[PATCH v5 21/25] soundwire: amd: replace >= ACP70 with explicit switch/case in PM paths

[Vijendar Mukunda <Vijendar.Mukunda@amd.com>]

Replace open-ended acp_rev >= ACP70_PCI_REV_ID comparisons in
amd_suspend(), amd_suspend_runtime(), and amd_resume_runtime() with
explicit per-revision handling enumerating ACP63, ACP70, ACP71, and
ACP72, so that every supported revision is handled explicitly.

The host wake enable step is guarded by acp_rev at six PM call sites.
Factor that repeated block into amd_sdw_host_wake_enable_by_rev() to
avoid duplicating the switch/case at every site. The remaining device
state transitions keep an inline switch/case as one of them carries
additional PME handling.

An unrecognised revision cannot reach these PM callbacks because
amd_sdw_manager_probe() already validates acp_rev with the same switch
and fails registration for anything unknown. The switch default therefore
emits dev_err() and returns -EINVAL to make the unexpected case visible
while keeping the error path consistent across all PM operations.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
---
 drivers/soundwire/amd_manager.c | 100 +++++++++++++++++++++-----------
 1 file changed, 66 insertions(+), 34 deletions(-)

diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
index b6aa05f5f6c0..2b38b9bf97f5 100644
--- a/drivers/soundwire/amd_manager.c
+++ b/drivers/soundwire/amd_manager.c
@@ -1407,6 +1407,23 @@ static int __maybe_unused amd_pm_prepare(struct device *dev)
 	return 0;
 }
 
