soundwire: intel_ace2x: add link power-up/down helpers

only power-up/down for now, the frequency is not set.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230515071042.2038-12-yung-chuan.liao@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/intel_ace2x.c

@@ -10,12 +10,62 @@
 #include <linux/soundwire/sdw_registers.h>
 #include <linux/soundwire/sdw.h>
 #include <linux/soundwire/sdw_intel.h>
+#include <sound/hda-mlink.h>
 #include "cadence_master.h"
 #include "bus.h"
 #include "intel.h"
 
+static int intel_link_power_up(struct sdw_intel *sdw)
+{
+	int ret;
+
+	mutex_lock(sdw->link_res->shim_lock);
+
+	ret = hdac_bus_eml_sdw_power_up_unlocked(sdw->link_res->hbus, sdw->instance);
+	if (ret < 0) {
+		dev_err(sdw->cdns.dev, "%s: hdac_bus_eml_sdw_power_up failed: %d\n",
+			__func__, ret);
+		goto out;
+	}
+
+	sdw->cdns.link_up = true;
+out:
+	mutex_unlock(sdw->link_res->shim_lock);
+
+	return ret;
+}
+
+static int intel_link_power_down(struct sdw_intel *sdw)
+{
+	int ret;
+
+	mutex_lock(sdw->link_res->shim_lock);
+
+	sdw->cdns.link_up = false;
+
+	ret = hdac_bus_eml_sdw_power_down_unlocked(sdw->link_res->hbus, sdw->instance);
+	if (ret < 0) {
+		dev_err(sdw->cdns.dev, "%s: hdac_bus_eml_sdw_power_down failed: %d\n",
+			__func__, ret);
+
+		/*
+		 * we leave the sdw->cdns.link_up flag as false since we've disabled
+		 * the link at this point and cannot handle interrupts any longer.
+		 */
+	}
+
+	mutex_unlock(sdw->link_res->shim_lock);
+
+	return ret;
+}
+
 const struct sdw_intel_hw_ops sdw_intel_lnl_hw_ops = {
 	.debugfs_init = intel_ace2x_debugfs_init,
 	.debugfs_exit = intel_ace2x_debugfs_exit,
+
+	.link_power_up = intel_link_power_up,
+	.link_power_down = intel_link_power_down,
 };
 EXPORT_SYMBOL_NS(sdw_intel_lnl_hw_ops, SOUNDWIRE_INTEL);
+
+MODULE_IMPORT_NS(SND_SOC_SOF_HDA_MLINK);