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soundwire: intel: add CLK_STOP_BUS_RESET support

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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>
Link: https://lore.kernel.org/r/20200817152923.3259-9-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Rander Wang 2020-08-17 23:29:19 +08:00 committed by Vinod Koul
parent a320f41eac
commit 6626a616aa
1 changed files with 44 additions and 0 deletions
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44
drivers/soundwire/intel.c
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@ -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);