From: Rander Wang rander.wang@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.wang@intel.com 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 | 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);