+static int __maybe_unused amd_sdw_host_wake_enable_by_rev(struct amd_sdw_manager *amd_manager,
+							  bool enable)
+{
+	switch (amd_manager->acp_rev) {
+	case ACP63_PCI_REV_ID:
+		break;
+	case ACP70_PCI_REV_ID:
+	case ACP71_PCI_REV_ID:
+	case ACP72_PCI_REV_ID:
+		return amd_sdw_host_wake_enable(amd_manager, enable);
+	default:
+		dev_err(amd_manager->dev, "unexpected acp_rev 0x%x\n", amd_manager->acp_rev);
+		return -EINVAL;
+	}
+	return 0;
+}
+
 static int __maybe_unused amd_suspend(struct device *dev)
 {
 	struct amd_sdw_manager *amd_manager = dev_get_drvdata(dev);
@@ -1422,22 +1439,18 @@ static int __maybe_unused amd_suspend(struct device *dev)
 	if (amd_manager->power_mode_mask & AMD_SDW_CLK_STOP_MODE) {
 		cancel_work_sync(&amd_manager->amd_sdw_work);
 		amd_sdw_wake_enable(amd_manager, false);
-		if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
-			ret = amd_sdw_host_wake_enable(amd_manager, false);
-			if (ret)
-				return ret;
-		}
+		ret = amd_sdw_host_wake_enable_by_rev(amd_manager, false);
+		if (ret)
+			return ret;
 		ret = amd_sdw_clock_stop(amd_manager);
 		if (ret)
 			return ret;
 	} else if (amd_manager->power_mode_mask & AMD_SDW_POWER_OFF_MODE) {
 		cancel_work_sync(&amd_manager->amd_sdw_work);
 		amd_sdw_wake_enable(amd_manager, false);
-		if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
-			ret = amd_sdw_host_wake_enable(amd_manager, false);
-			if (ret)
-				return ret;
-		}
+		ret = amd_sdw_host_wake_enable_by_rev(amd_manager, false);
+		if (ret)
+			return ret;
 		/*
 		 * As per hardware programming sequence on AMD platforms,
 		 * clock stop should be invoked first before powering-off
@@ -1455,10 +1468,19 @@ static int __maybe_unused amd_suspend(struct device *dev)
 			amd_manager->pad_fully_torn_down = true;
 		}
 	}
-	if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
+	switch (amd_manager->acp_rev) {
+	case ACP63_PCI_REV_ID:
+		break;
+	case ACP70_PCI_REV_ID:
+	case ACP71_PCI_REV_ID:
+	case ACP72_PCI_REV_ID:
 		ret = amd_sdw_set_device_state(amd_manager, AMD_SDW_DEVICE_STATE_D3);
 		if (ret)
 			return ret;
+		break;
+	default:
+		dev_err(amd_manager->dev, "unexpected acp_rev 0x%x\n", amd_manager->acp_rev);
+		return -EINVAL;
 	}
 	return 0;
 }
@@ -1477,11 +1499,9 @@ static int __maybe_unused amd_suspend_runtime(struct device *dev)
 	}
 	if (amd_manager->power_mode_mask & AMD_SDW_CLK_STOP_MODE) {
 		amd_sdw_wake_enable(amd_manager, true);
-		if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
-			ret = amd_sdw_host_wake_enable(amd_manager, true);
-			if (ret)
-				return ret;
-		}
+		ret = amd_sdw_host_wake_enable_by_rev(amd_manager, true);
+		if (ret)
+			return ret;
 		ret = amd_sdw_clock_stop(amd_manager);
 		if (ret)
 			return ret;
@@ -1494,12 +1514,10 @@ static int __maybe_unused amd_suspend_runtime(struct device *dev)
 		if (ret)
 			return ret;
 		amd_sdw_wake_enable(amd_manager, true);
-		if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
-			ret = amd_sdw_host_wake_enable(amd_manager, true);
-			if (ret)
-				return ret;
-		} else if ((amd_manager->acp_rev == ACP63_PCI_REV_ID) &&
-			   amd_manager->wake_en_mask) {
+		ret = amd_sdw_host_wake_enable_by_rev(amd_manager, true);
+		if (ret)
+			return ret;
+		if (amd_manager->acp_rev == ACP63_PCI_REV_ID && amd_manager->wake_en_mask) {
 			mutex_lock(amd_manager->acp_sdw_lock);
 			val = sdw_manager_reg_mask_array[amd_manager->instance];
 			amd_updatel(amd_manager->acp_mmio,
@@ -1514,7 +1532,12 @@ static int __maybe_unused amd_suspend_runtime(struct device *dev)
 		 */
 		amd_sdw_oe_ctrl(amd_manager, false);
 	}
-	if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
+	switch (amd_manager->acp_rev) {
+	case ACP63_PCI_REV_ID:
+		break;
+	case ACP70_PCI_REV_ID:
+	case ACP71_PCI_REV_ID:
+	case ACP72_PCI_REV_ID:
 		ret = amd_sdw_set_device_state(amd_manager, AMD_SDW_DEVICE_STATE_D3);
 		if (ret)
 			return ret;
@@ -1526,6 +1549,10 @@ static int __maybe_unused amd_suspend_runtime(struct device *dev)
 				dev_dbg(amd_manager->dev, "ACP_PME_EN:0x%x\n", val);
 			}
 		}
+		break;
+	default:
+		dev_err(amd_manager->dev, "unexpected acp_rev 0x%x\n", amd_manager->acp_rev);
+		return -EINVAL;
 	}
 	return 0;
 }
@@ -1547,11 +1574,9 @@ static int __maybe_unused amd_resume_runtime(struct device *dev)
 		ret = amd_sdw_clock_stop_exit(amd_manager);
 		if (ret)
 			return ret;
-		if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
-			ret = amd_sdw_host_wake_enable(amd_manager, false);
-			if (ret)
-				return ret;
-		}
+		ret = amd_sdw_host_wake_enable_by_rev(amd_manager, false);
+		if (ret)
+			return ret;
 	} else if (amd_manager->power_mode_mask & AMD_SDW_POWER_OFF_MODE) {
 		if (amd_manager->pad_fully_torn_down) {
 			amd_sdw_pad_ctrl(amd_manager, true);
@@ -1571,11 +1596,9 @@ static int __maybe_unused amd_resume_runtime(struct device *dev)
 		mutex_lock(&amd_manager->bus.msg_lock);
 		amd_manager->ping_slave_stat = U32_MAX;
 		mutex_unlock(&amd_manager->bus.msg_lock);
-		if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
-			ret = amd_sdw_host_wake_enable(amd_manager, false);
-			if (ret)
-				return ret;
-		}
+		ret = amd_sdw_host_wake_enable_by_rev(amd_manager, false);
+		if (ret)
+			return ret;
 		val = readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
 		if (val) {
 			val |= AMD_SDW_CLK_RESUME_REQ;
@@ -1601,10 +1624,19 @@ static int __maybe_unused amd_resume_runtime(struct device *dev)
 			return ret;
 		amd_sdw_set_frameshape(amd_manager);
 	}
-	if (amd_manager->acp_rev >= ACP70_PCI_REV_ID) {
+	switch (amd_manager->acp_rev) {
+	case ACP63_PCI_REV_ID:
+		break;
+	case ACP70_PCI_REV_ID:
+	case ACP71_PCI_REV_ID:
+	case ACP72_PCI_REV_ID:
 		ret = amd_sdw_set_device_state(amd_manager, AMD_SDW_DEVICE_STATE_D0);
 		if (ret)
 			return ret;
+		break;
+	default:
+		dev_err(amd_manager->dev, "unexpected acp_rev 0x%x\n", amd_manager->acp_rev);
+		return -EINVAL;
 	}
 	return 0;
 }
-- 
2.53.0