ath11k: mhi: remove state machine

State machines are difficult to understand and in this case it's just useless,
which is shown by the diffstat. So remove it entirely to make the code simpler.

No functional changes.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03003-QCAHSPSWPL_V1_V2_SILICONZ_LITE-2

Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220401173042.17467-2-kvalo@kernel.org

3 files changed, 11 insertions, 198 deletions

diff --git a/drivers/net/wireless/ath/ath11k/mhi.c b/drivers/net/wireless/ath/ath11k/mhi.c
index 1aa1e0f01b85..6ad91c600d0e 100644
--- a/drivers/net/wireless/ath/ath11k/mhi.c
+++ b/drivers/net/wireless/ath/ath11k/mhi.c
@@ -463,195 +463,17 @@ void ath11k_mhi_unregister(struct ath11k_pci *ab_pci)
 	mhi_free_controller(mhi_ctrl);
 }
 
-static char *ath11k_mhi_state_to_str(enum ath11k_mhi_state mhi_state)
-{
-	switch (mhi_state) {
-	case ATH11K_MHI_INIT:
-		return "INIT";
-	case ATH11K_MHI_DEINIT:
-		return "DEINIT";
-	case ATH11K_MHI_POWER_ON:
-		return "POWER_ON";
-	case ATH11K_MHI_POWER_OFF:
-		return "POWER_OFF";
-	case ATH11K_MHI_FORCE_POWER_OFF:
-		return "FORCE_POWER_OFF";
-	case ATH11K_MHI_SUSPEND:
-		return "SUSPEND";
-	case ATH11K_MHI_RESUME:
-		return "RESUME";
-	case ATH11K_MHI_TRIGGER_RDDM:
-		return "TRIGGER_RDDM";
-	case ATH11K_MHI_RDDM_DONE:
-		return "RDDM_DONE";
-	default:
-		return "UNKNOWN";
-	}
-};
-
-static void ath11k_mhi_set_state_bit(struct ath11k_pci *ab_pci,
-				     enum ath11k_mhi_state mhi_state)
-{
-	struct ath11k_base *ab = ab_pci->ab;
-
-	switch (mhi_state) {
-	case ATH11K_MHI_INIT:
-		set_bit(ATH11K_MHI_INIT, &ab_pci->mhi_state);
-		break;
-	case ATH11K_MHI_DEINIT:
-		clear_bit(ATH11K_MHI_INIT, &ab_pci->mhi_state);
-		break;
-	case ATH11K_MHI_POWER_ON:
-		set_bit(ATH11K_MHI_POWER_ON, &ab_pci->mhi_state);
-		break;
-	case ATH11K_MHI_POWER_OFF:
-	case ATH11K_MHI_FORCE_POWER_OFF:
-		clear_bit(ATH11K_MHI_POWER_ON, &ab_pci->mhi_state);
-		clear_bit(ATH11K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state);
-		clear_bit(ATH11K_MHI_RDDM_DONE, &ab_pci->mhi_state);
-		break;
-	case ATH11K_MHI_SUSPEND:
-		set_bit(ATH11K_MHI_SUSPEND, &ab_pci->mhi_state);
-		break;
-	case ATH11K_MHI_RESUME:
-		clear_bit(ATH11K_MHI_SUSPEND, &ab_pci->mhi_state);
-		break;
-	case ATH11K_MHI_TRIGGER_RDDM:
-		set_bit(ATH11K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state);
-		break;
-	case ATH11K_MHI_RDDM_DONE:
-		set_bit(ATH11K_MHI_RDDM_DONE, &ab_pci->mhi_state);
-		break;
-	default:
-		ath11k_err(ab, "unhandled mhi state (%d)\n", mhi_state);
-	}
-}
-
-static int ath11k_mhi_check_state_bit(struct ath11k_pci *ab_pci,
-				      enum ath11k_mhi_state mhi_state)
-{
-	struct ath11k_base *ab = ab_pci->ab;
-
-	switch (mhi_state) {
-	case ATH11K_MHI_INIT:
-		if (!test_bit(ATH11K_MHI_INIT, &ab_pci->mhi_state))
-			return 0;
-		break;
-	case ATH11K_MHI_DEINIT:
-	case ATH11K_MHI_POWER_ON:
