Commit 6626a616 authored by Rander Wang's avatar Rander Wang Committed by Vinod Koul
Browse files

soundwire: intel: add CLK_STOP_BUS_RESET support 



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: default avatarRander Wang <rander.wang@intel.com>
Signed-off-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: default avatarBard 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: default avatarVinod Koul <vkoul@kernel.org>
parent a320f41e

drivers/soundwire/intel.c

+44 −0
Original line number Diff line number Diff line
@@ -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);