iwlwifi: mvm: restart firmware recording when no configuration is set

Sometimes the firmware will have a hard coded configuration.
In this case, the driver won't find any configuration
in the firmware file, and it will have to re-start
recording in case it has been stopped. This can't be done
by the configuration host command since there is no such
host command configured. Do that with the registers instead.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/iwl-prph.h

@@ -370,7 +370,6 @@ enum secure_load_status_reg {
 #define MON_BUFF_CYCLE_CNT		(0xa03c48)
 
 #define DBGC_IN_SAMPLE			(0xa03c00)
-#define DBGC_OUT_CTRL			(0xa03c0c)
 
 /* FW chicken bits */
 #define LMPM_CHICK			0xA01FF8

drivers/net/wireless/iwlwifi/mvm/fw.c

@@ -544,6 +544,14 @@ int iwl_mvm_fw_dbg_collect_trig(struct iwl_mvm *mvm,
 	return 0;
 }
 
+static inline void iwl_mvm_restart_early_start(struct iwl_mvm *mvm)
+{
+	if (mvm->cfg->device_family == IWL_DEVICE_FAMILY_7000)
+		iwl_clear_bits_prph(mvm->trans, MON_BUFF_SAMPLE_CTL, 0x100);
+	else
+		iwl_write_prph(mvm->trans, DBGC_IN_SAMPLE, 1);
+}
+
 int iwl_mvm_start_fw_dbg_conf(struct iwl_mvm *mvm, u8 conf_id)
 {
 	u8 *ptr;
@@ -554,6 +562,14 @@ int iwl_mvm_start_fw_dbg_conf(struct iwl_mvm *mvm, u8 conf_id)
 		      "Invalid configuration %d\n", conf_id))
 		return -EINVAL;
 
+	/* EARLY START - firmware's configuration is hard coded */
+	if ((!mvm->fw->dbg_conf_tlv[conf_id] ||
+	     !mvm->fw->dbg_conf_tlv[conf_id]->num_of_hcmds) &&
+	    conf_id == FW_DBG_START_FROM_ALIVE) {
+		iwl_mvm_restart_early_start(mvm);
+		return 0;
+	}
+
 	if (!mvm->fw->dbg_conf_tlv[conf_id])
 		return -EINVAL;
 
@@ -663,6 +679,9 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
 		IWL_ERR(mvm, "Failed to initialize Smart Fifo\n");
 
 	mvm->fw_dbg_conf = FW_DBG_INVALID;
+	/* if we have a destination, assume EARLY START */
+	if (mvm->fw->dbg_dest_tlv)
+		mvm->fw_dbg_conf = FW_DBG_START_FROM_ALIVE;
 	iwl_mvm_start_fw_dbg_conf(mvm, FW_DBG_START_FROM_ALIVE);
 
 	ret = iwl_send_tx_ant_cfg(mvm, iwl_mvm_get_valid_tx_ant(mvm));