From: Rander Wang <rander.w...@intel.com>
Move existing pm_runtime suspend under the CLK_STOP_TEARDOWN case.
In this mode the Master IP will lose all context but in-band wakes are
supported.
On pm_runtime resume a complete re-enumeration will be performed after
a bus reset.
Signed-off-by: Rander Wang <rander.w...@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.boss...@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.l...@linux.intel.com>
---
drivers/soundwire/intel.c | 44 +++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 68c1cdfb7999..ad476e9e4d25 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1575,6 +1575,26 @@ static int intel_suspend_runtime(struct device *dev)
intel_shim_wake(sdw, false);
+ } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
+ ret = sdw_cdns_clock_stop(cdns, true);
+ if (ret < 0) {
+ dev_err(dev, "cannot enable clock stop on suspend\n");
+ return ret;
+ }
+
+ ret = sdw_cdns_enable_interrupt(cdns, false);
+ if (ret < 0) {
+ dev_err(dev, "cannot disable interrupts on suspend\n");
+ return ret;
+ }
+
+ ret = intel_link_power_down(sdw);
+ if (ret) {
+ dev_err(dev, "Link power down failed: %d", ret);
+ return ret;
+ }
+
+ intel_shim_wake(sdw, true);
} else {
dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
__func__, clock_stop_quirks);
@@ -1691,6 +1711,30 @@ static int intel_resume_runtime(struct device *dev)
dev_err(dev, "unable to exit bus reset sequence during
resume\n");
return ret;
}
+ } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
+ ret = intel_init(sdw);
+ if (ret) {
+ dev_err(dev, "%s failed: %d", __func__, ret);
+ 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");
+ return ret;
+ }
+
+ ret = sdw_cdns_clock_restart(cdns, true);
+ if (ret < 0) {
+ dev_err(dev, "unable to restart clock during resume\n");
+ return ret;
+ }
} else {
dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
__func__, clock_stop_quirks);
--
2.17.1
