abe..1b2ac31 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans.h
@@ -443,6 +443,11 @@
* @release_nic_access: let the NIC go to sleep. The "flags" parameter
* must be the same one that was sent before to the grab_nic_access.
* @set_bits_mask - set SRAM register according to value and mask.
+ * @ref: grab a reference to the transport/FW layers, disallowing
+ * certain low power states
+ * @unref: release a reference previously taken with @ref. Note that
+ * initially the reference count is 1, making an initial @unref
+ * necessary to allow low power states.
*/
struct iwl_trans_ops {
@@ -489,6 +494,8 @@
unsigned long *flags);
void (*set_bits_mask)(struct iwl_trans *trans, u32 reg, u32 mask,
u32 value);
+ void (*ref)(struct iwl_trans *trans);
+ void (*unref)(struct iwl_trans *trans);
};
/**
@@ -630,6 +637,18 @@
return trans->ops->d3_resume(trans, status, test);
}
+static inline void iwl_trans_ref(struct iwl_trans *trans)
+{
+ if (trans->ops->ref)
+ trans->ops->ref(trans);
+}
+
+static inline void iwl_trans_unref(struct iwl_trans *trans)
+{
+ if (trans->ops->unref)
+ trans->ops->unref(trans);
+}
+
static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
struct iwl_host_cmd *cmd)
{
