[PATCH v2 04/12] soundwire: intel: call helper to reset Slave states on resume

[Bard Liao <yung-chuan.liao@linux.intel.com>]

From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

This helps make sure they are all UNATTACHED and reset the state
machines.

At the moment we perform a bus reset both for system resume and
pm_runtime resume, this will be modified when clock-stop mode is
supported

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
---
 drivers/soundwire/intel.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 00c5de1250ec..10dd0e208ce7 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1516,6 +1516,12 @@ static int intel_resume(struct device *dev)
 		return ret;
 	}
 
+	/*
+	 * make sure all Slaves are tagged as UNATTACHED and provide
+	 * reason for reinitialization
+	 */
+	sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
+
 	ret = sdw_cdns_enable_interrupt(cdns, true);
 	if (ret < 0) {
 		dev_err(dev, "cannot enable interrupts during resume\n");
@@ -1562,6 +1568,12 @@ static int intel_resume_runtime(struct device *dev)
 		return ret;
 	}
 
+	/*
+	 * make sure all Slaves are tagged as UNATTACHED and provide
+	 * reason for reinitialization
+	 */
+	sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
+
 	ret = sdw_cdns_enable_interrupt(cdns, true);
 	if (ret < 0) {
 		dev_err(dev, "cannot enable interrupts during resume\n");
-- 
2.17.1