soundwire: intel: add sync_arm/sync_go to ops

The bus start/stop sequences can be reused between platforms if we add
a couple of new callbacks. In following patches the code will be moved to
a shared file.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230314015410.487311-7-yung-chuan.liao@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/intel.c

@@ -686,7 +686,7 @@ static int intel_pre_bank_switch(struct sdw_intel *sdw)
 	if (!bus->multi_link)
 		return 0;
 
-	intel_shim_sync_arm(sdw);
+	sdw_intel_sync_arm(sdw);
 
 	return 0;
 }
@@ -720,7 +720,7 @@ static int intel_post_bank_switch(struct sdw_intel *sdw)
 		goto unlock;
 	}
 
-	ret = intel_shim_sync_go_unlocked(sdw);
+	ret = sdw_intel_sync_go_unlocked(sdw);
 unlock:
 	mutex_unlock(sdw->link_res->shim_lock);
 
@@ -1140,7 +1140,7 @@ static int intel_start_bus(struct sdw_intel *sdw)
 	 * gsync is enabled
 	 */
 	if (bus->multi_link)
-		intel_shim_sync_arm(sdw);
+		sdw_intel_sync_arm(sdw);
 
 	ret = sdw_cdns_init(cdns);
 	if (ret < 0) {
@@ -1155,7 +1155,7 @@ static int intel_start_bus(struct sdw_intel *sdw)
 	}
 
 	if (bus->multi_link) {
-		ret = intel_shim_sync_go(sdw);
+		ret = sdw_intel_sync_go(sdw);
 		if (ret < 0) {
 			dev_err(dev, "%s: sync go failed: %d\n", __func__, ret);
 			goto err_interrupt;
@@ -1210,7 +1210,7 @@ static int intel_start_bus_after_reset(struct sdw_intel *sdw)
 		 * timeouts when gsync is enabled
 		 */
 		if (bus->multi_link)
-			intel_shim_sync_arm(sdw);
+			sdw_intel_sync_arm(sdw);
 
 		/*
 		 * Re-initialize the IP since it was powered-off
@@ -1239,7 +1239,7 @@ static int intel_start_bus_after_reset(struct sdw_intel *sdw)
 		}
 
 		if (bus->multi_link) {
-			ret = intel_shim_sync_go(sdw);
+			ret = sdw_intel_sync_go(sdw);
 			if (ret < 0) {
 				dev_err(sdw->cdns.dev, "sync go failed during resume\n");
 				goto err_interrupt;
@@ -1342,6 +1342,10 @@ const struct sdw_intel_hw_ops sdw_intel_cnl_hw_ops = {
 
 	.pre_bank_switch = intel_pre_bank_switch,
 	.post_bank_switch = intel_post_bank_switch,
+
+	.sync_arm = intel_shim_sync_arm,
+	.sync_go_unlocked = intel_shim_sync_go_unlocked,
+	.sync_go = intel_shim_sync_go,
 };
 EXPORT_SYMBOL_NS(sdw_intel_cnl_hw_ops, SOUNDWIRE_INTEL);
 

drivers/soundwire/intel.h

@@ -167,4 +167,24 @@ static inline void sdw_intel_shim_wake(struct sdw_intel *sdw, bool wake_enable)
 		SDW_INTEL_OPS(sdw, shim_wake)(sdw, wake_enable);
 }
 
+static inline void sdw_intel_sync_arm(struct sdw_intel *sdw)
+{
+	if (SDW_INTEL_CHECK_OPS(sdw, sync_arm))
+		SDW_INTEL_OPS(sdw, sync_arm)(sdw);
+}
+
+static inline int sdw_intel_sync_go_unlocked(struct sdw_intel *sdw)
+{
+	if (SDW_INTEL_CHECK_OPS(sdw, sync_go_unlocked))
+		return SDW_INTEL_OPS(sdw, sync_go_unlocked)(sdw);
+	return -ENOTSUPP;
+}
+
+static inline int sdw_intel_sync_go(struct sdw_intel *sdw)
+{
+	if (SDW_INTEL_CHECK_OPS(sdw, sync_go))
+		return SDW_INTEL_OPS(sdw, sync_go)(sdw);
+	return -ENOTSUPP;
+}
+
 #endif /* __SDW_INTEL_LOCAL_H */

include/linux/soundwire/sdw_intel.h

@@ -309,6 +309,10 @@ struct sdw_intel;
  * @shim_wake: enable/disable in-band wake management
  * @pre_bank_switch: helper for bus management
  * @post_bank_switch: helper for bus management
+ * @sync_arm: helper for multi-link synchronization
+ * @sync_go_unlocked: helper for multi-link synchronization -
+ * shim_lock is assumed to be locked at higher level
+ * @sync_go: helper for multi-link synchronization
  */
 struct sdw_intel_hw_ops {
 	void (*debugfs_init)(struct sdw_intel *sdw);
@@ -330,6 +334,10 @@ struct sdw_intel_hw_ops {
 
 	int (*pre_bank_switch)(struct sdw_intel *sdw);
 	int (*post_bank_switch)(struct sdw_intel *sdw);
+
+	void (*sync_arm)(struct sdw_intel *sdw);
+	int (*sync_go_unlocked)(struct sdw_intel *sdw);
+	int (*sync_go)(struct sdw_intel *sdw);
 };
 
 extern const struct sdw_intel_hw_ops sdw_intel_cnl_hw_ops;