-		if (test_bit(ATH11K_MHI_INIT, &ab_pci->mhi_state) &&
-		    !test_bit(ATH11K_MHI_POWER_ON, &ab_pci->mhi_state))
-			return 0;
-		break;
-	case ATH11K_MHI_FORCE_POWER_OFF:
-		if (test_bit(ATH11K_MHI_POWER_ON, &ab_pci->mhi_state))
-			return 0;
-		break;
-	case ATH11K_MHI_POWER_OFF:
-	case ATH11K_MHI_SUSPEND:
-		if (test_bit(ATH11K_MHI_POWER_ON, &ab_pci->mhi_state) &&
-		    !test_bit(ATH11K_MHI_SUSPEND, &ab_pci->mhi_state))
-			return 0;
-		break;
-	case ATH11K_MHI_RESUME:
-		if (test_bit(ATH11K_MHI_SUSPEND, &ab_pci->mhi_state))
-			return 0;
-		break;
-	case ATH11K_MHI_TRIGGER_RDDM:
-		if (test_bit(ATH11K_MHI_POWER_ON, &ab_pci->mhi_state) &&
-		    !test_bit(ATH11K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state))
-			return 0;
-		break;
-	case ATH11K_MHI_RDDM_DONE:
-		return 0;
-	default:
-		ath11k_err(ab, "unhandled mhi state: %s(%d)\n",
-			   ath11k_mhi_state_to_str(mhi_state), mhi_state);
-	}
-
-	ath11k_err(ab, "failed to set mhi state %s(%d) in current mhi state (0x%lx)\n",
-		   ath11k_mhi_state_to_str(mhi_state), mhi_state,
-		   ab_pci->mhi_state);
-
-	return -EINVAL;
-}
-
-static int ath11k_mhi_set_state(struct ath11k_pci *ab_pci,
-				enum ath11k_mhi_state mhi_state)
-{
-	struct ath11k_base *ab = ab_pci->ab;
-	int ret;
-
-	ret = ath11k_mhi_check_state_bit(ab_pci, mhi_state);
-	if (ret)
-		goto out;
-
-	ath11k_dbg(ab, ATH11K_DBG_PCI, "setting mhi state: %s(%d)\n",
-		   ath11k_mhi_state_to_str(mhi_state), mhi_state);
-
-	switch (mhi_state) {
-	case ATH11K_MHI_INIT:
-		ret = mhi_prepare_for_power_up(ab_pci->mhi_ctrl);
-		break;
-	case ATH11K_MHI_DEINIT:
-		mhi_unprepare_after_power_down(ab_pci->mhi_ctrl);
-		ret = 0;
-		break;
-	case ATH11K_MHI_POWER_ON:
-		ret = mhi_sync_power_up(ab_pci->mhi_ctrl);
-		break;
-	case ATH11K_MHI_POWER_OFF:
-		mhi_power_down(ab_pci->mhi_ctrl, true);
-		ret = 0;
-		break;
-	case ATH11K_MHI_FORCE_POWER_OFF:
-		mhi_power_down(ab_pci->mhi_ctrl, false);
-		ret = 0;
-		break;
-	case ATH11K_MHI_SUSPEND:
-		ret = mhi_pm_suspend(ab_pci->mhi_ctrl);
-		break;
-	case ATH11K_MHI_RESUME:
-		/* Do force MHI resume as some devices like QCA6390, WCN6855
-		 * are not in M3 state but they are functional. So just ignore
-		 * the MHI state while resuming.
-		 */
-		ret = mhi_pm_resume_force(ab_pci->mhi_ctrl);
-		break;
-	case ATH11K_MHI_TRIGGER_RDDM:
-		ret = mhi_force_rddm_mode(ab_pci->mhi_ctrl);
-		break;
-	case ATH11K_MHI_RDDM_DONE:
-		break;
-	default:
-		ath11k_err(ab, "unhandled MHI state (%d)\n", mhi_state);
-		ret = -EINVAL;
-	}
-
-	if (ret)
-		goto out;
-
-	ath11k_mhi_set_state_bit(ab_pci, mhi_state);
-
-	return 0;
-
-out:
-	ath11k_err(ab, "failed to set mhi state: %s(%d)\n",
-		   ath11k_mhi_state_to_str(mhi_state), mhi_state);
-	return ret;
-}
-
 int ath11k_mhi_start(struct ath11k_pci *ab_pci)
 {
 	int ret;
 
 	ab_pci->mhi_ctrl->timeout_ms = MHI_TIMEOUT_DEFAULT_MS;
 
