We want to make sure SHIM register fields such as SYNCPRD are only
programmed once. Since we don't have a controller-level driver, we
need master-level drivers to collaborate: the registers will only be
programmed when the first link is powered-up.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
drivers/soundwire/intel.h | 2 ++
include/linux/soundwire/sdw_intel.h | 2 ++
2 files changed, 4 insertions(+)
diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index 568c84a80d79..cfc83120b8f9 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -16,6 +16,7 @@
* @ops: Shim callback ops
* @dev: device implementing hw_params and free callbacks
* @shim_lock: mutex to handle access to shared SHIM registers
+ * @shim_mask: global pointer to check SHIM register initialization
*/
struct sdw_intel_link_res {
struct platform_device *pdev;
@@ -27,6 +28,7 @@ struct sdw_intel_link_res {
const struct sdw_intel_ops *ops;
struct device *dev;
struct mutex *shim_lock; /* protect shared registers */
+ u32 *shim_mask;
};
#endif /* __SDW_INTEL_LOCAL_H */
diff --git a/include/linux/soundwire/sdw_intel.h b/include/linux/soundwire/sdw_intel.h
index 979b41b5dcb4..120ffddc03d2 100644
--- a/include/linux/soundwire/sdw_intel.h
+++ b/include/linux/soundwire/sdw_intel.h
@@ -115,6 +115,7 @@ struct sdw_intel_slave_id {
* links
* @link_list: list to handle interrupts across all links
* @shim_lock: mutex to handle concurrent rmw access to shared SHIM registers.
+ * @shim_mask: flags to track initialization of SHIM shared registers
*/
struct sdw_intel_ctx {
int count;
@@ -126,6 +127,7 @@ struct sdw_intel_ctx {
struct sdw_intel_slave_id *ids;
struct list_head link_list;
struct mutex shim_lock; /* lock for access to shared SHIM registers */
+ u32 shim_mask;
};
/**
--
2.20.1
