[PATCH 1/2] soundwire: cadence: add soft-reset on startup

[Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>]

From: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>

Follow the recommended programming flows.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Signed-off-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
---
 drivers/soundwire/cadence_master.c   | 25 +++++++++++++++++++++++++
 drivers/soundwire/cadence_master.h   |  1 +
 drivers/soundwire/intel_bus_common.c |  6 ++++++
 3 files changed, 32 insertions(+)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index 05652e983539..7c8c977a923a 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -1377,6 +1377,31 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
 	cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
 }
 
+/**
+ * sdw_cdns_soft_reset() - Cadence soft-reset
+ * @cdns: Cadence instance
+ */
+int sdw_cdns_soft_reset(struct sdw_cdns *cdns)
+{
+	int ret;
+
+	cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_SOFT_RST,
+		     CDNS_MCP_CONTROL_SOFT_RST);
+
+	ret = cdns_config_update(cdns);
+	if (ret < 0) {
+		dev_err(cdns->dev, "%s: config update failed\n", __func__);
+		return ret;
+	}
+
+	ret = cdns_set_wait(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_SOFT_RST, 0);
+	if (ret < 0)
+		dev_err(cdns->dev, "%s: Soft Reset timed out\n", __func__);
+
+	return ret;
+}
+EXPORT_SYMBOL(sdw_cdns_soft_reset);
+
 /**
  * sdw_cdns_init() - Cadence initialization
  * @cdns: Cadence instance
diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
index e1d7969ba48a..c34fb050fe4f 100644
--- a/drivers/soundwire/cadence_master.h
+++ b/drivers/soundwire/cadence_master.h
@@ -168,6 +168,7 @@ int sdw_cdns_probe(struct sdw_cdns *cdns);
 irqreturn_t sdw_cdns_irq(int irq, void *dev_id);
 irqreturn_t sdw_cdns_thread(int irq, void *dev_id);
 
+int sdw_cdns_soft_reset(struct sdw_cdns *cdns);
 int sdw_cdns_init(struct sdw_cdns *cdns);
 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
 		      struct sdw_cdns_stream_config config);
diff --git a/drivers/soundwire/intel_bus_common.c b/drivers/soundwire/intel_bus_common.c
index d3ff6c65b64c..ad1f8ebdbfc9 100644
--- a/drivers/soundwire/intel_bus_common.c
+++ b/drivers/soundwire/intel_bus_common.c
@@ -16,6 +16,12 @@ int intel_start_bus(struct sdw_intel *sdw)
 	struct sdw_bus *bus = &cdns->bus;
 	int ret;
 
+	ret = sdw_cdns_soft_reset(cdns);
+	if (ret < 0) {
+		dev_err(dev, "%s: unable to soft-reset Cadence IP: %d\n", __func__, ret);
+		return ret;
+	}
+
 	/*
 	 * follow recommended programming flows to avoid timeouts when
 	 * gsync is enabled
-- 
2.43.0