-	ret = ath11k_mhi_set_state(ab_pci, ATH11K_MHI_INIT);
+	ret = mhi_prepare_for_power_up(ab_pci->mhi_ctrl);
 	if (ret)
 		goto out;
 
-	ret = ath11k_mhi_set_state(ab_pci, ATH11K_MHI_POWER_ON);
+	ret = mhi_sync_power_up(ab_pci->mhi_ctrl);
 	if (ret)
 		goto out;
 
@@ -663,16 +485,20 @@ out:
 
 void ath11k_mhi_stop(struct ath11k_pci *ab_pci)
 {
-	ath11k_mhi_set_state(ab_pci, ATH11K_MHI_POWER_OFF);
-	ath11k_mhi_set_state(ab_pci, ATH11K_MHI_DEINIT);
+	mhi_power_down(ab_pci->mhi_ctrl, true);
+	mhi_unprepare_after_power_down(ab_pci->mhi_ctrl);
 }
 
 void ath11k_mhi_suspend(struct ath11k_pci *ab_pci)
 {
-	ath11k_mhi_set_state(ab_pci, ATH11K_MHI_SUSPEND);
+	mhi_pm_suspend(ab_pci->mhi_ctrl);
 }
 
 void ath11k_mhi_resume(struct ath11k_pci *ab_pci)
 {
-	ath11k_mhi_set_state(ab_pci, ATH11K_MHI_RESUME);
+	/* Do force MHI resume as some devices like QCA6390, WCN6855
+	 * are not in M3 state but they are functional. So just ignore
+	 * the MHI state while resuming.
+	 */
+	mhi_pm_resume_force(ab_pci->mhi_ctrl);
 }
diff --git a/drivers/net/wireless/ath/ath11k/mhi.h b/drivers/net/wireless/ath/ath11k/mhi.h
index 488dada5d31c..5dd024f879c4 100644
--- a/drivers/net/wireless/ath/ath11k/mhi.h
+++ b/drivers/net/wireless/ath/ath11k/mhi.h
@@ -16,19 +16,6 @@
 #define MHICTRL					0x38
 #define MHICTRL_RESET_MASK			0x2
 
-enum ath11k_mhi_state {
-	ATH11K_MHI_INIT,
-	ATH11K_MHI_DEINIT,
-	ATH11K_MHI_POWER_ON,
-	ATH11K_MHI_POWER_OFF,
-	ATH11K_MHI_FORCE_POWER_OFF,
-	ATH11K_MHI_SUSPEND,
-	ATH11K_MHI_RESUME,
-	ATH11K_MHI_TRIGGER_RDDM,
-	ATH11K_MHI_RDDM,
-	ATH11K_MHI_RDDM_DONE,
-};
-
 int ath11k_mhi_start(struct ath11k_pci *ar_pci);
 void ath11k_mhi_stop(struct ath11k_pci *ar_pci);
 int ath11k_mhi_register(struct ath11k_pci *ar_pci);
diff --git a/drivers/net/wireless/ath/ath11k/pci.h b/drivers/net/wireless/ath/ath11k/pci.h
index 16a000b9cc5e..e9a01f344ec6 100644
--- a/drivers/net/wireless/ath/ath11k/pci.h
+++ b/drivers/net/wireless/ath/ath11k/pci.h
@@ -63,7 +63,7 @@ struct ath11k_pci {
 	u16 dev_id;
 	char amss_path[100];
 	struct mhi_controller *mhi_ctrl;
-	unsigned long mhi_state;
+	const struct ath11k_msi_config *msi_config;
 	u32 register_window;
 
 	/* protects register_window above */