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path: root/drivers/slimbus/messaging.c
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Diffstat (limited to 'drivers/slimbus/messaging.c')
-rw-r--r--drivers/slimbus/messaging.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/drivers/slimbus/messaging.c b/drivers/slimbus/messaging.c
index 031e67648d7c..755462a4c75e 100644
--- a/drivers/slimbus/messaging.c
+++ b/drivers/slimbus/messaging.c
@@ -4,6 +4,7 @@
*/
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include "slimbus.h"
/**
@@ -46,6 +47,10 @@ void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 len)
memcpy(msg->rbuf, reply, len);
if (txn->comp)
complete(txn->comp);
+
+ /* Remove runtime-pm vote now that response was received for TID txn */
+ pm_runtime_mark_last_busy(ctrl->dev);
+ pm_runtime_put_autosuspend(ctrl->dev);
}
EXPORT_SYMBOL_GPL(slim_msg_response);
@@ -65,10 +70,29 @@ EXPORT_SYMBOL_GPL(slim_msg_response);
int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
{
DECLARE_COMPLETION_ONSTACK(done);
- bool need_tid;
+ bool need_tid = false, clk_pause_msg = false;
unsigned long flags;
int ret, tid, timeout;
+ /*
+ * do not vote for runtime-PM if the transactions are part of clock
+ * pause sequence
+ */
+ if (ctrl->sched.clk_state == SLIM_CLK_ENTERING_PAUSE &&
+ (txn->mt == SLIM_MSG_MT_CORE &&
+ txn->mc >= SLIM_MSG_MC_BEGIN_RECONFIGURATION &&
+ txn->mc <= SLIM_MSG_MC_RECONFIGURE_NOW))
+ clk_pause_msg = true;
+
+ if (!clk_pause_msg) {
+ ret = pm_runtime_get_sync(ctrl->dev);
+ if (ctrl->sched.clk_state != SLIM_CLK_ACTIVE) {
+ dev_err(ctrl->dev, "ctrl wrong state:%d, ret:%d\n",
+ ctrl->sched.clk_state, ret);
+ goto slim_xfer_err;
+ }
+ }
+
need_tid = slim_tid_txn(txn->mt, txn->mc);
if (need_tid) {
@@ -107,6 +131,15 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
dev_err(ctrl->dev, "Tx:MT:0x%x, MC:0x%x, LA:0x%x failed:%d\n",
txn->mt, txn->mc, txn->la, ret);
+slim_xfer_err:
+ if (!clk_pause_msg && (!need_tid || ret == -ETIMEDOUT)) {
+ /*
+ * remove runtime-pm vote if this was TX only, or
+ * if there was error during this transaction
+ */
+ pm_runtime_mark_last_busy(ctrl->dev);
+ pm_runtime_mark_last_busy(ctrl->dev);
+ }
return ret;
}
EXPORT_SYMBOL_GPL(slim_do_transfer);