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-config.h b/drivers/net/wireless/iwlwifi/iwl-config.h
index 456fcca..2ce89d8 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-config.h
+++ b/drivers/net/wireless/iwlwifi/iwl-config.h
@@ -227,6 +227,7 @@ struct iwl_pwr_tx_backoff {
  * @high_temp: Is this NIC is designated to be in high temperature.
  * @host_interrupt_operation_mode: device needs host interrupt operation
  *     mode set
+ * @d0i3: device uses d0i3 instead of d3
  * @nvm_hw_section_num: the ID of the HW NVM section
  * @pwr_tx_backoffs: translation table between power limits and backoffs
  *
@@ -259,6 +260,7 @@ struct iwl_cfg {
        const bool internal_wimax_coex;
        const bool host_interrupt_operation_mode;
        bool high_temp;
+       bool d0i3;
        u8   nvm_hw_section_num;
        const struct iwl_pwr_tx_backoff *pwr_tx_backoffs;
 };

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h
index a350abe..1b2ac31 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans.h
@@ -443,6 +443,11 @@ struct iwl_trans;
  * @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 @@ struct iwl_trans_ops {
                                   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 @@ static inline int iwl_trans_d3_resume(struct iwl_trans *trans,
        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)
 {