[PATCH 11/20] soundwire: intel_ace2x: add link power-up/down helpers

Bard Liao
2023-03-23T05:31:35Z

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>
---
drivers/soundwire/intel_ace2x.c | 50 +++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)

diff --git a/drivers/soundwire/intel_ace2x.c b/drivers/soundwire/intel_ace2x.c
index 1c47bb2adb93..5b6a608e63ba 100644
--- a/drivers/soundwire/intel_ace2x.c
+++ b/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);
--
2.25.1