Commit caf68819 authored by Pierre-Louis Bossart's avatar Pierre-Louis Bossart Committed by Vinod Koul
Browse files

soundwire: intel: add CLK_STOP_NOT_ALLOWED support 



In case the clock needs to keep running, we need to prevent the Master
from entering pm_runtime suspend.

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/20200817152923.3259-10-yung-chuan.liao@linux.intel.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 6626a616

drivers/soundwire/intel.c

+20 −0
Original line number Diff line number Diff line
@@ -1367,6 +1367,7 @@ int intel_master_startup(struct platform_device *pdev) 
	struct sdw_intel *sdw = cdns_to_intel(cdns);

	struct sdw_bus *bus = &cdns->bus;

	int link_flags;

	u32 clock_stop_quirks;

	int ret;



	if (bus->prop.hw_disabled) {
@@ -1423,6 +1424,20 @@ int intel_master_startup(struct platform_device *pdev) 
		pm_runtime_enable(dev);

	}



	clock_stop_quirks = sdw->link_res->clock_stop_quirks;

	if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {

		/*

		 * To keep the clock running we need to prevent

		 * pm_runtime suspend from happening by increasing the

		 * reference count.

		 * This quirk is specified by the parent PCI device in

		 * case of specific latency requirements. It will have

		 * no effect if pm_runtime is disabled by the user via

		 * a module parameter for testing purposes.

		 */

		pm_runtime_get_noresume(dev);

	}



	/*

	 * The runtime PM status of Slave devices is "Unsupported"

	 * until they report as ATTACHED. If they don't, e.g. because
@@ -1454,6 +1469,11 @@ static int intel_master_remove(struct platform_device *pdev) 
	struct sdw_intel *sdw = cdns_to_intel(cdns);

	struct sdw_bus *bus = &cdns->bus;



	/*

	 * Since pm_runtime is already disabled, we don't decrease

	 * the refcount when the clock_stop_quirk is

	 * SDW_INTEL_CLK_STOP_NOT_ALLOWED

	 */

	if (!bus->prop.hw_disabled) {

		intel_debugfs_exit(sdw);

		sdw_cdns_enable_interrupt(cdns, false);